Amateur radio remote aerial switching unit

A BCD switch controller based on Arduino Nano for remote control of RF relays with LCD display and EEPROM power off saving of settings.

Jul 6, 2021

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communication

remote control

Devices & Components

Arduino Nano

Project description

Code

Aerial Switch Controller Software

c_cpp

Code is designed to toggle up and down between pages of text on LCD screen, and generate a 3bit BCD output for the page selected and store the selected page to EEPROM. Thus after power down, on the next reboot the system will restart with the last setting. Using port connections to an Arduino NANO as per the schematic this code can be used to drive a remote BCD decoder for selecting remote RF relays. LCD displays antenna selected with 16 characters available for description. First line of display can be used for station callsign and Maidenhead locator. System settings are only saved to eeprom when changing the antenna selection thus write cycles are kept to a minimum and not for each program loop. A test for eeprom value is included at the end of the program loop to ensure the returned value is within the scope of this program.

1//Antenna switch control software Issue-1
2//description, antenna relay  switch controller with LCD display display using 3 wire [binary] control to switch  up to 6 remote RF relays. Requires ATmega328P-PU (Arduino Nano), 1x SPDT toggle  switch [mom-off-mom] and either I2C 16x2 or 20x4 LCD module
3//display information  and relay switch driver(s) are stored in EEPROM and recalled on power rebootA
4//Added  test for EEPROM corruption, code lines 203 204..
5//David Allen G8LHD © 22nd June  2021
6
7#include <EEPROM.h>
8#include <Wire.h> 
9#include <LiquidCrystal_I2C.h>  //library installation required from GitHub
10
11// * Download LiquidCrystal_I2C  zipped library from GitHub  https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
12//  * install in Arduino > libraries > new folder "LiquidCrystal_I2C"
13// * After  placing in folder run Arduino IDE software, Sketch > Include Library > Add.ZIP Library...
14//  * May be necessary to reboot Arduino IDE software after library installation
15//  * Change text strings in following lines of code to your own preferences
16// *  Line56, declare lcd type, 16 x 2 line default or 20 character x 4 line alternative.
17//  * Line80, add station call sign
18// * Line131; add antenna description, NOTE fill  LCD text string statement with spaces to stop LCD overlap of text string.
19//  * Line142; add antenna description
20// * Line152; add antenna description
21//  * Line162; add antenna description
22// * Line172; add antenna description
23//  * Line182; add antenna description
24// * code lines 91 "if(page_counter <7)"  and code line 110 "page_counter= 7;" the number used reflects the highest page  number if not using all antenna ports, binary address '110' is used on last page,  all relays off.
25
26
27//-------Pins-----//
28int up = 2;        //Up button,   digital pin2, PD2 ATmega328P 28pin dip = pin4, normally open = LOW, closed =  HIGH
29int down = 3;      //Down button, digital pin3, PD3 ATmega328P 28pin dip  = pin5, normally open = LOW, closed = HIGH
30int outputA0 = 14; //A0, digital pin14,  ATmega328P 28pin dip = pin23
31int outputA1 = 15; //A1, digital pin15, ATmega328P  28pin dip = pin24
32int outputA2 = 16; //A2, digital pin16, ATmega328P 28pin dip  = pin25
33
34//----variable to move between pages----//
35int page_counter;       
36     
37//---------Storage debounce function-----//
38bool current_up = LOW;          
39bool  last_up=LOW;            
40bool last_down = LOW;
41bool current_down = LOW;
42
43void  setup() {
44
45checkpagecounterState(); //----Check last EEPROM stored page count----//
46
47pinMode(up,INPUT);         //initialize digital pin PD2 as an input.
48pinMode(down,INPUT);       //initialize  digital pin PD3 as an input.
49pinMode(outputA0,OUTPUT);  //initialize analogue  pin A0 as an output.
50pinMode(outputA1,OUTPUT);  //initialize analogue pin A1  as an output.
51pinMode(outputA2,OUTPUT);  //initialize analogue pin A2 as an output.
52
53//----Check  0x27 is correct I2C address for LCD display----//
54 
55LiquidCrystal_I2C lcd(0x27,  16, 2);       // LiquidCrystal_I2C lcd(0x27, 20, 4); // use with 4 line LCD display
56lcd.init();                               // Initialize the LCD
57lcd.backlight();                          //  turn on backlight
58lcd.clear();                              // clear display
59}
60
61//----De-bouncing  function for all buttons----//
62boolean debounce(boolean last, int pin)
63{
64boolean  current = digitalRead(pin);
65if (last != current)
66{
67delay(40);  //----40ms  delay for debounce----//
68current = digitalRead(pin);
69}
70return current;
71}
72
