10kHz to 225MHz VFO/RF Generator with Si5351 - Version 2

For use in DIY homebrew radio equipment such superheterodyne single/double conversion receiver, SDR, HAM QRP transceivers or RF generator.

Feb 28, 2021

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Components and supplies

Capacitor 10 µF

Inductor 100 uH

Toggle Switch, SPDT

RCA JACK FOR RF OUTPUT CONECTION

Capacitor 100 nF

Adafruit SSD1306 128X64 OLED DISPLAY

Capacitor 10 nF

Breadboard (generic)

Adafruit SI5351 CLOCK GEN MODULE

Resistor 1k ohm

Arduino Nano R3

Rotary Encoder with Push-Button

Apps and platforms

Arduino IDE

Project description

Code

Sketch SI5351_VFO_RF_GEN_OLED_JCR_V2

c_cpp

Load it to Arduino.

1/**********************************************************************************************************
2
3  10kHz to 225MHz VFO / RF Generator with Si5351 and Arduino Nano, with Intermediate
4  Frequency (IF) offset
5  (+ or -), RX/TX Selector for QRP Transceivers, Band Presets
6  and Bargraph S-Meter. See the schematics for
7  wiring and README.txt for details.
8  By J. CesarSound - ver 2.0 - Feb/2021.
9***********************************************************************************************************/
10
11//Libraries
12#include
13  <Wire.h>                 //IDE Standard
14#include <Rotary.h>               //Ben
15  Buxton https://github.com/brianlow/Rotary
16#include <si5351.h>               //Etherkit
17  https://github.com/etherkit/Si5351Arduino
18#include <Adafruit_GFX.h>         //Adafruit
19  GFX https://github.com/adafruit/Adafruit-GFX-Library
20#include <Adafruit_SSD1306.h>
21     //Adafruit SSD1306 https://github.com/adafruit/Adafruit_SSD1306
22
23//User
24  preferences
25//------------------------------------------------------------------------------------------------------------
26#define
27  IF         455       //Enter your IF frequency, ex: 455 = 455kHz, 10700 = 10.7MHz,
28  0 = to direct convert receiver or RF generator, + will add and - will subtract IF
29  offfset.
30#define BAND_INIT  7         //Enter your initial Band (1-21) at startup,
31  ex: 1 = Freq Generator, 2 = 800kHz (MW), 7 = 7.2MHz (40m), 11 = 14.1MHz (20m). 
32#define
33  XT_CAL_F   33000     //Si5351 calibration factor, adjust to get exatcly 10MHz. Increasing
34  this value will decreases the frequency and vice versa.
35#define S_GAIN     303
36       //Adjust the sensitivity of Signal Meter A/D input: 101 = 500mv; 202 = 1v;
37  303 = 1.5v; 404 = 2v; 505 = 2.5v; 1010 = 5v (max).
38#define tunestep   A0        //The
39  pin used by tune step push button.
40#define band       A1        //The pin used
41  by band selector push button.
42#define rx_tx      A2        //The pin used by
43  RX / TX selector switch, RX = switch open, TX = switch closed to GND. When in TX,
44  the IF value is not considered.
45#define adc        A3        //The pin used by
46  Signal Meter A/D input.
47//------------------------------------------------------------------------------------------------------------
48
49Rotary
50  r = Rotary(2, 3);
51Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);
52Si5351
53  si5351(0x60); //Si5351 I2C Address 0x60
54
55unsigned long freq, freqold, fstep;
56long
57  interfreq = IF, interfreqold = 0;
58long cal = XT_CAL_F;
59unsigned int smval;
60byte
61  encoder = 1;
62byte stp, n = 1;
63byte count, x, xo;
64bool sts = 0;
65unsigned
66  int period = 100;
67unsigned long time_now = 0;
68
69ISR(PCINT2_vect) {
70  char
71  result = r.process();
72  if (result == DIR_CW) set_frequency(1);
73  else if
74  (result == DIR_CCW) set_frequency(-1);
75}
76
77void set_frequency(short dir)
78  {
79  if (encoder == 1) {                         //Up/Down frequency
80    if
81  (dir == 1) freq = freq + fstep;
82    if (freq >= 225000000) freq = 225000000;
83
84    if (dir == -1) freq = freq - fstep;
85    if (fstep == 1000000 && freq <= 1000000)
86  freq = 1000000;
87    else if (freq < 10000) freq = 10000;
88  }
89  if (encoder
90  == 1) {                       //Up/Down graph tune pointer
91    if (dir == 1)
92  n = n + 1;
93    if (n > 42) n = 1;
94    if (dir == -1) n = n - 1;
95    if
96  (n < 1) n = 42;
97  }
98}
99
100void setup() {
101  Wire.begin();
102  display.begin(SSD1306_SWITCHCAPVCC,
103  0x3C);
104  display.clearDisplay();
105  display.setTextColor(WHITE);
106  display.display();
107
108
109  pinMode(2, INPUT_PULLUP);
110  pinMode(3, INPUT_PULLUP);
111  pinMode(tunestep,
112  INPUT_PULLUP);
113  pinMode(band, INPUT_PULLUP);
114  pinMode(rx_tx, INPUT_PULLUP);
115
116
117  //statup_text();  //If you hang on startup, comment
118
119  si5351.init(SI5351_CRYSTAL_LOAD_8PF,
120  0, 0);
121  si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
122  si5351.drive_strength(SI5351_CLK0,
123  SI5351_DRIVE_8MA);
124  si5351.output_enable(SI5351_CLK0, 1);                  //1
125  - Enable / 0 - Disable CLK
126  si5351.output_enable(SI5351_CLK1, 0);
127  si5351.output_enable(SI5351_CLK2,
128  0);
129
130  PCICR |= (1 << PCIE2);
131  PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);
132
133  sei();
134
135  count = BAND_INIT;
136  bandpresets();
137  stp = 4;
138  setstep();
139}
140
141void
142  loop() {
143  if (freqold != freq) {
144    time_now = millis();
145    tunegen();
146
147    freqold = freq;
148  }
149
150  if (interfreqold != interfreq) {
151    time_now
152  = millis();
153    tunegen();
154    interfreqold = interfreq;
155  }
156
157  if
158  (xo != x) {
159    time_now = millis();
160    xo = x;
161  }
162
163  if (digitalRead(tunestep)
164  == LOW) {
165    time_now = (millis() + 300);
166    setstep();
167    delay(300);
168
169  }
170
171  if (digitalRead(band) == LOW) {
172    time_now = (millis() + 300);
173
174    inc_preset();
175    delay(300);
176  }
177
178  if (digitalRead(rx_tx) == LOW)
179  {
180    time_now = (millis() + 300);
181    sts = 1;
182  } else sts = 0;
183
184
185  if ((time_now + period) > millis()) {
186    displayfreq();
187    layout();
188
189  }
190  sgnalread();
191}
192
193void tunegen() {
194  si5351.set_freq((freq +
195  (interfreq * 1000ULL)) * 100ULL, SI5351_CLK0);
196}
197
198void displayfreq() {
199
200  unsigned int m = freq / 1000000;
201  unsigned int k = (freq % 1000000) / 1000;
202
203  unsigned int h = (freq % 1000) / 1;
204
205  display.clearDisplay();
206  display.setTextSize(2);
207
208
209  char buffer[15] = "";
210  if (m < 1) {
211    display.setCursor(41, 1); sprintf(buffer,
212  "%003d.%003d", k, h);
213  }
214  else if (m < 100) {
215    display.setCursor(5,
216  1); sprintf(buffer, "%2d.%003d.%003d", m, k, h);
