Arduino VFO Project with a Large LCD Display

Cheap and easy-to-build VFO device that is almost indispensable in radio engineering, especially in DIY radio receivers.

Jan 16, 2025

•

2284 views

•

1 respects

•

GPL3+

Monitoring

Tools

Robots

Components and supplies

rotary encoder

Generic 128x64 OLED I2C

Electric Switches

Push Button

SI5351 CLOCK GEN MODULE

Arduino Nano

Tools and machines

Soldering kit

Apps and platforms

Arduino IDE

Project description

Code

cpp

...

1#include <Wire.h>
2#include <Rotary.h>
3#include <si5351.h>
4#include <U8g2lib.h>
5
6// Pin definitions
7#define PIN_TUNESTEP A0
8#define PIN_BAND     A1
9#define PIN_RX_TX    A2
10#define PIN_ADC      A3
11#define PIN_ROT_1    2
12#define PIN_ROT_2    3
13#define PIN_RST      8
14#define PIN_CS       10
15#define PIN_MOSI     11
16#define PIN_SCK      13
17
18// Constants
19#define IF_FREQ    455
20#define BAND_INIT  7
21#define XT_CAL_F   33000
22#define S_GAIN     303
23
24// Frequency range limits
25const uint32_t MIN_FREQ = 10000UL;      // 10 kHz
26const uint32_t MAX_FREQ = 225000000UL;  // 225 MHz
27
28// Band names stored in program memory
29const char BAND_0[] PROGMEM = " GEN";
30const char BAND_1[] PROGMEM = " MW";
31const char BAND_2[] PROGMEM = " 160m";
32const char BAND_3[] PROGMEM = " 80m";
33const char BAND_4[] PROGMEM = " 60m";
34const char BAND_5[] PROGMEM = " 49m";
35const char BAND_6[] PROGMEM = " 40m";
36const char BAND_7[] PROGMEM = " 31m";
37const char BAND_8[] PROGMEM = " 25m";
38const char BAND_9[] PROGMEM = " 22m";
39const char BAND_10[] PROGMEM = " 20m";
40const char BAND_11[] PROGMEM = " 19m";
41const char BAND_12[] PROGMEM = " 16m";
42const char BAND_13[] PROGMEM = " 13m";
43const char BAND_14[] PROGMEM = " 11m";
44const char BAND_15[] PROGMEM = " 10m";
45const char BAND_16[] PROGMEM = " 6m";
46const char BAND_17[] PROGMEM = " WFM";
47const char BAND_18[] PROGMEM = " AIR";
48const char BAND_19[] PROGMEM = " 2m";
49const char BAND_20[] PROGMEM = " 1m";
50
51const char* const BAND_NAMES[] PROGMEM = {
52  BAND_0, BAND_1, BAND_2, BAND_3, BAND_4, BAND_5, BAND_6, BAND_7, BAND_8, BAND_9,
53  BAND_10, BAND_11, BAND_12, BAND_13, BAND_14, BAND_15, BAND_16, BAND_17,
54  BAND_18, BAND_19, BAND_20
55};
56
57// Frequency presets stored in program memory
58const uint32_t FREQ_PRESETS[] PROGMEM = {
59  100000UL,    // GEN
60  800000UL,    // MW
61  1800000UL,   // 160m
62  3650000UL,   // 80m
63  4985000UL,   // 60m
64  6180000UL,   // 49m
65  7200000UL,   // 40m
66  10000000UL,  // 31m
67  11780000UL,  // 25m
68  13630000UL,  // 22m
69  14100000UL,  // 20m
70  15000000UL,  // 19m
71  17655000UL,  // 16m
72  21525000UL,  // 13m
73  27015000UL,  // 11m
74  28400000UL,  // 10m
75  50000000UL,  // 6m
76  100000000UL, // WFM
77  130000000UL, // AIR
78  144000000UL, // 2m
79  220000000UL  // 1m
80};
81
82// Frequency steps
83const uint32_t FREQ_STEPS[] PROGMEM = {
84  1000000UL,  // 1 MHz
85  1UL,        // 1 Hz
86  10UL,       // 10 Hz
87  1000UL,     // 1 kHz
88  5000UL,     // 5 kHz
89  10000UL     // 10 kHz
90};
91
92// Object initialization
93U8G2_ST7920_128X64_1_SW_SPI u8g2(U8G2_R0, PIN_SCK, PIN_MOSI, PIN_CS, PIN_RST);
94Rotary r = Rotary(PIN_ROT_1, PIN_ROT_2);
95Si5351 si5351;
96
97// Global variables
98uint32_t freq = 7200000UL;      // Start at 7.2MHz
99uint32_t freqold;
100uint32_t fstep = 1000;          // Default step 1kHz
101int16_t interfreq = IF_FREQ;
102int16_t cal = XT_CAL_F;
103uint8_t smval;
104uint8_t encoder = 1;
105uint8_t stp = 4;
106uint8_t n = 1;