73void  loop() {
74
75
76LiquidCrystal_I2C lcd(0x27, 20, 4); //this is required inside  loop for lcd.functions to work
77    lcd.backlight();
78    lcd.setCursor(0,0);  //----indent one charachter, line 0----//
79    lcd.print("Gxxxx Loc xxxxxx");          //write station callsign and Maidenhead grid square locator on first line  of LCD display
80//  lcd.print("1234567812345678");    Character number guide  for 16 x 2 LCD display
81current_up = debounce(last_up, up);         //Debounce  for Up button
82current_down = debounce(last_down, down);   //Debounce for Down  button
83
84//----Page counter function to move between pages----//
85//----change  code lines 91 "if(page_counter <7)" and code line 110 "page_counter= 7;" replace  7 with highest number of pages----//
86
87//Page Up
88    if (last_up== LOW &&  current_up == HIGH){ 
89      lcd.clear();                     //When page is changed,  lcd clear to print new page   
90      if(page_counter <7){             //Page  counter never higher than 7(total of pages)
91      page_counter= page_counter  +1;   //Page up
92      
93      }
94      else{
95      page_counter= 1;                //return  to page 1
96      }
97  }
98
99    last_up = current_up;
100
101//Page Down
102    if (last_down== LOW && current_down == HIGH){
103      lcd.clear();                     //When  page is changed, lcd clear to print new page    
104      if(page_counter >1){             //Page  counter never lower than 1 (total of pages)
105      page_counter= page_counter  -1;   //Page down
106      
107      }
108      else{
109      page_counter= 7;              //----return to page 7----//
110      }
111  }
112    
113    last_down  = current_down;
114
115
116EEPROM.update(0, page_counter); //----write to ATmega328  EEPROM adress 0, page_counter variable (1-7)----//
117
118
119
120    
121//----Aerial  Switch function----//
122
123  switch (page_counter) {
124   
125    case 1:{     //Design  of home page 1
126    digitalWrite(outputA0,LOW); //----antenna port address 000,  A0 least significant bit----//
127    digitalWrite(outputA1,LOW);
128    digitalWrite(outputA2,LOW);
129    lcd.setCursor(0,1);
130    lcd.print("A 6m/2m/70c Vert");
131//  lcd.print("1234567812345678");    Character number guide for 16 x 2 LCD display
132    }
133    break;
134
135
136    case 2: { //Design of page 2 
137    digitalWrite(outputA0,HIGH); //----antenna  port address 001, A0 least significant bit----//
138    digitalWrite(outputA1,LOW);
139    digitalWrite(outputA2,LOW);
140    lcd.setCursor(0,1);  //indent one charachter,  print on line 1
141    lcd.print("B 144MHz 2m Horz");
142//  lcd.print("1234567812345678");   
143    }
144    break;
145
146    case 3: {   //Design of page 3 
147    digitalWrite(outputA0,LOW);  //----antenna port address 010, A0 least significant bit----//
148    digitalWrite(outputA1,HIGH);
149    digitalWrite(outputA2,LOW);
150    lcd.setCursor(0,1);
151    lcd.print("C  50MHz 6m Horz ");
152//  lcd.print("1234567812345678");      
153    }
154    break;
155
156    case 4: {   //Design of page 4
157    digitalWrite(outputA0,HIGH); //----antenna  port address 011, A0 least significant bit----//
158    digitalWrite(outputA1,HIGH);
159    digitalWrite(outputA2,LOW);
160    lcd.setCursor(0,1);
161    lcd.print("                ");
162//  lcd.print("1234567812345678");    
163    }
164    break;
165
166    case 5:  {   //Design of page 5
167    digitalWrite(outputA0,LOW); //----antenna port address  100, A0 least significant bit----//
168    digitalWrite(outputA1,LOW);
169    digitalWrite(outputA2,HIGH);
170    lcd.setCursor(0,1);
171    lcd.print("                "); 
172//  lcd.print("1234567812345678");    
173    }
174    break;
175
176    case 6: {   //Design of page 6
177    digitalWrite(outputA0,HIGH);  //----antenna port address 101, A0 least significant bit----//
178    digitalWrite(outputA1,LOW);
179    digitalWrite(outputA2,HIGH);
180    lcd.setCursor(0,1);
181    lcd.print("                ");
182//  lcd.print("1234567812345678");    
183    }
184    break;
185
186    case 7: {   //Design of page 7
187    digitalWrite(outputA0,LOW); //----unused  antenna port address 110, A0 least significant bit, all relays off.----//
188    digitalWrite(outputA1,HIGH);
189    digitalWrite(outputA2,HIGH);
190    lcd.setCursor(0,1);
191    lcd.print("All  relays off  ");
192//  lcd.print("1234567812345678");
193    }
194    break;
195
196  }//switch end
197
198}//1st loop end
199
200void checkpagecounterState() //----program  loop for reading EEPROM adress 0 pagecounter last stored value----//
201{
202  page_counter  = EEPROM.read(0);
203if (page_counter <1)return 1; //if eeprom value becomes corrupted  returns a page_counter value of page 1
204if (page_counter >7) return 1;
205
206}//2nd  loop end
207
208
209
210
211//end

