const int motionSensor = 2; // Motion sensor pin
const int relayPin = 3;     // Digital pin connected to the relay module
const int pumpOnTime = 1000; // Pump on time in milliseconds (1 second)

unsigned long pumpStartTime = 0; // Variable to store the pump start time
bool pumpIsRunning = false;      // Flag to indicate if the pump is running

void setup() {
  pinMode(motionSensor, INPUT);
  pinMode(relayPin, OUTPUT);
}

void loop() {
  int motionDetected = digitalRead(motionSensor);

  if (motionDetected == HIGH && !pumpIsRunning) {
    // Motion detected and pump is not already running
    pumpStartTime = millis();
    digitalWrite(relayPin, HIGH); // Turn on the relay
    pumpIsRunning = true;
  }

  if (pumpIsRunning && millis() - pumpStartTime >= pumpOnTime) {
    digitalWrite(relayPin, LOW); // Turn off the relay
    pumpIsRunning = false; // Reset the pump running flag
  }
}