#define GOOD_PIN 9
#define BAD_PIN 8
#define SPRAYER_GOOD 1
#define SPRAYER_BAD 9
int spray_id;

void setup() {
  pinMode(GOOD_PIN, OUTPUT);
  pinMode(BAD_PIN, OUTPUT);
  digitalWrite(GOOD_PIN, HIGH);
  digitalWrite(BAD_PIN, HIGH);
  
  Serial.begin(9600);
}

void activatePin(int pinNumber) {
 digitalWrite(pinNumber, LOW);
 delay(500);
 digitalWrite(pinNumber, HIGH); 
}

void spray(int spray_id) {
  if(spray_id == SPRAYER_GOOD) {
    activatePin(GOOD_PIN);
    Serial.println("spray good");
  } else if(spray_id == SPRAYER_BAD) {
    activatePin(BAD_PIN);
    Serial.println("spray bad");
  } else {
    Serial.println("WTF?");
  }
}

void loop() {
  if(Serial.available() > 0) {
    spray_id = Serial.read();
    Serial.print("got ");
    Serial.println(spray_id);
    
    spray(spray_id);
  }

}