//Antenna switch control software Issue-1
//description, antenna relay  switch controller with LCD display display using 3 wire [binary] control to switch  up to 6 remote RF relays. Requires ATmega328P-PU (Arduino Nano), 1x SPDT toggle  switch [mom-off-mom] and either I2C 16x2 or 20x4 LCD module
//display information  and relay switch driver(s) are stored in EEPROM and recalled on power rebootA
//Added  test for EEPROM corruption, code lines 203 204..
//David Allen G8LHD © 22nd June  2021

#include <EEPROM.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>  //library installation required from GitHub

// * Download LiquidCrystal_I2C  zipped library from GitHub  https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
//  * install in Arduino > libraries > new folder "LiquidCrystal_I2C"
// * After  placing in folder run Arduino IDE software, Sketch > Include Library > Add.ZIP Library...
//  * May be necessary to reboot Arduino IDE software after library installation
//  * Change text strings in following lines of code to your own preferences
// *  Line56, declare lcd type, 16 x 2 line default or 20 character x 4 line alternative.
//  * Line80, add station call sign
// * Line131; add antenna description, NOTE fill  LCD text string statement with spaces to stop LCD overlap of text string.
//  * Line142; add antenna description
// * Line152; add antenna description
//  * Line162; add antenna description
// * Line172; add antenna description
//  * Line182; add antenna description
// * code lines 91 "if(page_counter <7)"  and code line 110 "page_counter= 7;" the number used reflects the highest page  number if not using all antenna ports, binary address '110' is used on last page,  all relays off.


//-------Pins-----//
int up = 2;        //Up button,   digital pin2, PD2 ATmega328P 28pin dip = pin4, normally open = LOW, closed =  HIGH
int down = 3;      //Down button, digital pin3, PD3 ATmega328P 28pin dip  = pin5, normally open = LOW, closed = HIGH
int outputA0 = 14; //A0, digital pin14,  ATmega328P 28pin dip = pin23
int outputA1 = 15; //A1, digital pin15, ATmega328P  28pin dip = pin24
int outputA2 = 16; //A2, digital pin16, ATmega328P 28pin dip  = pin25

//----variable to move between pages----//
int page_counter;       
     
//---------Storage debounce function-----//
bool current_up = LOW;          
bool  last_up=LOW;            
bool last_down = LOW;
bool current_down = LOW;

void  setup() {

checkpagecounterState(); //----Check last EEPROM stored page count----//

pinMode(up,INPUT);         //initialize digital pin PD2 as an input.
pinMode(down,INPUT);       //initialize  digital pin PD3 as an input.
pinMode(outputA0,OUTPUT);  //initialize analogue  pin A0 as an output.
pinMode(outputA1,OUTPUT);  //initialize analogue pin A1  as an output.
pinMode(outputA2,OUTPUT);  //initialize analogue pin A2 as an output.

//----Check  0x27 is correct I2C address for LCD display----//
 
LiquidCrystal_I2C lcd(0x27,  16, 2);       // LiquidCrystal_I2C lcd(0x27, 20, 4); // use with 4 line LCD display
lcd.init();                               // Initialize the LCD
lcd.backlight();                          //  turn on backlight
lcd.clear();                              // clear display
}

//----De-bouncing  function for all buttons----//
boolean debounce(boolean last, int pin)
{
boolean  current = digitalRead(pin);
if (last != current)
{
delay(40);  //----40ms  delay for debounce----//
current = digitalRead(pin);
}
return current;
}

void  loop() {


LiquidCrystal_I2C lcd(0x27, 20, 4); //this is required inside  loop for lcd.functions to work
    lcd.backlight();
    lcd.setCursor(0,0);  //----indent one charachter, line 0----//
    lcd.print("Gxxxx Loc xxxxxx");          //write station callsign and Maidenhead grid square locator on first line  of LCD display
//  lcd.print("1234567812345678");    Character number guide  for 16 x 2 LCD display
current_up = debounce(last_up, up);         //Debounce  for Up button
current_down = debounce(last_down, down);   //Debounce for Down  button

