ESP32 PWM ADC

ESP32-PWM-ADC.ino

const int redLEDPin = 16;  /* GPIO16 */
const int greenLEDPin = 17;  /* GPIO17 */
const int blueLEDPin = 4;  /* GPIO4 */
uint16_t redDutyCycle;
uint16_t greenDutyCycle;
uint16_t blueDutyCycle;

const int redPWMFreq = 5000; /* 5 KHz */
const int redPWMChannel = 0;
const int redPWMResolution = 12;
const int RED_MAX_DUTY_CYCLE = (int)(pow(2, redPWMResolution) - 1);

const int greenPWMFreq = 8000; /* 8 KHz */
const int greenPWMChannel = 2;
const int greenPWMResolution = 13;
const int GREEN_MAX_DUTY_CYCLE = (int)(pow(2, greenPWMResolution) - 1);

const int bluePWMFreq = 10000; /* 10 KHz */
const int bluePWMChannel = 4;
const int bluePWMResolution = 14;
const int BLUE_MAX_DUTY_CYCLE = (int)(pow(2, bluePWMResolution) - 1);

const int ADC_RESOLUTION = 4095; /* 12-bit */


void setup()
{  
  /* Initialize Serial Port */
  Serial.begin(115200);
  /* Initialize PWM Channels with Frequency and Resolution */
  ledcSetup(redPWMChannel, redPWMFreq, redPWMResolution);
  ledcSetup(greenPWMChannel, greenPWMFreq, greenPWMResolution);
  ledcSetup(bluePWMChannel, bluePWMFreq, bluePWMResolution);
  /* Attach the LED PWM Channel to the GPIO Pin */
  ledcAttachPin(redLEDPin, redPWMChannel);
  ledcAttachPin(greenLEDPin, greenPWMChannel);
  ledcAttachPin(blueLEDPin, bluePWMChannel);
  
}
void loop()
{
  /* Read Analog Input from three ADC Inputs */
  redDutyCycle = analogRead(A0);
  greenDutyCycle = analogRead(A3);
  blueDutyCycle = analogRead(A4); 
  /* Map ADC Output to maximum possible dutycycle */
  //redDutyCycle = map(redDutyCycle, 0, ADC_RESOLUTION, 0, RED_MAX_DUTY_CYCLE);
  greenDutyCycle = map(greenDutyCycle, 0, ADC_RESOLUTION, 0, GREEN_MAX_DUTY_CYCLE);
  blueDutyCycle = map(blueDutyCycle, 0, ADC_RESOLUTION, 0, BLUE_MAX_DUTY_CYCLE);
  /* Set PWM Output of Channel with desired dutycycle */ 
  ledcWrite(redPWMChannel, redDutyCycle);
  ledcWrite(greenPWMChannel, greenDutyCycle);
  ledcWrite(bluePWMChannel, blueDutyCycle);

  Serial.println("RED -- GREEN -- BLUE");
  Serial.print(redDutyCycle);
  Serial.print(" -- ");
  Serial.print(greenDutyCycle);
  Serial.print(" -- ");
  Serial.print(blueDutyCycle);
  Serial.print("\n");

  delay(1000);
}