esp-idf/examples/peripherals/ledc

LEDC Example

(See the README.md file in the upper level 'examples' directory for more information about examples.)

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

How to use example

Hardware Required

• A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
• A USB cable for power supply and programming

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

ledc channel	GPIO
channel 0	GPIO18
channel 1	GPIO19
channel 2	GPIO4
channel 3	GPIO5

Configure the project

idf.py menuconfig

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output:

idf.py -p PORT flash monitor

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

Running this example, you will see each ledc's brightness changes differently

• LEDC 1: Fade up / increase intensity
• LEDC 2: Fade down / decrease intensity
• LEDC 3: Keep a stable intensity
• LEDC 4: LED is not on

you can also see the following output log on the serial monitor:

1. LEDC fade up to duty = 4000
2. LEDC fade down to duty = 0
3. LEDC set duty = 4000 without fade
4. LEDC set duty = 0 without fade
...

Troubleshooting

• Programming fail

  • Hardware connection is not correct: run idf.py -p PORT monitor, and reboot your board to see if there are any output logs.
  • The baud rate for downloading is too high: lower your baud rate in the menuconfig menu, and try again.

For any technical queries, please open an issue on GitHub. We will get back to you soon.