Trivial crossband repeater controller

repeater-controller.ino

/*
 * Trivial crossband repeater controller
 * Yaesu FT-1500m to Baofeng with carrier detect pin brought out
 * 
 * 1k resistor to NPN transistor base on D5 and D6
 * Baofeng PTT pin to D5 transistor collector
 * Yaesu data port PTT pin to D6 transistor collector
 * FT-1500m data port SQL line to A0
 * Baofeng CD line to A1
 * 
 * FT-1500m speaker output pin to Baofeng mic in
 * Baofeng audio out to Yaesu mic jack audio in pin (data jack audio in does not seem flat)
 */
int yaesuSqlSensorPin = A0;    // select the input pin for the potentiometer
int yaesuSqlSensorValue = 0;  // variable to store the value coming from the sensor

int baofengSqlSensorPin = A1;    // select the input pin for the potentiometer
int baofengSqlSensorValue = 0;  // variable to store the value coming from the sensor

const int yaesuSqlThreshold=200;
const int baofengSqlThreshold=50;

void setup() {
  
  Serial.begin(9600);
  
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  
  digitalWrite(yaesuSqlSensorPin, INPUT_PULLUP);
  digitalWrite(baofengSqlSensorPin, INPUT_PULLUP);
}

bool baofengPtt = false;
bool yaesuPtt = false;

void loop() {
  // read the value from the sensor:
  yaesuSqlSensorValue = analogRead(yaesuSqlSensorPin);
  baofengSqlSensorValue = analogRead(baofengSqlSensorPin);
  
  if (true){
    if (yaesuSqlSensorValue > yaesuSqlThreshold && !baofengPtt){
      Serial.println("Keying up Baofeng");
      baofengPtt = true;
      digitalWrite(5,true);
    } else if (yaesuSqlSensorValue < yaesuSqlThreshold && baofengPtt){
      Serial.println("Baofeng PTT off");
      baofengPtt = false;
      digitalWrite(5,false);
    }

    if (baofengSqlSensorValue < baofengSqlThreshold && !yaesuPtt){
      Serial.println("Keying up Yaesu");
      yaesuPtt = true;
      digitalWrite(6,true);
    } else if (baofengSqlSensorValue > baofengSqlThreshold && yaesuPtt){
      Serial.println("Yaesu PTT off");
      yaesuPtt = false;
      digitalWrite(6,false);
    }
  } else {
    Serial.println(baofengSqlSensorValue);
    delay(200);
  }
  
}