217  }
218  else if (m >= 100)
219  {
220    unsigned int h = (freq % 1000) / 10;
221    display.setCursor(5, 1); sprintf(buffer,
222  "%2d.%003d.%02d", m, k, h);
223  }
224  display.print(buffer);
225}
226
227void
228  setstep() {
229  switch (stp) {
230    case 1: stp = 2; fstep = 1; break;
231    case
232  2: stp = 3; fstep = 10; break;
233    case 3: stp = 4; fstep = 1000; break;
234
235    case 4: stp = 5; fstep = 5000; break;
236    case 5: stp = 6; fstep = 10000;
237  break;
238    case 6: stp = 1; fstep = 1000000; break;
239  }
240}
241
242void inc_preset()
243  {
244  count++;
245  if (count > 21) count = 1;
246  bandpresets();
247  delay(50);
248}
249
250void
251  bandpresets() {
252  switch (count)  {
253    case 1: freq = 100000; tunegen();
254  break;
255    case 2: freq = 800000; break;
256    case 3: freq = 1800000; break;
257
258    case 4: freq = 3650000; break;
259    case 5: freq = 4985000; break;
260    case
261  6: freq = 6180000; break;
262    case 7: freq = 7200000; break;
263    case 8: freq
264  = 10000000; break;
265    case 9: freq = 11780000; break;
266    case 10: freq =
267  13630000; break;
268    case 11: freq = 14100000; break;
269    case 12: freq =
270  15000000; break;
271    case 13: freq = 17655000; break;
272    case 14: freq =
273  21525000; break;
274    case 15: freq = 27015000; break;
275    case 16: freq =
276  28400000; break;
277    case 17: freq = 50000000; break;
278    case 18: freq =
279  100000000; break;
280    case 19: freq = 130000000; break;
281    case 20: freq
282  = 144000000; break;
283    case 21: freq = 220000000; break;
284  }
285  si5351.pll_reset(SI5351_PLLA);
286
287  stp = 4; setstep();
288}
289
290void layout() {
291  display.setTextColor(WHITE);
292
293  display.drawLine(0, 20, 127, 20, WHITE);
294  display.drawLine(0, 43, 127, 43,
295  WHITE);
296  display.drawLine(105, 24, 105, 39, WHITE);
297  display.drawLine(87,
298  24, 87, 39, WHITE);
299  display.drawLine(87, 48, 87, 63, WHITE);
300  display.drawLine(15,
301  55, 82, 55, WHITE);
302  display.setTextSize(1);
303  display.setCursor(59, 23);
304
305  display.print("STEP");
306  display.setCursor(54, 33);
307  if (stp == 2) display.print("
308  1Hz"); if (stp == 3) display.print(" 10Hz"); if (stp == 4) display.print("
309  1kHz");
310  if (stp == 5) display.print(" 5kHz"); if (stp == 6) display.print("10kHz");
311  if (stp == 1) display.print(" 1MHz");
312  display.setTextSize(1);
313  display.setCursor(92,
314  48);
315  display.print("IF:");
316  display.setCursor(92, 57);
317  display.print(interfreq);
318
319  display.print("k");
320  display.setTextSize(1);
321  display.setCursor(110,
322  23);
323  if (freq < 1000000) display.print("kHz");
324  if (freq >= 1000000)
325  display.print("MHz");
326  display.setCursor(110, 33);
327  if (interfreq == 0)
328  display.print("VFO");
329  if (interfreq != 0) display.print("L O");
330  display.setCursor(91,
331  28);
332  if (!sts) display.print("RX"); if (!sts) interfreq = IF;
333  if (sts)
334  display.print("TX"); if (sts) interfreq = 0;
335  bandlist(); drawbargraph();
336
337  display.display();
338}
339
340void bandlist() {
341  display.setTextSize(2);
342
343  display.setCursor(0, 25);
344  if (count == 1) display.print("GEN"); if (count
345  == 2) display.print("MW"); if (count == 3) display.print("160m"); if (count
346  == 4) display.print("80m");
347  if (count == 5) display.print("60m"); if (count
348  == 6) display.print("49m"); if (count == 7) display.print("40m"); if (count
349  == 8) display.print("31m");
350  if (count == 9) display.print("25m"); if (count
351  == 10) display.print("22m"); if (count == 11) display.print("20m"); if (count
352  == 12) display.print("19m");
353  if (count == 13) display.print("16m"); if
354  (count == 14) display.print("13m"); if (count == 15) display.print("11m"); if
355  (count == 16) display.print("10m");
356  if (count == 17) display.print("6m");
357  if (count == 18) display.print("WFM"); if (count == 19) display.print("AIR");
358  if (count == 20) display.print("2m");
359  if (count == 21) display.print("1m");
360
361  if (count == 1) interfreq = 0; else if (!sts) interfreq = IF;
362}
363
364void
365  sgnalread() {
366  smval = analogRead(adc); x = map(smval, 0, S_GAIN, 1, 14); if
367  (x > 14) x = 14;
368}
369
370void drawbargraph() {
371  byte y = map(n, 1, 42, 1,
372  14);
373  display.setTextSize(1);
374
375  //Pointer
376  display.setCursor(0, 48);
377  display.print("TU");
378  switch (y) {
379    case 1: display.fillRect(15, 48,
380  2, 6, WHITE); break;
381    case 2: display.fillRect(20, 48, 2, 6, WHITE); break;
382
383    case 3: display.fillRect(25, 48, 2, 6, WHITE); break;
384    case 4: display.fillRect(30,
385  48, 2, 6, WHITE); break;
386    case 5: display.fillRect(35, 48, 2, 6, WHITE); break;
387
388    case 6: display.fillRect(40, 48, 2, 6, WHITE); break;
389    case 7: display.fillRect(45,
390  48, 2, 6, WHITE); break;
391    case 8: display.fillRect(50, 48, 2, 6, WHITE); break;
392
393    case 9: display.fillRect(55, 48, 2, 6, WHITE); break;
394    case 10: display.fillRect(60,
395  48, 2, 6, WHITE); break;
396    case 11: display.fillRect(65, 48, 2, 6, WHITE);
397  break;
398    case 12: display.fillRect(70, 48, 2, 6, WHITE); break;
399    case
400  13: display.fillRect(75, 48, 2, 6, WHITE); break;
401    case 14: display.fillRect(80,
402  48, 2, 6, WHITE); break;
403  }
404
405  //Bargraph
406  display.setCursor(0, 57);
407  display.print("SM");
408  switch (x) {
409    case 14: display.fillRect(80, 58,
410  2, 6, WHITE);
411    case 13: display.fillRect(75, 58, 2, 6, WHITE);
412    case
413  12: display.fillRect(70, 58, 2, 6, WHITE);
414    case 11: display.fillRect(65,
415  58, 2, 6, WHITE);
416    case 10: display.fillRect(60, 58, 2, 6, WHITE);
417    case
418  9: display.fillRect(55, 58, 2, 6, WHITE);
419    case 8: display.fillRect(50, 58,
420  2, 6, WHITE);
421    case 7: display.fillRect(45, 58, 2, 6, WHITE);
422    case
423  6: display.fillRect(40, 58, 2, 6, WHITE);
424    case 5: display.fillRect(35, 58,
425  2, 6, WHITE);
426    case 4: display.fillRect(30, 58, 2, 6, WHITE);
427    case
428  3: display.fillRect(25, 58, 2, 6, WHITE);
429    case 2: display.fillRect(20, 58,
430  2, 6, WHITE);
431    case 1: display.fillRect(15, 58, 2, 6, WHITE);
432  }
433}
434
435void
436  statup_text() {
437  display.setTextSize(1); display.setCursor(13, 18);
438  display.print("Si5351
439  VFO/RF GEN");
440  display.setCursor(6, 40);
441  display.print("JCR RADIO - Ver
442  2.0");
443  display.display(); delay(2000);
444}

