Other Arduino Codes and Videos by Robojax
This video shows how to fade or dim LED lights using ESP32.
/*
* Original code taken from ESP32 provided driver code
* This is Arduino code to control 2 or more LEDs and fade them
* using PWM and LEDC library of ESP32
*
* watch the video for explanation of this video:https://youtu.be/VCM6KMMvBfE
* Written/updated by Ahmad Shamshiri for Robojax Video channel www.Robojax.com
* Date: Dec 17, 2017, in Ajax, Ontario, Canada
* Disclaimer: this code is "AS IS" and for educational purpose only.
* this code has been downloaded from http://robojax.com/learn/arduino/
* Get this code and other Arduino codes from Robojax.com
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* * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.*
* This code has been download from Robojax.com
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
// use first channel of 16 channels (started from zero)
#define LEDC_CHANNEL_0 0
#define LEDC_CHANNEL_1 1
// use 13 bit precission for LEDC timer
#define LEDC_TIMER_13_BIT 13
// use 5000 Hz as a LEDC base frequency
#define LEDC_BASE_FREQ 5000
// fade LED PIN (replace with LED_BUILTIN constant for built-in LED)
#define LED_PIN0 17
#define LED_PIN1 16
int brightness0 = 0; // how bright the LED is
int brightness1 = 0; // how bright the LED is
int fadeAmount0 = 5; // how many points to fade the LED by
int fadeAmount1 = 10; // how many points to fade the LED by
// Arduino like analogWrite
// value has to be between 0 and valueMax
void ledcAnalogWrite(uint8_t channel, uint32_t value, uint32_t valueMax = 255) {
// calculate duty, 8191 from 2 ^ 13 - 1
uint32_t duty = (8191 / valueMax) * min(value, valueMax);
// write duty to LEDC
ledcWrite(channel, duty);
}
void setup() {
// Robojax.com ESP32 Fading LEDs 20191217
// Setup timer and attach timer to a led pin
ledcSetup(LEDC_CHANNEL_0, LEDC_BASE_FREQ, LEDC_TIMER_13_BIT);
ledcAttachPin(LED_PIN0, LEDC_CHANNEL_0);
ledcSetup(LEDC_CHANNEL_1, LEDC_BASE_FREQ, LEDC_TIMER_13_BIT);
ledcAttachPin(LED_PIN1, LEDC_CHANNEL_1);
}
void loop() {
// Robojax.com ESP32 Fading LEDs 20191217
// set the brightness on LEDC channel 0
ledcAnalogWrite(LEDC_CHANNEL_0, brightness0);
ledcAnalogWrite(LEDC_CHANNEL_1, brightness1);
// change the brightness for next time through the loop:
brightness0 = brightness0 + fadeAmount0;
brightness1 = brightness1 + fadeAmount1;
// brightness1 +=100;
// reverse the direction of the fading at the ends of the fade:
if (brightness0 <= 0 || brightness0 >= 255) {
fadeAmount0 = -fadeAmount0;
}
if (brightness1 <= 0 || brightness1 >= 255) {
fadeAmount1 = -fadeAmount1;
}
// wait for 30 milliseconds to see the dimming effect
delay(30);
// Robojax.com ESP32 Fading LEDs 20191217
}
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