CoinSlotSolenoid

#define coinSlotPin 2
#define coinsValue = coins
#define solenoidPin 3
#define ledPinRed 4
#define ledPinGreen 5

volatile int coins = -1;
int lastCoinCount = 0;



byte delayTime = 5;
int timeDelay  = 1000 * delayTime;

void setup() {
  // Open serial communications and wait for port to open:
  pinMode(ledPinRed, OUTPUT);
  pinMode(ledPinGreen, OUTPUT);
  pinMode(solenoidPin, OUTPUT);
  digitalWrite(solenoidPin, LOW);
  Serial.begin(9600);

  digitalWrite(ledPinRed, LOW);
  digitalWrite(ledPinGreen, HIGH);
  pinMode(coinSlotPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(coinSlotPin), coinInserted, FALLING);
  coins = 0;

}

void loop() {
  Serial.println(coins);

  if (coins >= 1) //dito papalitan yung coins na need
  {
    digitalWrite(ledPinRed, HIGH);
    digitalWrite(ledPinGreen, LOW);
    digitalWrite(solenoidPin, HIGH);
    delay(timeDelay);
    digitalWrite(ledPinGreen, HIGH);
    digitalWrite(ledPinRed, LOW);
    digitalWrite(solenoidPin, LOW);
    coins = 0;
  }
}

void coinInserted() {
  coins++;

}