/**********************************************************************************************************

  10kHz to 225MHz VFO / RF Generator with Si5351 and Arduino Nano, with Intermediate
  Frequency (IF) offset
  (+ or -), RX/TX Selector for QRP Transceivers, Band Presets
  and Bargraph S-Meter. See the schematics for
  wiring and README.txt for details.
  By J. CesarSound - ver 2.0 - Feb/2021.
***********************************************************************************************************/

//Libraries
#include
  <Wire.h>                 //IDE Standard
#include <Rotary.h>               //Ben
  Buxton https://github.com/brianlow/Rotary
#include <si5351.h>               //Etherkit
  https://github.com/etherkit/Si5351Arduino
#include <Adafruit_GFX.h>         //Adafruit
  GFX https://github.com/adafruit/Adafruit-GFX-Library
#include <Adafruit_SSD1306.h>
     //Adafruit SSD1306 https://github.com/adafruit/Adafruit_SSD1306

//User
  preferences
//------------------------------------------------------------------------------------------------------------
#define
  IF         455       //Enter your IF frequency, ex: 455 = 455kHz, 10700 = 10.7MHz,
  0 = to direct convert receiver or RF generator, + will add and - will subtract IF
  offfset.
#define BAND_INIT  7         //Enter your initial Band (1-21) at startup,
  ex: 1 = Freq Generator, 2 = 800kHz (MW), 7 = 7.2MHz (40m), 11 = 14.1MHz (20m). 
#define
  XT_CAL_F   33000     //Si5351 calibration factor, adjust to get exatcly 10MHz. Increasing
  this value will decreases the frequency and vice versa.
#define S_GAIN     303
       //Adjust the sensitivity of Signal Meter A/D input: 101 = 500mv; 202 = 1v;
  303 = 1.5v; 404 = 2v; 505 = 2.5v; 1010 = 5v (max).
#define tunestep   A0        //The
  pin used by tune step push button.
#define band       A1        //The pin used
  by band selector push button.
#define rx_tx      A2        //The pin used by
  RX / TX selector switch, RX = switch open, TX = switch closed to GND. When in TX,
  the IF value is not considered.
#define adc        A3        //The pin used by
  Signal Meter A/D input.
//------------------------------------------------------------------------------------------------------------

Rotary
  r = Rotary(2, 3);
Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);
Si5351
  si5351(0x60); //Si5351 I2C Address 0x60

unsigned long freq, freqold, fstep;
long
  interfreq = IF, interfreqold = 0;
long cal = XT_CAL_F;
unsigned int smval;
byte
  encoder = 1;
byte stp, n = 1;
byte count, x, xo;
bool sts = 0;
unsigned
  int period = 100;
unsigned long time_now = 0;

ISR(PCINT2_vect) {
  char
  result = r.process();
  if (result == DIR_CW) set_frequency(1);
  else if
  (result == DIR_CCW) set_frequency(-1);
}

void set_frequency(short dir)
  {
  if (encoder == 1) {                         //Up/Down frequency
    if
  (dir == 1) freq = freq + fstep;
    if (freq >= 225000000) freq = 225000000;

    if (dir == -1) freq = freq - fstep;
    if (fstep == 1000000 && freq <= 1000000)
  freq = 1000000;
    else if (freq < 10000) freq = 10000;
  }
  if (encoder
  == 1) {                       //Up/Down graph tune pointer
    if (dir == 1)
  n = n + 1;
    if (n > 42) n = 1;
    if (dir == -1) n = n - 1;
    if
  (n < 1) n = 42;
  }
}

void setup() {
  Wire.begin();
  display.begin(SSD1306_SWITCHCAPVCC,
  0x3C);
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.display();


  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(tunestep,
  INPUT_PULLUP);
  pinMode(band, INPUT_PULLUP);
  pinMode(rx_tx, INPUT_PULLUP);


  //statup_text();  //If you hang on startup, comment

  si5351.init(SI5351_CRYSTAL_LOAD_8PF,
  0, 0);
  si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
  si5351.drive_strength(SI5351_CLK0,
  SI5351_DRIVE_8MA);
  si5351.output_enable(SI5351_CLK0, 1);                  //1
  - Enable / 0 - Disable CLK
  si5351.output_enable(SI5351_CLK1, 0);
  si5351.output_enable(SI5351_CLK2,
  0);

  PCICR |= (1 << PCIE2);
  PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);

  sei();

  count = BAND_INIT;
  bandpresets();
  stp = 4;
  setstep();
}

void
  loop() {
  if (freqold != freq) {
    time_now = millis();
    tunegen();

    freqold = freq;
  }

  if (interfreqold != interfreq) {
    time_now
  = millis();
    tunegen();
    interfreqold = interfreq;
  }

  if
  (xo != x) {
    time_now = millis();
    xo = x;
  }

  if (digitalRead(tunestep)
  == LOW) {
    time_now = (millis() + 300);
    setstep();
    delay(300);

  }

  if (digitalRead(band) == LOW) {
    time_now = (millis() + 300);

    inc_preset();
    delay(300);
  }

  if (digitalRead(rx_tx) == LOW)
  {
    time_now = (millis() + 300);
    sts = 1;
  } else sts = 0;


  if ((time_now + period) > millis()) {
    displayfreq();
    layout();