107uint8_t count = BAND_INIT;
108uint8_t prevCount = BAND_INIT;
109uint8_t x, xo;
110bool sts = 0;
111bool displayOK = false;
112
113// Function prototypes
114bool setSi5351Frequency(Si5351& si5351, uint32_t freq, int16_t interfreq);
115void check_inputs();
116void update_display_paged();
117void initializeSi5351();
118
119// Encoder interrupt service routine
120ISR(PCINT2_vect) {
121  char result = r.process();
122  if (result == DIR_CW) {
123    if (encoder == 1) {
124      uint32_t new_freq = freq + fstep;
125      if (new_freq <= MAX_FREQ) {
126        freq = new_freq;
127        n = (n >= 42) ? 1 : n + 1;
128      }
129    }
130  }
131  else if (result == DIR_CCW) {
132    if (encoder == 1) {
133      uint32_t new_freq = freq;
134      if (freq >= fstep) {
135        new_freq = freq - fstep;
136        if (new_freq >= MIN_FREQ) {
137          freq = new_freq;
138          n = (n <= 1) ? 42 : n - 1;
139        }
140      }
141    }
142  }
143}
144
145void setup() {
146  Serial.begin(9600);
147  Serial.println(F("VFO Starting..."));
148  
149  Wire.begin();
150  
151  if (!u8g2.begin()) {
152    Serial.println(F("Display init failed!"));
153    while (1) { delay(1000); }
154  }
155  
156  // Display initialization test
157  u8g2.setFont(u8g2_font_6x12_tr);
158  u8g2.firstPage();
159  do {
160    u8g2.drawFrame(0, 0, 128, 64);
161    u8g2.drawStr(20, 32, "Initializing...");
162  } while (u8g2.nextPage());
163  delay(1000);
164  
165  Serial.println(F("Display initialized"));
166  displayOK = true;
167
168  // Initialize pins
169  pinMode(PIN_ROT_1, INPUT_PULLUP);
170  pinMode(PIN_ROT_2, INPUT_PULLUP);
171  pinMode(PIN_TUNESTEP, INPUT_PULLUP);
172  pinMode(PIN_BAND, INPUT_PULLUP);
173  pinMode(PIN_RX_TX, INPUT_PULLUP);
174
175  // Initialize Si5351
176  initializeSi5351();
177  
178  // Setup rotary encoder interrupts
179  PCICR |= (1 << PCIE2);
180  PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);
181  sei();
182
183  // Set initial frequency
184  freq = pgm_read_dword(&FREQ_PRESETS[count - 1]);
185  
186  Serial.println(F("Setup complete"));
187}
188
189void initializeSi5351() {
190  Serial.println(F("Initializing Si5351..."));
191  if (!si5351.init(SI5351_CRYSTAL_LOAD_8PF, 0, 0)) {
192    Serial.println(F("Si5351 init failed!"));
193  }
194  si5351.reset();
195  delay(10);
196  si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
197  si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_8MA);
198  si5351.output_enable(SI5351_CLK0, 1);
199}
200
201bool setSi5351Frequency(Si5351& si5351, uint32_t freq, int16_t interfreq) {
202  // Check if frequency is within valid range
203  if (freq < MIN_FREQ || freq > MAX_FREQ) {
204    return false;
205  }
206  
207  uint64_t output_freq = (freq + (interfreq * 1000ULL)) * 100ULL;
208  
209  // Handle GEN mode specially
210  if (count == 1) {
211    si5351.reset();
212    delay(10);
213    si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
214    si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_8MA);
215  }
216  
217  // Set the frequency
218  si5351.set_freq(output_freq, SI5351_CLK0);
219  si5351.output_enable(SI5351_CLK0, 1);
220  
221  return true;
222}
223
224void loop() {
225  if (!displayOK) return;
226
227  // Process frequency changes with error handling
228  if (freqold != freq) {
229    if (!setSi5351Frequency(si5351, freq, interfreq)) {
230      // If frequency setting fails, try to recover
231      si5351.reset();
232      delay(10);
233      si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
