esp32_fade.ino

const byte led_gpio = 32; // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by


void setup() {
    
    ledcAttachPin(led_gpio, 0); // assign a led pins to a channel
    // Initialize channels
    // channels 0-15, resolution 1-16 bits, freq limits depend on resolution
    // ledcSetup(uint8_t channel, uint32_t freq, uint8_t resolution_bits);
    ledcSetup(0, 4000, 8); // 12 kHz PWM, 8-bit resolution
}

// the loop routine runs over and over again forever:
void loop() {

    ledcWrite(0, brightness); // set the brightness of the LED
    // change the brightness for next time through the loop:
    brightness = brightness + fadeAmount;
    // reverse the direction of the fading at the ends of the fade:
    if (brightness <= 0 || brightness >= 255) {
        fadeAmount = -fadeAmount;
    }
    // wait for 30 milliseconds to see the dimming effect
    delay(30);
}