  }
  sgnalread();
}

void tunegen() {
  si5351.set_freq((freq +
  (interfreq * 1000ULL)) * 100ULL, SI5351_CLK0);
}

void displayfreq() {

  unsigned int m = freq / 1000000;
  unsigned int k = (freq % 1000000) / 1000;

  unsigned int h = (freq % 1000) / 1;

  display.clearDisplay();
  display.setTextSize(2);


  char buffer[15] = "";
  if (m < 1) {
    display.setCursor(41, 1); sprintf(buffer,
  "%003d.%003d", k, h);
  }
  else if (m < 100) {
    display.setCursor(5,
  1); sprintf(buffer, "%2d.%003d.%003d", m, k, h);
  }
  else if (m >= 100)
  {
    unsigned int h = (freq % 1000) / 10;
    display.setCursor(5, 1); sprintf(buffer,
  "%2d.%003d.%02d", m, k, h);
  }
  display.print(buffer);
}

void
  setstep() {
  switch (stp) {
    case 1: stp = 2; fstep = 1; break;
    case
  2: stp = 3; fstep = 10; break;
    case 3: stp = 4; fstep = 1000; break;

    case 4: stp = 5; fstep = 5000; break;
    case 5: stp = 6; fstep = 10000;
  break;
    case 6: stp = 1; fstep = 1000000; break;
  }
}

void inc_preset()
  {
  count++;
  if (count > 21) count = 1;
  bandpresets();
  delay(50);
}

void
  bandpresets() {
  switch (count)  {
    case 1: freq = 100000; tunegen();
  break;
    case 2: freq = 800000; break;
    case 3: freq = 1800000; break;

    case 4: freq = 3650000; break;
    case 5: freq = 4985000; break;
    case
  6: freq = 6180000; break;
    case 7: freq = 7200000; break;
    case 8: freq
  = 10000000; break;
    case 9: freq = 11780000; break;
    case 10: freq =
  13630000; break;
    case 11: freq = 14100000; break;
    case 12: freq =
  15000000; break;
    case 13: freq = 17655000; break;
    case 14: freq =
  21525000; break;
    case 15: freq = 27015000; break;
    case 16: freq =
  28400000; break;
    case 17: freq = 50000000; break;
    case 18: freq =
  100000000; break;
    case 19: freq = 130000000; break;
    case 20: freq
  = 144000000; break;
    case 21: freq = 220000000; break;
  }
  si5351.pll_reset(SI5351_PLLA);

  stp = 4; setstep();
}

void layout() {
  display.setTextColor(WHITE);

  display.drawLine(0, 20, 127, 20, WHITE);
  display.drawLine(0, 43, 127, 43,
  WHITE);
  display.drawLine(105, 24, 105, 39, WHITE);
  display.drawLine(87,
  24, 87, 39, WHITE);
  display.drawLine(87, 48, 87, 63, WHITE);
  display.drawLine(15,
  55, 82, 55, WHITE);
  display.setTextSize(1);
  display.setCursor(59, 23);

  display.print("STEP");
  display.setCursor(54, 33);
  if (stp == 2) display.print("
  1Hz"); if (stp == 3) display.print(" 10Hz"); if (stp == 4) display.print("
  1kHz");
  if (stp == 5) display.print(" 5kHz"); if (stp == 6) display.print("10kHz");
  if (stp == 1) display.print(" 1MHz");
  display.setTextSize(1);
  display.setCursor(92,
  48);
  display.print("IF:");
  display.setCursor(92, 57);
  display.print(interfreq);

  display.print("k");
  display.setTextSize(1);
  display.setCursor(110,
  23);
  if (freq < 1000000) display.print("kHz");
  if (freq >= 1000000)
  display.print("MHz");
  display.setCursor(110, 33);
  if (interfreq == 0)
  display.print("VFO");
  if (interfreq != 0) display.print("L O");
  display.setCursor(91,
  28);
  if (!sts) display.print("RX"); if (!sts) interfreq = IF;
  if (sts)
  display.print("TX"); if (sts) interfreq = 0;
  bandlist(); drawbargraph();

  display.display();
}

void bandlist() {
  display.setTextSize(2);

  display.setCursor(0, 25);
  if (count == 1) display.print("GEN"); if (count
  == 2) display.print("MW"); if (count == 3) display.print("160m"); if (count
  == 4) display.print("80m");
  if (count == 5) display.print("60m"); if (count
  == 6) display.print("49m"); if (count == 7) display.print("40m"); if (count
  == 8) display.print("31m");
  if (count == 9) display.print("25m"); if (count
  == 10) display.print("22m"); if (count == 11) display.print("20m"); if (count
  == 12) display.print("19m");
  if (count == 13) display.print("16m"); if
  (count == 14) display.print("13m"); if (count == 15) display.print("11m"); if
  (count == 16) display.print("10m");
  if (count == 17) display.print("6m");
  if (count == 18) display.print("WFM"); if (count == 19) display.print("AIR");
  if (count == 20) display.print("2m");
  if (count == 21) display.print("1m");

  if (count == 1) interfreq = 0; else if (!sts) interfreq = IF;
}

void
  sgnalread() {
  smval = analogRead(adc); x = map(smval, 0, S_GAIN, 1, 14); if
  (x > 14) x = 14;
}

void drawbargraph() {
  byte y = map(n, 1, 42, 1,
  14);
  display.setTextSize(1);

  //Pointer
  display.setCursor(0, 48);
  display.print("TU");
  switch (y) {
    case 1: display.fillRect(15, 48,
  2, 6, WHITE); break;
    case 2: display.fillRect(20, 48, 2, 6, WHITE); break;

    case 3: display.fillRect(25, 48, 2, 6, WHITE); break;
    case 4: display.fillRect(30,
  48, 2, 6, WHITE); break;
    case 5: display.fillRect(35, 48, 2, 6, WHITE); break;

    case 6: display.fillRect(40, 48, 2, 6, WHITE); break;
    case 7: display.fillRect(45,
  48, 2, 6, WHITE); break;
    case 8: display.fillRect(50, 48, 2, 6, WHITE); break;

    case 9: display.fillRect(55, 48, 2, 6, WHITE); break;
    case 10: display.fillRect(60,
  48, 2, 6, WHITE); break;
    case 11: display.fillRect(65, 48, 2, 6, WHITE);
  break;
    case 12: display.fillRect(70, 48, 2, 6, WHITE); break;
    case
  13: display.fillRect(75, 48, 2, 6, WHITE); break;
    case 14: display.fillRect(80,
  48, 2, 6, WHITE); break;
  }

  //Bargraph
  display.setCursor(0, 57);
  display.print("SM");
  switch (x) {
    case 14: display.fillRect(80, 58,
  2, 6, WHITE);
    case 13: display.fillRect(75, 58, 2, 6, WHITE);
    case
  12: display.fillRect(70, 58, 2, 6, WHITE);
    case 11: display.fillRect(65,
  58, 2, 6, WHITE);
    case 10: display.fillRect(60, 58, 2, 6, WHITE);
    case
  9: display.fillRect(55, 58, 2, 6, WHITE);
    case 8: display.fillRect(50, 58,
  2, 6, WHITE);
    case 7: display.fillRect(45, 58, 2, 6, WHITE);
    case
  6: display.fillRect(40, 58, 2, 6, WHITE);
    case 5: display.fillRect(35, 58,
  2, 6, WHITE);
    case 4: display.fillRect(30, 58, 2, 6, WHITE);
    case
  3: display.fillRect(25, 58, 2, 6, WHITE);
    case 2: display.fillRect(20, 58,
  2, 6, WHITE);
    case 1: display.fillRect(15, 58, 2, 6, WHITE);
  }
}

void
  statup_text() {
  display.setTextSize(1); display.setCursor(13, 18);
  display.print("Si5351
  VFO/RF GEN");
  display.setCursor(6, 40);
  display.print("JCR RADIO - Ver
  2.0");
  display.display(); delay(2000);
}

Sketch SI5351_VFO_RF_GEN_OLED_JCR_V2

c_cpp

Load it to Arduino.