234      si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_8MA);
235      setSi5351Frequency(si5351, freq, interfreq);
236    }
237    freqold = freq;
238  }
239
240  // Check inputs
241  check_inputs();
242  
243  // Update display
244  update_display_paged();
245  
246  // Read signal meter
247  smval = analogRead(PIN_ADC);
248  x = constrain(map(smval, 0, S_GAIN, 1, 14), 1, 14);
249}
250
251void check_inputs() {
252  if (digitalRead(PIN_TUNESTEP) == LOW) {
253    stp = (stp % 6) + 1;
254    fstep = pgm_read_dword(&FREQ_STEPS[stp - 1]);
255    delay(300);
256  }
257
258  if (digitalRead(PIN_BAND) == LOW) {
259    uint8_t newCount = (count % 21) + 1;
260    
261    // Reset Si5351 when entering or leaving GEN mode
262    if (newCount == 1 || count == 1) {
263      si5351.reset();
264      delay(10);
265      si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
266      si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_8MA);
267      si5351.output_enable(SI5351_CLK0, 1);
268    }
269    
270    count = newCount;
271    freq = pgm_read_dword(&FREQ_PRESETS[count - 1]);
272    prevCount = count;
273    delay(300);
274  }
275
276  sts = (digitalRead(PIN_RX_TX) == LOW);
277  interfreq = (sts || count == 1) ? 0 : IF_FREQ;
278}
279
280void update_display_paged() {
281  u8g2.firstPage();
282  do {
283    // Display frequency
284    char buffer[16];
285    uint32_t m = freq / 1000000UL;
286    uint32_t k = (freq % 1000000UL) / 1000UL;
287    uint32_t h = (freq % 1000UL);
288    
289    u8g2.setFont(u8g2_font_10x20_tr);
290    
291    if (m < 1) {
292      sprintf(buffer, "%03lu.%03lu", k, h);
293      u8g2.drawStr(41, 17, buffer);
294    } else if (m < 100) {
295      sprintf(buffer, "%lu.%03lu.%03lu", m, k, h);
296      u8g2.drawStr(15, 17, buffer);
297    } else {
298      sprintf(buffer, "%lu.%03lu.%03lu", m, k, h);
299      u8g2.drawStr(15, 17, buffer);
300    }
301    
302    // Draw interface elements
303    u8g2.setFont(u8g2_font_6x12_tr);
304    u8g2.drawHLine(0, 22, 128);
305    u8g2.drawHLine(0, 45, 128);
306    u8g2.drawHLine(15, 54, 67);
307    u8g2.drawVLine(105, 26, 15);
308    u8g2.drawVLine(87, 26, 15);
309    u8g2.drawVLine(87, 50, 15);
310    
311    // Display RX/TX status
312    u8g2.drawStr(91, 37, sts ? "TX" : "RX");
313    
314    // Display IF frequency
315    sprintf(buffer, "IF:%d", interfreq);
316    u8g2.drawStr(90, 59, buffer);
317    
318    // Display LO value
319    sprintf(buffer, "LO:%d", interfreq);
320    u8g2.drawStr(110, 38, buffer);
321    
322    // Display step
323    u8g2.drawStr(54, 32, "STEP");
324    switch(stp) {
325      case 1: u8g2.drawStr(54, 42, "1MHz"); break;
326      case 2: u8g2.drawStr(54, 42, "1Hz"); break;
327      case 3: u8g2.drawStr(54, 42, "10Hz"); break;
328      case 4: u8g2.drawStr(54, 42, "1kHz"); break;
329      case 5: u8g2.drawStr(54, 42, "5kHz"); break;
330      case 6: u8g2.drawStr(54, 42, "10kHz"); break;
331    }
332    
333    // Display band name
334    u8g2.setFont(u8g2_font_10x20_tr);
335    strcpy_P(buffer, (char*)pgm_read_word(&(BAND_NAMES[count - 1])));
336    u8g2.drawStr(0, 40, buffer);
337    
338    // Draw meters
339    u8g2.setFont(u8g2_font_6x12_tr);
340    byte y = map(n, 1, 42, 1, 14);
341    
342    u8g2.drawStr(0, 54, "TU");
343    u8g2.drawBox(15 + (y-1)*5, 47, 2, 6);
344    
345    u8g2.drawStr(0, 63, "SM");
346    for (byte i = 1; i <= x; i++) {
347      u8g2.drawBox(15 + (i-1)*5, 57, 2, 6);
348    }
349    
350  } while (u8g2.nextPage());
351}

