/*
 * Original code taken from ESP32 provided driver code
 * This is Arduino code to control two or more LEDs and fade them
 * using PWM and the 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: December 17, 2017, in Ajax, Ontario, Canada
 
 * Disclaimer: this code is "AS IS" and for educational purposes only.
 * This code has been downloaded from https://robojax.com
 
 * Get this code and other Arduino codes from Robojax.com.
 Learn Arduino step by step in a structured course with all material, wiring diagrams, and libraries
 all in one place. Purchase my course on Udemy.com: http://robojax.com/L/?id=62

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or make a donation using PayPal: http://robojax.com/L/?id=64

 *  * 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 downloaded 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 the first channel of 16 channels (started from zero)
#define LEDC_CHANNEL_0     0
#define LEDC_CHANNEL_1     1
// Use 13-bit precision for the 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
}