1/**********************************************************************************************************
2  10kHz to 225MHz VFO / RF Generator with Si5351 and Arduino Nano, with Intermediate  Frequency (IF) offset
3  (+ or -), RX/TX Selector for QRP Transceivers, Band Presets  and Bargraph S-Meter. See the schematics for
4  wiring and README.txt for details.  By J. CesarSound - ver 2.0 - Feb/2021.
5***********************************************************************************************************/
6
7//Libraries
8#include  <Wire.h>                 //IDE Standard
9#include <Rotary.h>               //Ben  Buxton https://github.com/brianlow/Rotary
10#include <si5351.h>               //Etherkit  https://github.com/etherkit/Si5351Arduino
11#include <Adafruit_GFX.h>         //Adafruit  GFX https://github.com/adafruit/Adafruit-GFX-Library
12#include <Adafruit_SSD1306.h>     //Adafruit SSD1306 https://github.com/adafruit/Adafruit_SSD1306
13
14//User  preferences
15//------------------------------------------------------------------------------------------------------------
16#define  IF         455       //Enter your IF frequency, ex: 455 = 455kHz, 10700 = 10.7MHz,  0 = to direct convert receiver or RF generator, + will add and - will subtract IF  offfset.
17#define BAND_INIT  7         //Enter your initial Band (1-21) at startup,  ex: 1 = Freq Generator, 2 = 800kHz (MW), 7 = 7.2MHz (40m), 11 = 14.1MHz (20m). 
18#define  XT_CAL_F   33000     //Si5351 calibration factor, adjust to get exatcly 10MHz. Increasing  this value will decreases the frequency and vice versa.
19#define S_GAIN     303       //Adjust the sensitivity of Signal Meter A/D input: 101 = 500mv; 202 = 1v;  303 = 1.5v; 404 = 2v; 505 = 2.5v; 1010 = 5v (max).
20#define tunestep   A0        //The  pin used by tune step push button.
21#define band       A1        //The pin used  by band selector push button.
22#define rx_tx      A2        //The pin used by  RX / TX selector switch, RX = switch open, TX = switch closed to GND. When in TX,  the IF value is not considered.
23#define adc        A3        //The pin used by  Signal Meter A/D input.
24//------------------------------------------------------------------------------------------------------------
25
26Rotary  r = Rotary(2, 3);
27Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);
28Si5351  si5351(0x60); //Si5351 I2C Address 0x60
29
30unsigned long freq, freqold, fstep;
31long  interfreq = IF, interfreqold = 0;
32long cal = XT_CAL_F;
33unsigned int smval;
34byte  encoder = 1;
35byte stp, n = 1;
36byte count, x, xo;
37bool sts = 0;
38unsigned  int period = 100;
39unsigned long time_now = 0;
40
41ISR(PCINT2_vect) {
42  char  result = r.process();
43  if (result == DIR_CW) set_frequency(1);
44  else if  (result == DIR_CCW) set_frequency(-1);
45}
46
47void set_frequency(short dir)  {
48  if (encoder == 1) {                         //Up/Down frequency
49    if  (dir == 1) freq = freq + fstep;
50    if (freq >= 225000000) freq = 225000000;
51    if (dir == -1) freq = freq - fstep;
52    if (fstep == 1000000 && freq <= 1000000)  freq = 1000000;
53    else if (freq < 10000) freq = 10000;
54  }
55  if (encoder  == 1) {                       //Up/Down graph tune pointer
56    if (dir == 1)  n = n + 1;
57    if (n > 42) n = 1;
58    if (dir == -1) n = n - 1;
59    if  (n < 1) n = 42;
60  }
61}
62
63void setup() {
64  Wire.begin();
65  display.begin(SSD1306_SWITCHCAPVCC,  0x3C);
66  display.clearDisplay();
67  display.setTextColor(WHITE);
68  display.display();
69
70  pinMode(2, INPUT_PULLUP);
71  pinMode(3, INPUT_PULLUP);
72  pinMode(tunestep,  INPUT_PULLUP);
73  pinMode(band, INPUT_PULLUP);
74  pinMode(rx_tx, INPUT_PULLUP);
75
76  //statup_text();  //If you hang on startup, comment
77
78  si5351.init(SI5351_CRYSTAL_LOAD_8PF,  0, 0);
79  si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
80  si5351.drive_strength(SI5351_CLK0,  SI5351_DRIVE_8MA);
81  si5351.output_enable(SI5351_CLK0, 1);                  //1  - Enable / 0 - Disable CLK
82  si5351.output_enable(SI5351_CLK1, 0);
83  si5351.output_enable(SI5351_CLK2,  0);
84
85  PCICR |= (1 << PCIE2);
86  PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);
87  sei();
88
89  count = BAND_INIT;
90  bandpresets();
91  stp = 4;
92  setstep();
93}
94
95void  loop() {
96  if (freqold != freq) {
97    time_now = millis();
98    tunegen();
99    freqold = freq;
100  }
101
102  if (interfreqold != interfreq) {
103    time_now  = millis();
104    tunegen();
105    interfreqold = interfreq;
106  }
107
108  if  (xo != x) {
109    time_now = millis();
110    xo = x;
111  }
112
113  if (digitalRead(tunestep)  == LOW) {
114    time_now = (millis() + 300);
115    setstep();
116    delay(300);
117  }
118
119  if (digitalRead(band) == LOW) {
120    time_now = (millis() + 300);
121    inc_preset();
122    delay(300);
123  }
124
125  if (digitalRead(rx_tx) == LOW)  {
126    time_now = (millis() + 300);
127    sts = 1;
128  } else sts = 0;
129
130  if ((time_now + period) > millis()) {
131    displayfreq();
132    layout();
133  }
134  sgnalread();
135}
136
137void tunegen() {
138  si5351.set_freq((freq +  (interfreq * 1000ULL)) * 100ULL, SI5351_CLK0);
139}
140
141void displayfreq() {
142  unsigned int m = freq / 1000000;
143  unsigned int k = (freq % 1000000) / 1000;
144  unsigned int h = (freq % 1000) / 1;
145
146  display.clearDisplay();
147  display.setTextSize(2);
148
149  char buffer[15] = "";
150  if (m < 1) {
151    display.setCursor(41, 1); sprintf(buffer,  "%003d.%003d", k, h);
152  }
153  else if (m < 100) {
154    display.setCursor(5,  1); sprintf(buffer, "%2d.%003d.%003d", m, k, h);
155  }
156  else if (m >= 100)  {
157    unsigned int h = (freq % 1000) / 10;
158    display.setCursor(5, 1); sprintf(buffer,  "%2d.%003d.%02d", m, k, h);
159  }
160  display.print(buffer);
161}
162
163void  setstep() {
164  switch (stp) {
165    case 1: stp = 2; fstep = 1; break;
166    case  2: stp = 3; fstep = 10; break;