#include <Wire.h>
#include <Rotary.h>
#include <si5351.h>
#include <U8g2lib.h>

// Pin definitions
#define PIN_TUNESTEP A0
#define PIN_BAND     A1
#define PIN_RX_TX    A2
#define PIN_ADC      A3
#define PIN_ROT_1    2
#define PIN_ROT_2    3
#define PIN_RST      8
#define PIN_CS       10
#define PIN_MOSI     11
#define PIN_SCK      13

// Constants
#define IF_FREQ    455
#define BAND_INIT  7
#define XT_CAL_F   33000
#define S_GAIN     303

// Frequency range limits
const uint32_t MIN_FREQ = 10000UL;      // 10 kHz
const uint32_t MAX_FREQ = 225000000UL;  // 225 MHz

// Band names stored in program memory
const char BAND_0[] PROGMEM = " GEN";
const char BAND_1[] PROGMEM = " MW";
const char BAND_2[] PROGMEM = " 160m";
const char BAND_3[] PROGMEM = " 80m";
const char BAND_4[] PROGMEM = " 60m";
const char BAND_5[] PROGMEM = " 49m";
const char BAND_6[] PROGMEM = " 40m";
const char BAND_7[] PROGMEM = " 31m";
const char BAND_8[] PROGMEM = " 25m";
const char BAND_9[] PROGMEM = " 22m";
const char BAND_10[] PROGMEM = " 20m";
const char BAND_11[] PROGMEM = " 19m";
const char BAND_12[] PROGMEM = " 16m";
const char BAND_13[] PROGMEM = " 13m";
const char BAND_14[] PROGMEM = " 11m";
const char BAND_15[] PROGMEM = " 10m";
const char BAND_16[] PROGMEM = " 6m";
const char BAND_17[] PROGMEM = " WFM";
const char BAND_18[] PROGMEM = " AIR";
const char BAND_19[] PROGMEM = " 2m";
const char BAND_20[] PROGMEM = " 1m";

const char* const BAND_NAMES[] PROGMEM = {
  BAND_0, BAND_1, BAND_2, BAND_3, BAND_4, BAND_5, BAND_6, BAND_7, BAND_8, BAND_9,
  BAND_10, BAND_11, BAND_12, BAND_13, BAND_14, BAND_15, BAND_16, BAND_17,
  BAND_18, BAND_19, BAND_20
};

// Frequency presets stored in program memory
const uint32_t FREQ_PRESETS[] PROGMEM = {
  100000UL,    // GEN
  800000UL,    // MW
  1800000UL,   // 160m
  3650000UL,   // 80m
  4985000UL,   // 60m
  6180000UL,   // 49m
  7200000UL,   // 40m
  10000000UL,  // 31m
  11780000UL,  // 25m
  13630000UL,  // 22m
  14100000UL,  // 20m
  15000000UL,  // 19m
  17655000UL,  // 16m
  21525000UL,  // 13m
  27015000UL,  // 11m
  28400000UL,  // 10m
  50000000UL,  // 6m
  100000000UL, // WFM
  130000000UL, // AIR
  144000000UL, // 2m
  220000000UL  // 1m
};

// Frequency steps
const uint32_t FREQ_STEPS[] PROGMEM = {
  1000000UL,  // 1 MHz
  1UL,        // 1 Hz
  10UL,       // 10 Hz
  1000UL,     // 1 kHz
  5000UL,     // 5 kHz
  10000UL     // 10 kHz
};

// Object initialization
U8G2_ST7920_128X64_1_SW_SPI u8g2(U8G2_R0, PIN_SCK, PIN_MOSI, PIN_CS, PIN_RST);
Rotary r = Rotary(PIN_ROT_1, PIN_ROT_2);
Si5351 si5351;

