Simplex repeater with voice-module, Arduino and Dorji UHF RTX

This is the code for my simplex "parrot" repeater, based on a voice module "ISD 1820", a "DRA818U" transceiver module and an "Arduino" controler.

[code]
int PTT = 13;
int REC = 2;
int PLAY = 8;
int PTTLED = 11;
int RECLED = 10;
const int SQ = 6;

long startTime;
long duration;

void setup()
{
 pinMode(PTT, OUTPUT);
 digitalWrite(PTT, HIGH);  //pullUp
 pinMode(REC, OUTPUT);
 pinMode(PLAY, OUTPUT);
 pinMode(PTTLED, OUTPUT);
 pinMode(RECLED, OUTPUT);
 pinMode(SQ, INPUT);
 digitalWrite(SQ, HIGH);  //pullUp
}

void loop()
{
  if(digitalRead(SQ) == HIGH)
  {digitalWrite(REC, LOW);
  digitalWrite(RECLED, LOW);
  digitalWrite(PLAY, LOW);
  delay (25);}

  if(digitalRead(SQ) == LOW)
  {digitalWrite(REC, HIGH);
  digitalWrite(RECLED, HIGH);}

 if(digitalRead(SQ) == LOW)
 {
startTime = millis();
while(digitalRead(SQ) == LOW);
long duration = millis() - startTime;

digitalWrite(REC, LOW);
digitalWrite(RECLED, LOW);
delay (25);
       
 digitalWrite (PTT, LOW);
 digitalWrite(PTTLED, HIGH);
 delay (500);
 digitalWrite(PLAY, HIGH);
 delay (100);
 digitalWrite(PLAY, LOW);
 delay (duration);
 digitalWrite (PTT, HIGH);
 digitalWrite(PTTLED, LOW);
 }
 }
 
[/code]

 

Code by IN3RAY