esp-idf/examples/peripherals/ledc

LEDC (LED PWM Controller) Example

This example shows how to control intensity of LEDs using ESP32's on-board hardware LED PWM Controller module.

Functionality

Operations performed by example:

• Configuration of two timers (one high speed and the other low speed) that will be clocking four LEDC channels.

• Configuration of four channels of LEDC module, two channels will operate in high speed mode and two in low speed mode. Each channel will drive one GPIO / LED.

• Initialization of fade service to fade / gradually change intensity of LEDs.

• Operation of channels in a loop by cycling through four steps that will drive LEDs as follows:

  1. Fade up / increase intensity
  2. Fade down / decrease intensity (down to zero)
  3. Set steady intensity
  4. Set intensity to zero

Hardware Setup

Connect four LEDs to the following LEDC channels / individual GPIOs:

• Channel 0 - GPIO18
• Channel 1 - GPIO19
• Channel 2 - GPIO4
• Channel 3 - GPIO5