// Global variables
uint32_t freq = 7200000UL;      // Start at 7.2MHz
uint32_t freqold;
uint32_t fstep = 1000;          // Default step 1kHz
int16_t interfreq = IF_FREQ;
int16_t cal = XT_CAL_F;
uint8_t smval;
uint8_t encoder = 1;
uint8_t stp = 4;
uint8_t n = 1;
uint8_t count = BAND_INIT;
uint8_t prevCount = BAND_INIT;
uint8_t x, xo;
bool sts = 0;
bool displayOK = false;

// Function prototypes
bool setSi5351Frequency(Si5351& si5351, uint32_t freq, int16_t interfreq);
void check_inputs();
void update_display_paged();
void initializeSi5351();

// Encoder interrupt service routine
ISR(PCINT2_vect) {
  char result = r.process();
  if (result == DIR_CW) {
    if (encoder == 1) {
      uint32_t new_freq = freq + fstep;
      if (new_freq <= MAX_FREQ) {
        freq = new_freq;
        n = (n >= 42) ? 1 : n + 1;
      }
    }
  }
  else if (result == DIR_CCW) {
    if (encoder == 1) {
      uint32_t new_freq = freq;
      if (freq >= fstep) {
        new_freq = freq - fstep;
        if (new_freq >= MIN_FREQ) {
          freq = new_freq;
          n = (n <= 1) ? 42 : n - 1;
        }
      }
    }
  }
}

void setup() {
  Serial.begin(9600);
  Serial.println(F("VFO Starting..."));
  
  Wire.begin();
  
  if (!u8g2.begin()) {
    Serial.println(F("Display init failed!"));
    while (1) { delay(1000); }
  }
  
  // Display initialization test
  u8g2.setFont(u8g2_font_6x12_tr);
  u8g2.firstPage();
  do {
    u8g2.drawFrame(0, 0, 128, 64);
    u8g2.drawStr(20, 32, "Initializing...");
  } while (u8g2.nextPage());
  delay(1000);
  
  Serial.println(F("Display initialized"));
  displayOK = true;

  // Initialize pins
  pinMode(PIN_ROT_1, INPUT_PULLUP);
  pinMode(PIN_ROT_2, INPUT_PULLUP);
  pinMode(PIN_TUNESTEP, INPUT_PULLUP);
  pinMode(PIN_BAND, INPUT_PULLUP);
  pinMode(PIN_RX_TX, INPUT_PULLUP);

  // Initialize Si5351
  initializeSi5351();
  
  // Setup rotary encoder interrupts
  PCICR |= (1 << PCIE2);
  PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);
  sei();

  // Set initial frequency
  freq = pgm_read_dword(&FREQ_PRESETS[count - 1]);
  
  Serial.println(F("Setup complete"));
}

void initializeSi5351() {
  Serial.println(F("Initializing Si5351..."));
  if (!si5351.init(SI5351_CRYSTAL_LOAD_8PF, 0, 0)) {
    Serial.println(F("Si5351 init failed!"));
  }
  si5351.reset();
  delay(10);
  si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
  si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_8MA);
  si5351.output_enable(SI5351_CLK0, 1);
}

bool setSi5351Frequency(Si5351& si5351, uint32_t freq, int16_t interfreq) {
  // Check if frequency is within valid range
  if (freq < MIN_FREQ || freq > MAX_FREQ) {
    return false;
  }
  
  uint64_t output_freq = (freq + (interfreq * 1000ULL)) * 100ULL;
  
  // Handle GEN mode specially
  if (count == 1) {
    si5351.reset();
    delay(10);
    si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
    si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_8MA);
  }
  
  // Set the frequency
  si5351.set_freq(output_freq, SI5351_CLK0);
  si5351.output_enable(SI5351_CLK0, 1);
  
  return true;
}

void loop() {
  if (!displayOK) return;

  // Process frequency changes with error handling
  if (freqold != freq) {
    if (!setSi5351Frequency(si5351, freq, interfreq)) {
      // If frequency setting fails, try to recover
      si5351.reset();
      delay(10);
      si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
      si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_8MA);
      setSi5351Frequency(si5351, freq, interfreq);
    }
    freqold = freq;
  }

