int signal1[] = {23, 25, 27};
int signal2[] = {46, 48, 50};
int signal3[] = {13, 12, 11};
int signal4[] = {10, 9, 8};
int testTimer = 1000;
int redDelay = 5000;
int yellowDelay = 3000;
int walkTimer = 5000;

const int interruptPin18 = 18;//trigger pins are 2, 3, 18, 19, 20, 21
volatile bool isButtonPressed = false;

void ledTesting()
{
 for (int i = 0; i < 3 ; i= i+1)   
  {   
    digitalWrite(signal1[i], HIGH);
    digitalWrite(signal2[i], HIGH);
    digitalWrite(signal3[i], HIGH);
    digitalWrite(signal4[i], HIGH);
    //
    digitalWrite(signal1[i], LOW);
    digitalWrite(signal2[i], LOW);
    digitalWrite(signal3[i], LOW);
    digitalWrite(signal4[i], LOW);
    delay(testTimer);

  } 
}
//all red leds
void allRedLEDs()
{
    isButtonPressed = false;
    digitalWrite(signal1[0], HIGH);
    digitalWrite(signal2[0], HIGH);
    digitalWrite(signal3[0], HIGH);
    digitalWrite(signal4[0], HIGH);
    //
    digitalWrite(signal1[1], LOW);
    digitalWrite(signal2[1], LOW);
    digitalWrite(signal3[1], LOW);
    digitalWrite(signal4[1], LOW);
    //
    digitalWrite(signal1[2], LOW);
    digitalWrite(signal2[2], LOW);
    digitalWrite(signal3[2], LOW);
    digitalWrite(signal4[2], LOW);
    delay(walkTimer);
}
void pushButtonInputFunction()
{
//do our programming

isButtonPressed = true;
}

void setup() 
{
  // Declaring all the LED's as output
  for (int i = 0; i < 3; i++) {
    pinMode(signal1[i], OUTPUT);
    pinMode(signal2[i], OUTPUT);
    pinMode(signal3[i], OUTPUT);
    pinMode(signal4[i], OUTPUT);
  }
  ledTesting();
  //
   pinMode(interruptPin18, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(interruptPin18), pushButtonInputFunction, LOW);
}
void loop() {
  // Making Green  LED at signal 1 and Signal 3 red LED's at other signal HIGH
  digitalWrite(signal1[2], HIGH);
  digitalWrite(signal1[0], LOW);
  digitalWrite(signal2[0], HIGH);
  digitalWrite(signal3[2], HIGH);
  digitalWrite(signal3[0], LOW);
  digitalWrite(signal4[0], HIGH);
  delay(redDelay);

  // Making Green LED at signal 1 LOW and signal 3 making yellow LED at signal 1 HIGH for 3 seconds
  digitalWrite(signal1[1], HIGH);
  digitalWrite(signal1[2], LOW);
  digitalWrite(signal3[1], HIGH);
  digitalWrite(signal3[2], LOW);
  delay(yellowDelay);
  digitalWrite(signal1[1], LOW);
  digitalWrite(signal3[1], LOW);

  // Making Green  LED at signal 2 and signal 4 red LED's at other signal HIGH
  digitalWrite(signal1[0], HIGH);
  digitalWrite(signal2[2], HIGH);
  digitalWrite(signal2[0], LOW);
  digitalWrite(signal3[0], HIGH);
  digitalWrite(signal4[2], HIGH);
  digitalWrite(signal4[0], LOW);
  delay(redDelay);

  // Making Green LED at signal 2 LOW and signal 4 making yellow LED at signal 2 HIGH for 3 seconds
  digitalWrite(signal2[1], HIGH);
  digitalWrite(signal2[2], LOW);
  digitalWrite(signal4[1], HIGH);
  digitalWrite(signal4[2], LOW);
  delay(yellowDelay);
  digitalWrite(signal2[1], LOW);
  digitalWrite(signal4[1], LOW);

  // Making Green  LED at signal 3 and signal 1 red LED's at other signal HIGH
  digitalWrite(signal1[2], HIGH);
  digitalWrite(signal1[0], LOW);
  digitalWrite(signal2[0], HIGH);
  digitalWrite(signal3[2], HIGH);
  digitalWrite(signal3[0], LOW);
  digitalWrite(signal4[0], HIGH);
  delay(redDelay);

  // Making Green LED at signal 3 LOW and signal 1 making yellow LED at signal 1 HIGH for 3 seconds
  digitalWrite(signal1[1], HIGH);
  digitalWrite(signal1[2], LOW);
  digitalWrite(signal3[1], HIGH);
  digitalWrite(signal3[2], LOW);
  delay(yellowDelay);
  digitalWrite(signal1[1], LOW);
  digitalWrite(signal3[1], LOW);


  
  // Making Green  LED at signal 2 and signal 4 red LED's at other signal HIGH
  digitalWrite(signal1[0], HIGH);
  digitalWrite(signal2[2], HIGH);
  digitalWrite(signal2[0], LOW);
  digitalWrite(signal3[0], HIGH);
  digitalWrite(signal4[2], HIGH);
  digitalWrite(signal4[0], LOW);
  delay(redDelay);

  // Making Green LED at signal 2 LOW and signal 4 making yellow LED at signal 2 HIGH for 3 seconds
  digitalWrite(signal2[1], HIGH);
  digitalWrite(signal2[2], LOW);
  digitalWrite(signal4[1], HIGH);
  digitalWrite(signal4[2], LOW);
  delay(yellowDelay);
  digitalWrite(signal4[1], LOW);
  digitalWrite(signal2[1], LOW);
// button testing
  if(isButtonPressed == true)
  {
    allRedLEDs();
    }
}