analogWriteExample.ino

Go to the documentation of this file.

/*
 Mega analogWrite() test

 This sketch fades LEDs up and down one at a time on digital pins 2 through 13.
 This sketch was written for the Arduino Mega, and will not work on previous boards.

 The circuit:
 * LEDs attached from pins 2 through 13 to ground.

 created 8 Feb 2009
 by Tom Igoe

 This example code is in the public domain.

 */
// These constants won't change.  They're used to give names
// to the pins used:
const int lowestPin = 2;
const int highestPin = 33;
#include <ESP32Servo.h>
Servo myservo;

void setup() {
    Serial.begin(115200);
    // Allow allocation of all timers
    ESP32PWM::allocateTimer(0);
    ESP32PWM::allocateTimer(1);
    ESP32PWM::allocateTimer(2);
    ESP32PWM::allocateTimer(3);
}

void loop() {
    if (!myservo.attached()) {
        myservo.setPeriodHertz(50); // standard 50 hz servo
        myservo.attach(33, 1000, 2000); // Attach the servo after it has been detatched
    }
    myservo.write(0);
    // iterate over the pins:
    for (int thisPin = lowestPin; thisPin <= highestPin; thisPin++) {
        if (ESP32PWM::hasPwm(thisPin) &&  // Is it possible for this pin to PWM
                (ESP32PWM::channelsRemaining() > 0 || // New channels availible to allocate
                        pwmFactory(thisPin) != NULL || // already allocated this pin in the factory
                        thisPin == 25 || // one of the  2 DAC outputs, no timer needed
                        thisPin == 26)) { // one of the 2 DAC outputs, no timer needed
            if (pwmFactory(thisPin) == NULL) { // check if its the first time for the pin or its a DAC
                if (thisPin == 25 || // one of the 2 DAC outputs, no timer needed
                        thisPin == 26) {
                    Serial.println("DAC to pin " + String(thisPin));
                } else
                    Serial.println("Writing to pin " + String(thisPin));
                pinMode(thisPin, OUTPUT);
            }
            // fade the LED on thisPin from off to brightest:
            for (int brightness = 0; brightness < 255; brightness++) {
                analogWrite(thisPin, brightness);
                delay(1);
                myservo.write(brightness);
            }
            // fade the LED on thisPin from brithstest to off:
            for (int brightness = 255; brightness >= 0; brightness--) {
                analogWrite(thisPin, brightness);
                myservo.write(brightness);
                delay(1);
            }

        }
    }
    myservo.detach(); // Turn the servo off for a while
    delay(2000);

}