167    case 3: stp = 4; fstep = 1000; break;
168    case 4: stp = 5; fstep = 5000; break;
169    case 5: stp = 6; fstep = 10000;  break;
170    case 6: stp = 1; fstep = 1000000; break;
171  }
172}
173
174void inc_preset()  {
175  count++;
176  if (count > 21) count = 1;
177  bandpresets();
178  delay(50);
179}
180
181void  bandpresets() {
182  switch (count)  {
183    case 1: freq = 100000; tunegen();  break;
184    case 2: freq = 800000; break;
185    case 3: freq = 1800000; break;
186    case 4: freq = 3650000; break;
187    case 5: freq = 4985000; break;
188    case  6: freq = 6180000; break;
189    case 7: freq = 7200000; break;
190    case 8: freq  = 10000000; break;
191    case 9: freq = 11780000; break;
192    case 10: freq =  13630000; break;
193    case 11: freq = 14100000; break;
194    case 12: freq =  15000000; break;
195    case 13: freq = 17655000; break;
196    case 14: freq =  21525000; break;
197    case 15: freq = 27015000; break;
198    case 16: freq =  28400000; break;
199    case 17: freq = 50000000; break;
200    case 18: freq =  100000000; break;
201    case 19: freq = 130000000; break;
202    case 20: freq  = 144000000; break;
203    case 21: freq = 220000000; break;
204  }
205  si5351.pll_reset(SI5351_PLLA);
206  stp = 4; setstep();
207}
208
209void layout() {
210  display.setTextColor(WHITE);
211  display.drawLine(0, 20, 127, 20, WHITE);
212  display.drawLine(0, 43, 127, 43,  WHITE);
213  display.drawLine(105, 24, 105, 39, WHITE);
214  display.drawLine(87,  24, 87, 39, WHITE);
215  display.drawLine(87, 48, 87, 63, WHITE);
216  display.drawLine(15,  55, 82, 55, WHITE);
217  display.setTextSize(1);
218  display.setCursor(59, 23);
219  display.print("STEP");
220  display.setCursor(54, 33);
221  if (stp == 2) display.print("  1Hz"); if (stp == 3) display.print(" 10Hz"); if (stp == 4) display.print("  1kHz");
222  if (stp == 5) display.print(" 5kHz"); if (stp == 6) display.print("10kHz");  if (stp == 1) display.print(" 1MHz");
223  display.setTextSize(1);
224  display.setCursor(92,  48);
225  display.print("IF:");
226  display.setCursor(92, 57);
227  display.print(interfreq);
228  display.print("k");
229  display.setTextSize(1);
230  display.setCursor(110,  23);
231  if (freq < 1000000) display.print("kHz");
232  if (freq >= 1000000)  display.print("MHz");
233  display.setCursor(110, 33);
234  if (interfreq == 0)  display.print("VFO");
235  if (interfreq != 0) display.print("L O");
236  display.setCursor(91,  28);
237  if (!sts) display.print("RX"); if (!sts) interfreq = IF;
238  if (sts)  display.print("TX"); if (sts) interfreq = 0;
239  bandlist(); drawbargraph();
240  display.display();
241}
242
243void bandlist() {
244  display.setTextSize(2);
245  display.setCursor(0, 25);
246  if (count == 1) display.print("GEN"); if (count  == 2) display.print("MW"); if (count == 3) display.print("160m"); if (count  == 4) display.print("80m");
247  if (count == 5) display.print("60m"); if (count  == 6) display.print("49m"); if (count == 7) display.print("40m"); if (count  == 8) display.print("31m");
248  if (count == 9) display.print("25m"); if (count  == 10) display.print("22m"); if (count == 11) display.print("20m"); if (count  == 12) display.print("19m");
249  if (count == 13) display.print("16m"); if  (count == 14) display.print("13m"); if (count == 15) display.print("11m"); if  (count == 16) display.print("10m");
250  if (count == 17) display.print("6m");  if (count == 18) display.print("WFM"); if (count == 19) display.print("AIR");  if (count == 20) display.print("2m");
251  if (count == 21) display.print("1m");
252  if (count == 1) interfreq = 0; else if (!sts) interfreq = IF;
253}
254
255void  sgnalread() {
256  smval = analogRead(adc); x = map(smval, 0, S_GAIN, 1, 14); if  (x > 14) x = 14;
257}
258
259void drawbargraph() {
260  byte y = map(n, 1, 42, 1,  14);
261  display.setTextSize(1);
262
263  //Pointer
264  display.setCursor(0, 48);  display.print("TU");
265  switch (y) {
266    case 1: display.fillRect(15, 48,  2, 6, WHITE); break;
267    case 2: display.fillRect(20, 48, 2, 6, WHITE); break;
268    case 3: display.fillRect(25, 48, 2, 6, WHITE); break;
269    case 4: display.fillRect(30,  48, 2, 6, WHITE); break;
270    case 5: display.fillRect(35, 48, 2, 6, WHITE); break;
271    case 6: display.fillRect(40, 48, 2, 6, WHITE); break;
272    case 7: display.fillRect(45,  48, 2, 6, WHITE); break;
273    case 8: display.fillRect(50, 48, 2, 6, WHITE); break;
274    case 9: display.fillRect(55, 48, 2, 6, WHITE); break;
275    case 10: display.fillRect(60,  48, 2, 6, WHITE); break;
276    case 11: display.fillRect(65, 48, 2, 6, WHITE);  break;
277    case 12: display.fillRect(70, 48, 2, 6, WHITE); break;
278    case  13: display.fillRect(75, 48, 2, 6, WHITE); break;
279    case 14: display.fillRect(80,  48, 2, 6, WHITE); break;
280  }
281
282  //Bargraph
283  display.setCursor(0, 57);  display.print("SM");
284  switch (x) {
285    case 14: display.fillRect(80, 58,  2, 6, WHITE);
286    case 13: display.fillRect(75, 58, 2, 6, WHITE);
287    case  12: display.fillRect(70, 58, 2, 6, WHITE);
288    case 11: display.fillRect(65,  58, 2, 6, WHITE);
289    case 10: display.fillRect(60, 58, 2, 6, WHITE);
290    case  9: display.fillRect(55, 58, 2, 6, WHITE);
291    case 8: display.fillRect(50, 58,  2, 6, WHITE);
292    case 7: display.fillRect(45, 58, 2, 6, WHITE);
293    case  6: display.fillRect(40, 58, 2, 6, WHITE);
294    case 5: display.fillRect(35, 58,  2, 6, WHITE);
295    case 4: display.fillRect(30, 58, 2, 6, WHITE);
296    case  3: display.fillRect(25, 58, 2, 6, WHITE);
297    case 2: display.fillRect(20, 58,  2, 6, WHITE);
298    case 1: display.fillRect(15, 58, 2, 6, WHITE);
299  }
300}
301
302void  statup_text() {
303  display.setTextSize(1); display.setCursor(13, 18);
304  display.print("Si5351  VFO/RF GEN");
305  display.setCursor(6, 40);
306  display.print("JCR RADIO - Ver  2.0");
307  display.display(); delay(2000);
308}

