// Yo, Yo, yo, Yo, yo, here's my code for the water pump!
//Red LED is in place of water pump on this diagram
// Connect Sensor IR Sensor + to 5v, and IR Sensor - to arduino GND
// Connect Relay VCC to 5v, and Relay GND to arduino GND
// Connect Water Pump + to NO on Relay, Connect Power (battery or power cable) to COM on Relay
// Connect Water Pump - to battery - , power cable - or Arduino GND

int relay = 13;                // Connect Relay IN to
int sensor = 2;              // Connect Sensor D to
int state = LOW;             // by default, no motion detected by Sensor
int val = 0;                 // variable to store the sensor status (value)

void setup() {
  pinMode(relay, OUTPUT);      // initalize relay as the output
  pinMode(sensor, INPUT);    // initialize sensor as the input
  Serial.begin(9600);        // initialize serial
}

void loop(){
  val = digitalRead(sensor);   // read sensor value
  if (val == HIGH) {           // check if the sensor is HIGH
    digitalWrite(relay, HIGH);   // activate relay
    delay(100);                // delay 100 milliseconds 
    
    if (state == LOW) {
      Serial.println("Motion detected, Pump On!"); 
      state = HIGH;       // update variable state to HIGH
    }
  } 
  else {
      digitalWrite(relay, LOW); // activate relay
      delay(100);             // delay 100 milliseconds 
      
      if (state == HIGH){
        Serial.println("Motion stopped, Pump Off!");
        state = LOW;       // update variable state to LOW
    }
  }
}