#include <Wire.h>

int RedLED = 2; // AUX indicator
int GreenLED = 3; // BTL indicator
int YellowLED = 4; // Radio indicator

int AUX = 5; // AUX selector switch
int BTL = 6; // BTL selector switch
int RADIO = 7; // Radio selector switch

int CHAT = 50;

// Audio source control lines
int CTL_AUX = 8;
int CTL_BTL = 9;
int CTL_RADIO = 10;

void setup() {
  Serial.begin(9600);
  Serial.println("Audio selectro started.....");
  
  // Audio source selector indicator
  pinMode(RedLED, OUTPUT);
  pinMode(GreenLED, OUTPUT);
  pinMode(YellowLED, OUTPUT);
  
  // Tact switch
  pinMode(AUX, INPUT);
  pinMode(BTL, INPUT);
  pinMode(RADIO, INPUT);

  // Control line setting
  pinMode(CTL_AUX, OUTPUT);
  pinMode(CTL_BTL, OUTPUT);
  pinMode(CTL_RADIO, OUTPUT);
  
  for(int i=0;i<5;i++) {
      digitalWrite(RedLED, HIGH);
      delay(100);
      digitalWrite(RedLED, LOW);
      digitalWrite(GreenLED, HIGH);
      delay(100);
      digitalWrite(GreenLED, LOW);
      digitalWrite(YellowLED, HIGH);
      delay(100);
      digitalWrite(YellowLED, LOW);
  } 

  // Initial status turn on all LEDs
  digitalWrite(RedLED, HIGH);
  digitalWrite(GreenLED, HIGH);
  digitalWrite(YellowLED, HIGH);

  // Initial control lines are low
  digitalWrite(CTL_AUX, LOW);
  digitalWrite(CTL_BTL, LOW);
  digitalWrite(CTL_RADIO, LOW);
}

void loop() {
  
  do {
    if (digitalRead(AUX) == HIGH) {
      delay(CHAT);
      if (digitalRead(AUX) == HIGH) {
        // Indicator LED control
        digitalWrite(RedLED, HIGH);
        digitalWrite(GreenLED, LOW);
        digitalWrite(YellowLED, LOW);  

        // Aux channel selected
        digitalWrite(CTL_BTL, LOW);
        digitalWrite(CTL_RADIO, LOW);
        delay(1000);
        digitalWrite(CTL_AUX, HIGH);
      }
    }
    if (digitalRead(BTL) == HIGH) {
      delay(CHAT);
      if (digitalRead(BTL) == HIGH) {
        digitalWrite(RedLED, LOW);
        digitalWrite(GreenLED, HIGH);
        digitalWrite(YellowLED, LOW);  
      }

      // Aux channel selected
      digitalWrite(CTL_AUX, LOW);
      delay(1000);
      digitalWrite(CTL_RADIO, LOW);
      delay(1000);
      digitalWrite(CTL_BTL, HIGH);
    }
    if (digitalRead(RADIO) == HIGH) {
      delay(CHAT);
      if (digitalRead(RADIO) == HIGH) {
        digitalWrite(RedLED, LOW);
        digitalWrite(GreenLED, LOW);
        digitalWrite(YellowLED, HIGH);  
      }

      // Aux channel selected
      digitalWrite(CTL_AUX, LOW);
      delay(1000);
      digitalWrite(CTL_BTL, LOW);
      delay(1000);
      digitalWrite(CTL_RADIO, HIGH);
    }
  } while(1);
}