/**********************************************************************************************************
  10kHz to 225MHz VFO / RF Generator with Si5351 and Arduino Nano, with Intermediate  Frequency (IF) offset
  (+ or -), RX/TX Selector for QRP Transceivers, Band Presets  and Bargraph S-Meter. See the schematics for
  wiring and README.txt for details.  By J. CesarSound - ver 2.0 - Feb/2021.
***********************************************************************************************************/

//Libraries
#include  <Wire.h>                 //IDE Standard
#include <Rotary.h>               //Ben  Buxton https://github.com/brianlow/Rotary
#include <si5351.h>               //Etherkit  https://github.com/etherkit/Si5351Arduino
#include <Adafruit_GFX.h>         //Adafruit  GFX https://github.com/adafruit/Adafruit-GFX-Library
#include <Adafruit_SSD1306.h>     //Adafruit SSD1306 https://github.com/adafruit/Adafruit_SSD1306

//User  preferences
//------------------------------------------------------------------------------------------------------------
#define  IF         455       //Enter your IF frequency, ex: 455 = 455kHz, 10700 = 10.7MHz,  0 = to direct convert receiver or RF generator, + will add and - will subtract IF  offfset.
#define BAND_INIT  7         //Enter your initial Band (1-21) at startup,  ex: 1 = Freq Generator, 2 = 800kHz (MW), 7 = 7.2MHz (40m), 11 = 14.1MHz (20m). 
#define  XT_CAL_F   33000     //Si5351 calibration factor, adjust to get exatcly 10MHz. Increasing  this value will decreases the frequency and vice versa.
#define S_GAIN     303       //Adjust the sensitivity of Signal Meter A/D input: 101 = 500mv; 202 = 1v;  303 = 1.5v; 404 = 2v; 505 = 2.5v; 1010 = 5v (max).
#define tunestep   A0        //The  pin used by tune step push button.
#define band       A1        //The pin used  by band selector push button.
#define rx_tx      A2        //The pin used by  RX / TX selector switch, RX = switch open, TX = switch closed to GND. When in TX,  the IF value is not considered.
#define adc        A3        //The pin used by  Signal Meter A/D input.
//------------------------------------------------------------------------------------------------------------

Rotary  r = Rotary(2, 3);
Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);
Si5351  si5351(0x60); //Si5351 I2C Address 0x60

unsigned long freq, freqold, fstep;
long  interfreq = IF, interfreqold = 0;
long cal = XT_CAL_F;
unsigned int smval;
byte  encoder = 1;
byte stp, n = 1;
byte count, x, xo;
bool sts = 0;
unsigned  int period = 100;
unsigned long time_now = 0;

ISR(PCINT2_vect) {
  char  result = r.process();
  if (result == DIR_CW) set_frequency(1);
  else if  (result == DIR_CCW) set_frequency(-1);
}

void set_frequency(short dir)  {
  if (encoder == 1) {                         //Up/Down frequency
    if  (dir == 1) freq = freq + fstep;
    if (freq >= 225000000) freq = 225000000;
    if (dir == -1) freq = freq - fstep;
    if (fstep == 1000000 && freq <= 1000000)  freq = 1000000;
    else if (freq < 10000) freq = 10000;
  }
  if (encoder  == 1) {                       //Up/Down graph tune pointer
    if (dir == 1)  n = n + 1;
    if (n > 42) n = 1;
    if (dir == -1) n = n - 1;
    if  (n < 1) n = 42;
  }
}

void setup() {
  Wire.begin();
  display.begin(SSD1306_SWITCHCAPVCC,  0x3C);
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.display();

  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(tunestep,  INPUT_PULLUP);
  pinMode(band, INPUT_PULLUP);
  pinMode(rx_tx, INPUT_PULLUP);

  //statup_text();  //If you hang on startup, comment

  si5351.init(SI5351_CRYSTAL_LOAD_8PF,  0, 0);
  si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
  si5351.drive_strength(SI5351_CLK0,  SI5351_DRIVE_8MA);
  si5351.output_enable(SI5351_CLK0, 1);                  //1  - Enable / 0 - Disable CLK
  si5351.output_enable(SI5351_CLK1, 0);
  si5351.output_enable(SI5351_CLK2,  0);

  PCICR |= (1 << PCIE2);
  PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);
  sei();

  count = BAND_INIT;
  bandpresets();
  stp = 4;
  setstep();
}

void  loop() {
  if (freqold != freq) {
    time_now = millis();
    tunegen();
    freqold = freq;
  }

  if (interfreqold != interfreq) {
    time_now  = millis();
    tunegen();
    interfreqold = interfreq;
  }

  if  (xo != x) {
    time_now = millis();
    xo = x;
  }

  if (digitalRead(tunestep)  == LOW) {
    time_now = (millis() + 300);
    setstep();
    delay(300);
  }

  if (digitalRead(band) == LOW) {
    time_now = (millis() + 300);
    inc_preset();
    delay(300);
  }

  if (digitalRead(rx_tx) == LOW)  {
    time_now = (millis() + 300);
    sts = 1;
  } else sts = 0;

  if ((time_now + period) > millis()) {
    displayfreq();
    layout();
  }
  sgnalread();
}

void tunegen() {
  si5351.set_freq((freq +  (interfreq * 1000ULL)) * 100ULL, SI5351_CLK0);
}

void displayfreq() {
  unsigned int m = freq / 1000000;
  unsigned int k = (freq % 1000000) / 1000;
  unsigned int h = (freq % 1000) / 1;

  display.clearDisplay();
  display.setTextSize(2);

  char buffer[15] = "";
  if (m < 1) {
    display.setCursor(41, 1); sprintf(buffer,  "%003d.%003d", k, h);
  }
  else if (m < 100) {
    display.setCursor(5,  1); sprintf(buffer, "%2d.%003d.%003d", m, k, h);
  }
  else if (m >= 100)  {
    unsigned int h = (freq % 1000) / 10;
    display.setCursor(5, 1); sprintf(buffer,  "%2d.%003d.%02d", m, k, h);
  }
  display.print(buffer);
}

