const int greenBtn = 13;
const int yellowBtn = 12;
const int blackBtn = 11;
void setup() {
  // put your setup code here, to run once:
  pinMode(greenBtn, INPUT);
  pinMode(yellowBtn, INPUT);
  pinMode(4, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int state= digitalRead(greenBtn);
  Serial.println(state);
  if(state == 1){
    digitalWrite(4, 1);
    analogWrite(5, 1);
  }
}