//----Page counter function to move between pages----//
//----change  code lines 91 "if(page_counter <7)" and code line 110 "page_counter= 7;" replace  7 with highest number of pages----//

//Page Up
    if (last_up== LOW &&  current_up == HIGH){ 
      lcd.clear();                     //When page is changed,  lcd clear to print new page   
      if(page_counter <7){             //Page  counter never higher than 7(total of pages)
      page_counter= page_counter  +1;   //Page up
      
      }
      else{
      page_counter= 1;                //return  to page 1
      }
  }

    last_up = current_up;

//Page Down
    if (last_down== LOW && current_down == HIGH){
      lcd.clear();                     //When  page is changed, lcd clear to print new page    
      if(page_counter >1){             //Page  counter never lower than 1 (total of pages)
      page_counter= page_counter  -1;   //Page down
      
      }
      else{
      page_counter= 7;              //----return to page 7----//
      }
  }
    
    last_down  = current_down;


EEPROM.update(0, page_counter); //----write to ATmega328  EEPROM adress 0, page_counter variable (1-7)----//



    
//----Aerial  Switch function----//

  switch (page_counter) {
   
    case 1:{     //Design  of home page 1
    digitalWrite(outputA0,LOW); //----antenna port address 000,  A0 least significant bit----//
    digitalWrite(outputA1,LOW);
    digitalWrite(outputA2,LOW);
    lcd.setCursor(0,1);
    lcd.print("A 6m/2m/70c Vert");
//  lcd.print("1234567812345678");    Character number guide for 16 x 2 LCD display
    }
    break;


    case 2: { //Design of page 2 
    digitalWrite(outputA0,HIGH); //----antenna  port address 001, A0 least significant bit----//
    digitalWrite(outputA1,LOW);
    digitalWrite(outputA2,LOW);
    lcd.setCursor(0,1);  //indent one charachter,  print on line 1
    lcd.print("B 144MHz 2m Horz");
//  lcd.print("1234567812345678");   
    }
    break;

    case 3: {   //Design of page 3 
    digitalWrite(outputA0,LOW);  //----antenna port address 010, A0 least significant bit----//
    digitalWrite(outputA1,HIGH);
    digitalWrite(outputA2,LOW);
    lcd.setCursor(0,1);
    lcd.print("C  50MHz 6m Horz ");
//  lcd.print("1234567812345678");      
    }
    break;

    case 4: {   //Design of page 4
    digitalWrite(outputA0,HIGH); //----antenna  port address 011, A0 least significant bit----//
    digitalWrite(outputA1,HIGH);
    digitalWrite(outputA2,LOW);
    lcd.setCursor(0,1);
    lcd.print("                ");
//  lcd.print("1234567812345678");    
    }
    break;

    case 5:  {   //Design of page 5
    digitalWrite(outputA0,LOW); //----antenna port address  100, A0 least significant bit----//
    digitalWrite(outputA1,LOW);
    digitalWrite(outputA2,HIGH);
    lcd.setCursor(0,1);
    lcd.print("                "); 
//  lcd.print("1234567812345678");    
    }
    break;

    case 6: {   //Design of page 6
    digitalWrite(outputA0,HIGH);  //----antenna port address 101, A0 least significant bit----//
    digitalWrite(outputA1,LOW);
    digitalWrite(outputA2,HIGH);
    lcd.setCursor(0,1);
    lcd.print("                ");
//  lcd.print("1234567812345678");    
    }
    break;

    case 7: {   //Design of page 7
    digitalWrite(outputA0,LOW); //----unused  antenna port address 110, A0 least significant bit, all relays off.----//
    digitalWrite(outputA1,HIGH);
    digitalWrite(outputA2,HIGH);
    lcd.setCursor(0,1);
    lcd.print("All  relays off  ");
//  lcd.print("1234567812345678");
    }
    break;

  }//switch end

}//1st loop end

void checkpagecounterState() //----program  loop for reading EEPROM adress 0 pagecounter last stored value----//
{
  page_counter  = EEPROM.read(0);
if (page_counter <1)return 1; //if eeprom value becomes corrupted  returns a page_counter value of page 1
if (page_counter >7) return 1;

}//2nd  loop end




//end

Downloadable files

Aerial Switch Controller

Connections to Nano board and output line driver details

Aerial Switch Controller

BCD decoder - relay driver

Decodes BCD to drive individual relays with high current drive outputs.

BCD decoder - relay driver

Decodes BCD to drive individual relays with high current drive outputs.

BCD decoder - relay driver

Aerial Switch Controller

Connections to Nano board and output line driver details

Aerial Switch Controller

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