#define ir_pin A2
#define pump 3
#define alarm 4

void setup() {
  pinMode(pump, OUTPUT);
  pinMode(alarm, OUTPUT);
}

void loop() {
  int ir = analogRead(ir_pin);
  if (ir > 400) {
    digitalWrite(pump, HIGH);  
    digitalWrite(alarm, HIGH); 
  } 
  else {
    digitalWrite(pump, LOW);  
    digitalWrite(alarm, LOW);   
  }
}