launcher.ino

const int R8 = 7; // top left
const int R4 = 6; // top right

const int LEDR = 8;
const int LEDG = 10;
const int LEDB = 9;

void setRGB(int r, int g, int b) {
  digitalWrite(LEDR, r);
  digitalWrite(LEDG, g);
  digitalWrite(LEDB, b);
}

void setup() {
  
  pinMode(5, OUTPUT); // always on
  digitalWrite(5, HIGH);
  
  pinMode(R8, OUTPUT);
  digitalWrite(R8, HIGH);
  pinMode(R4, OUTPUT);
  digitalWrite(R4, HIGH);

  pinMode(LEDR, OUTPUT);
  pinMode(LEDG, OUTPUT);
  pinMode(LEDB, OUTPUT);

  setRGB(0, 1, 0);

  Serial.begin(9600);
  Serial.write("start");
}

void loop() {
  while (Serial.available() > 0) {
      int v = Serial.parseInt();
      if (Serial.read() == '\n') {
          Serial.print("Ok ");
          Serial.println(v);

          // anti self-destruct
          if (v < 5000) {
            // red light
            setRGB(1, 0, 0);

            // relay on
            digitalWrite(R4, LOW);
            
            delay(v);
            
            // relay off
            digitalWrite(R4, HIGH);

            // green light
            setRGB(0, 1, 0);
          }
      }
  }
}