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Projects Programming
19 
const int sensorPin = 12;  // TCRT5000 digital output
const int relayPin = 3;    // Relay control pin

int counter = 0;            // Counts down after last detection
const int countMax = 1000;  // Adjust to control how long relay stays ON (1000 ~ 1 second)

void setup() {
  pinMode(sensorPin, INPUT);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW);  // relay OFF initially
  Serial.begin(9600);
  counter = 0;
}

void loop() {
  // Sensor detects white patch (active LOW on many modules)
  if (digitalRead(sensorPin) == LOW) {
    counter = countMax;            // Reset counter whenever white patch detected
    digitalWrite(relayPin, HIGH);  // Relay ON
    Serial.println("Wheel moving → Relay ON");
  } else {
    // Countdown: relay stays ON for a short time even if sensor reads black
    if (counter > 0) {
      counter--;
      digitalWrite(relayPin, HIGH);  // Keep relay ON
    } else {
      digitalWrite(relayPin, LOW);  // Relay OFF
      Serial.println("Wheel stopped → Relay OFF");
    }
  }

  delay(1);  // Small delay for stability
}