// setting PWM properties
const int freq = 5000;
const int pwmChannel = 0;
const int resolution = 8;

const int transistorPin = 42;    // connected to the base of the transistor

void setup() {
  // set  the transistor pin as output:
  pinMode(transistorPin, OUTPUT);
  
  // configure LED PWM functionalities
  ledcSetup(pwmChannel, freq, resolution);

  // attach the channel to the GPIO to be controlled
  ledcAttachPin(transistorPin, pwmChannel);

  // hack to connect potentiometer directly into 3 pins
  pinMode(14, OUTPUT);
  pinMode(12, INPUT);
  pinMode(10, OUTPUT);
  digitalWrite(14, HIGH);
  digitalWrite(10, LOW); 

  Serial.begin(115200);
}

void loop() {
  // read the potentiometer:
  int sensorValue = analogRead(12);
  // map the sensor value to a range from 0 - 255:
  int outputValue = map(sensorValue, 0, 8191, 0, 255);
  Serial.println(outputValue); 
  // use that to control the transistor:
  ledcWrite(pwmChannel, outputValue);
}