const int EUR_010 = 2;
const int EUR_020 = 3;
const int EUR_050 = 4;
const int EUR_100 = 5;
const int EUR_200 = 6;
float i = 0;
const int NEW_LINE = 10;

void setup() {
  Serial.begin(9600);
  pinMode(EUR_010, OUTPUT);
  pinMode(EUR_020, OUTPUT);
  pinMode(EUR_050, OUTPUT);
  pinMode(EUR_100, OUTPUT);
  pinMode(EUR_200, OUTPUT);
}

void loop() {
  Serial.println("loops");
  delay(1000);

  if (Serial.available() > 0) {
    String command = Serial.readStringUntil(NEW_LINE);
    parsePcCommand(command);
  }
}

void parsePcCommand(String command){
  if(command.equals("EJECT 010")){
    ejectCoin(EUR_010);
  }else if(command.equals("EJECT 020")){
    ejectCoin(EUR_020);
  }else if(command.equals("EJECT 050")){
    ejectCoin(EUR_050);
  }else if(command.equals("EJECT 100")){
    ejectCoin(EUR_100);
  }else if(command.equals("EJECT 200")){
    ejectCoin(EUR_200);
  }else if(command.equals("EJECT EACH")){
    Serial.println("ejecting all coins, 1 at a time...");
    parsePcCommand("EJECT 200");
    parsePcCommand("EJECT 100");
    parsePcCommand("EJECT 050");
    parsePcCommand("EJECT 020");
    parsePcCommand("EJECT 010");
    Serial.println("all coins ejected!");
  }else{
    Serial.print("Unknown command:");
    Serial.println(command);
  }
}

void ejectCoin(int pin){
  servo_pwm(pin, 500);
  servo_pwm(pin, 2000);
  delay(100);
}

void servo_pwm(int pin, int dur){
  int LoopCount = 35;

  for(i = 0; i < LoopCount; ++i){
    digitalWrite(pin, HIGH);
    delayMicroseconds(dur);
    digitalWrite(pin, LOW);
    delayMicroseconds(20000 - dur);
  }
}