#define ButtonRight 2
#define ButtonLeft 0
#define potentiometer 4
#define DC_Motor 16
#define LED 5

int currentPWM;
int deviceState = 1;
int LED_pwm;
int DC_Motor_pwm;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(ButtonRight, INPUT_PULLUP);
  pinMode(ButtonLeft, INPUT_PULLUP);
  pinMode(potentiometer, INPUT);
  pinMode(DC_Motor, OUTPUT);
  pinMode(LED, OUTPUT);
}

void loop() {
  //Read Potentiometer
  currentPWM = analogRead(potentiometer);
  currentPWM = map(currentPWM, 0,1023,0,255);

  //Which device is controlled? last pressed
  //if button 1, control DC Motor
  if(digitalRead(ButtonRight) == LOW){
    deviceState = 2;
  }
  //if button 2, Control LED
  if(digitalRead(ButtonLeft) == LOW){
    deviceState = 1;
  }
  //save current pwm for specific device
  if(deviceState == 1){
    LED_pwm = currentPWM;
  }
  if(deviceState == 2){
    DC_Motor_pwm = currentPWM;
  }

  analogWrite(LED, LED_pwm);
  analogWrite(DC_Motor, DC_Motor_pwm);
  delay(1000);
  
  //a debugging feature.
  Serial.println("device   :   pwm   ");
  String toPrint;
  toPrint += deviceState;
  toPrint += "    :    ";
  toPrint += DC_Motor_pwm;
  Serial.println(toPrint);


  delay(10); // this speeds up the simulation
}