ESP32 Servo control

/*
 * ESP32 Servo control
 *
 * learnelectronics
 * 2 JAN 2018
 *
 * www.youtube.com/c/learnelectronics
 * [email protected]
 *
 *
 * Sketch adapted from original code by MJRobot
 *
 */


 #define ANALOG_PIN_0 32                          //we need to tell the ESP32 what pin we want for the analog read
 int analog_value = 0;                            //set our initial value as 0


 #define SERVO_PIN 5                              //we need to tell the ESP32 what pin the servo is on
 int freq = 50;                                   //servos operate @ 50Hz so we ned to set the freq to that value
 int channel = 0;                                 //which channel do we want to use
 int resolution = 8;                              //set out resolution for a resonable value
 int dutyCycle = 21;                              //this is about the halfway point (90deg)

 void setup()
 {
  Serial.begin(115200);                           //serial comms @ 115200
  delay(1000);                                    // wait one
  Serial.println("ESP32 Servo Control");          //intro
  ledcSetup(channel, freq, resolution);           //we need to setup the ledc function with channel, freq, and resultion
  ledcAttachPin(SERVO_PIN,channel);               //then we attach our servo
  ledcWrite(channel,dutyCycle);                   //reset the servo
 }

 void loop()
 {
  analog_value = analogRead(ANALOG_PIN_0);        //read the value from the pot
  Serial.print(analog_value);                     //print the value to serial
  Serial.print(" Duty Cycle -> ");                //print words
  Serial.println(dutyCycle);                      //print out the duty cycle
  dutyCycle = map(analog_value, 0, 4095, 10, 33); //calculate duty cycle
  ledcWrite(channel, dutyCycle);                  //write the current duty cycle to the servo
  delay(50);                                      //wait 50mS
 }