const float Vled = 2.0; // ________________________________________________
const float Vmax = 3.3; // ________________________________________________
const int PWMmax = 255; // ________________________________________________

int pwmLimit;

void setup() {             // ________________________________________
 Serial.begin(115200);       // ________________________________________
 analogReadResolution(10); // ________________________________________
 pwmLimit = (Vled / Vmax) * PWMmax;
}


void loop() {

  int raw = analogRead(26); // ________________________________________

  int pwmValue = map(raw, 0, 1023, pwmLimit, 255); // ____________________________

  analogWrite(22, pwmValue); // ________________________________________

  Serial.print("ADC: ");
  Serial.print(raw);
  Serial.print(",  PWM: ");
  Serial.print(pwmValue);
  Serial.print(" (");
  Serial.print(pwmLimit);
  Serial.print("),  Vout: ");
  Serial.print((float)pwmValue / 255.0 * 3.3); // ___________________________
  Serial.print(" (Vled :");
  Serial.print(Vled);
  Serial.println(")");

  delay(200);   // ________________________________________

}