void  setstep() {
  switch (stp) {
    case 1: stp = 2; fstep = 1; break;
    case  2: stp = 3; fstep = 10; break;
    case 3: stp = 4; fstep = 1000; break;
    case 4: stp = 5; fstep = 5000; break;
    case 5: stp = 6; fstep = 10000;  break;
    case 6: stp = 1; fstep = 1000000; break;
  }
}

void inc_preset()  {
  count++;
  if (count > 21) count = 1;
  bandpresets();
  delay(50);
}

void  bandpresets() {
  switch (count)  {
    case 1: freq = 100000; tunegen();  break;
    case 2: freq = 800000; break;
    case 3: freq = 1800000; break;
    case 4: freq = 3650000; break;
    case 5: freq = 4985000; break;
    case  6: freq = 6180000; break;
    case 7: freq = 7200000; break;
    case 8: freq  = 10000000; break;
    case 9: freq = 11780000; break;
    case 10: freq =  13630000; break;
    case 11: freq = 14100000; break;
    case 12: freq =  15000000; break;
    case 13: freq = 17655000; break;
    case 14: freq =  21525000; break;
    case 15: freq = 27015000; break;
    case 16: freq =  28400000; break;
    case 17: freq = 50000000; break;
    case 18: freq =  100000000; break;
    case 19: freq = 130000000; break;
    case 20: freq  = 144000000; break;
    case 21: freq = 220000000; break;
  }
  si5351.pll_reset(SI5351_PLLA);
  stp = 4; setstep();
}

void layout() {
  display.setTextColor(WHITE);
  display.drawLine(0, 20, 127, 20, WHITE);
  display.drawLine(0, 43, 127, 43,  WHITE);
  display.drawLine(105, 24, 105, 39, WHITE);
  display.drawLine(87,  24, 87, 39, WHITE);
  display.drawLine(87, 48, 87, 63, WHITE);
  display.drawLine(15,  55, 82, 55, WHITE);
  display.setTextSize(1);
  display.setCursor(59, 23);
  display.print("STEP");
  display.setCursor(54, 33);
  if (stp == 2) display.print("  1Hz"); if (stp == 3) display.print(" 10Hz"); if (stp == 4) display.print("  1kHz");
  if (stp == 5) display.print(" 5kHz"); if (stp == 6) display.print("10kHz");  if (stp == 1) display.print(" 1MHz");
  display.setTextSize(1);
  display.setCursor(92,  48);
  display.print("IF:");
  display.setCursor(92, 57);
  display.print(interfreq);
  display.print("k");
  display.setTextSize(1);
  display.setCursor(110,  23);
  if (freq < 1000000) display.print("kHz");
  if (freq >= 1000000)  display.print("MHz");
  display.setCursor(110, 33);
  if (interfreq == 0)  display.print("VFO");
  if (interfreq != 0) display.print("L O");
  display.setCursor(91,  28);
  if (!sts) display.print("RX"); if (!sts) interfreq = IF;
  if (sts)  display.print("TX"); if (sts) interfreq = 0;
  bandlist(); drawbargraph();
  display.display();
}

void bandlist() {
  display.setTextSize(2);
  display.setCursor(0, 25);
  if (count == 1) display.print("GEN"); if (count  == 2) display.print("MW"); if (count == 3) display.print("160m"); if (count  == 4) display.print("80m");
  if (count == 5) display.print("60m"); if (count  == 6) display.print("49m"); if (count == 7) display.print("40m"); if (count  == 8) display.print("31m");
  if (count == 9) display.print("25m"); if (count  == 10) display.print("22m"); if (count == 11) display.print("20m"); if (count  == 12) display.print("19m");
  if (count == 13) display.print("16m"); if  (count == 14) display.print("13m"); if (count == 15) display.print("11m"); if  (count == 16) display.print("10m");
  if (count == 17) display.print("6m");  if (count == 18) display.print("WFM"); if (count == 19) display.print("AIR");  if (count == 20) display.print("2m");
  if (count == 21) display.print("1m");
  if (count == 1) interfreq = 0; else if (!sts) interfreq = IF;
}

void  sgnalread() {
  smval = analogRead(adc); x = map(smval, 0, S_GAIN, 1, 14); if  (x > 14) x = 14;
}

void drawbargraph() {
  byte y = map(n, 1, 42, 1,  14);
  display.setTextSize(1);

  //Pointer
  display.setCursor(0, 48);  display.print("TU");
  switch (y) {
    case 1: display.fillRect(15, 48,  2, 6, WHITE); break;
    case 2: display.fillRect(20, 48, 2, 6, WHITE); break;
    case 3: display.fillRect(25, 48, 2, 6, WHITE); break;
    case 4: display.fillRect(30,  48, 2, 6, WHITE); break;
    case 5: display.fillRect(35, 48, 2, 6, WHITE); break;
    case 6: display.fillRect(40, 48, 2, 6, WHITE); break;
    case 7: display.fillRect(45,  48, 2, 6, WHITE); break;
    case 8: display.fillRect(50, 48, 2, 6, WHITE); break;
    case 9: display.fillRect(55, 48, 2, 6, WHITE); break;
    case 10: display.fillRect(60,  48, 2, 6, WHITE); break;
    case 11: display.fillRect(65, 48, 2, 6, WHITE);  break;
    case 12: display.fillRect(70, 48, 2, 6, WHITE); break;
    case  13: display.fillRect(75, 48, 2, 6, WHITE); break;
    case 14: display.fillRect(80,  48, 2, 6, WHITE); break;
  }

  //Bargraph
  display.setCursor(0, 57);  display.print("SM");
  switch (x) {
    case 14: display.fillRect(80, 58,  2, 6, WHITE);
    case 13: display.fillRect(75, 58, 2, 6, WHITE);
    case  12: display.fillRect(70, 58, 2, 6, WHITE);
    case 11: display.fillRect(65,  58, 2, 6, WHITE);
    case 10: display.fillRect(60, 58, 2, 6, WHITE);
    case  9: display.fillRect(55, 58, 2, 6, WHITE);
    case 8: display.fillRect(50, 58,  2, 6, WHITE);
    case 7: display.fillRect(45, 58, 2, 6, WHITE);
    case  6: display.fillRect(40, 58, 2, 6, WHITE);
    case 5: display.fillRect(35, 58,  2, 6, WHITE);
    case 4: display.fillRect(30, 58, 2, 6, WHITE);
    case  3: display.fillRect(25, 58, 2, 6, WHITE);
    case 2: display.fillRect(20, 58,  2, 6, WHITE);
    case 1: display.fillRect(15, 58, 2, 6, WHITE);
  }
}

void  statup_text() {
  display.setTextSize(1); display.setCursor(13, 18);
  display.print("Si5351  VFO/RF GEN");
  display.setCursor(6, 40);
  display.print("JCR RADIO - Ver  2.0");
  display.display(); delay(2000);
}

Downloadable files

Schematics wiring

Wiring the circuit

Schematics wiring

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