  // Check inputs
  check_inputs();
  
  // Update display
  update_display_paged();
  
  // Read signal meter
  smval = analogRead(PIN_ADC);
  x = constrain(map(smval, 0, S_GAIN, 1, 14), 1, 14);
}

void check_inputs() {
  if (digitalRead(PIN_TUNESTEP) == LOW) {
    stp = (stp % 6) + 1;
    fstep = pgm_read_dword(&FREQ_STEPS[stp - 1]);
    delay(300);
  }

  if (digitalRead(PIN_BAND) == LOW) {
    uint8_t newCount = (count % 21) + 1;
    
    // Reset Si5351 when entering or leaving GEN mode
    if (newCount == 1 || count == 1) {
      si5351.reset();
      delay(10);
      si5351.set_correction(cal, SI5351_PLL_INPUT_XO);
      si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_8MA);
      si5351.output_enable(SI5351_CLK0, 1);
    }
    
    count = newCount;
    freq = pgm_read_dword(&FREQ_PRESETS[count - 1]);
    prevCount = count;
    delay(300);
  }

  sts = (digitalRead(PIN_RX_TX) == LOW);
  interfreq = (sts || count == 1) ? 0 : IF_FREQ;
}

void update_display_paged() {
  u8g2.firstPage();
  do {
    // Display frequency
    char buffer[16];
    uint32_t m = freq / 1000000UL;
    uint32_t k = (freq % 1000000UL) / 1000UL;
    uint32_t h = (freq % 1000UL);
    
    u8g2.setFont(u8g2_font_10x20_tr);
    
    if (m < 1) {
      sprintf(buffer, "%03lu.%03lu", k, h);
      u8g2.drawStr(41, 17, buffer);
    } else if (m < 100) {
      sprintf(buffer, "%lu.%03lu.%03lu", m, k, h);
      u8g2.drawStr(15, 17, buffer);
    } else {
      sprintf(buffer, "%lu.%03lu.%03lu", m, k, h);
      u8g2.drawStr(15, 17, buffer);
    }
    
    // Draw interface elements
    u8g2.setFont(u8g2_font_6x12_tr);
    u8g2.drawHLine(0, 22, 128);
    u8g2.drawHLine(0, 45, 128);
    u8g2.drawHLine(15, 54, 67);
    u8g2.drawVLine(105, 26, 15);
    u8g2.drawVLine(87, 26, 15);
    u8g2.drawVLine(87, 50, 15);
    
    // Display RX/TX status
    u8g2.drawStr(91, 37, sts ? "TX" : "RX");
    
    // Display IF frequency
    sprintf(buffer, "IF:%d", interfreq);
    u8g2.drawStr(90, 59, buffer);
    
    // Display LO value
    sprintf(buffer, "LO:%d", interfreq);
    u8g2.drawStr(110, 38, buffer);
    
    // Display step
    u8g2.drawStr(54, 32, "STEP");
    switch(stp) {
      case 1: u8g2.drawStr(54, 42, "1MHz"); break;
      case 2: u8g2.drawStr(54, 42, "1Hz"); break;
      case 3: u8g2.drawStr(54, 42, "10Hz"); break;
      case 4: u8g2.drawStr(54, 42, "1kHz"); break;
      case 5: u8g2.drawStr(54, 42, "5kHz"); break;
      case 6: u8g2.drawStr(54, 42, "10kHz"); break;
    }
    
    // Display band name
    u8g2.setFont(u8g2_font_10x20_tr);
    strcpy_P(buffer, (char*)pgm_read_word(&(BAND_NAMES[count - 1])));
    u8g2.drawStr(0, 40, buffer);
    
    // Draw meters
    u8g2.setFont(u8g2_font_6x12_tr);
    byte y = map(n, 1, 42, 1, 14);
    
    u8g2.drawStr(0, 54, "TU");
    u8g2.drawBox(15 + (y-1)*5, 47, 2, 6);
    
    u8g2.drawStr(0, 63, "SM");
    for (byte i = 1; i <= x; i++) {
      u8g2.drawBox(15 + (i-1)*5, 57, 2, 6);
    }
    
  } while (u8g2.nextPage());
}

Documentation

Schematic

...

SchematicJPG.jpg

Comments

Only logged in users can leave comments

mircemk

46 Followers

•

44 Projects