esp-idf/examples/peripherals/ledc/ledc_fade

LEDC Fade 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 selected SoC's on-board hardware LED PWM Controller module.

How to use example

Hardware Required

• A development board with any Espressif 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:

	Channel 0	Channel 1	Channel 2	Channel 3
ESP32	GPIO18	GPIO19	GPIO4	GPIO5
All other chips	GPIO8	GPIO9	GPIO4	GPIO5

Configure the project

idf.py menuconfig

Build and Flash

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

Run idf.py -p PORT flash monitor to build, flash and monitor the project.

(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.