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esp-idf/examples/peripherals/ledc/ledc_fade/README.md
pedro.minatel a6798eac98 Added LEDC basic PWM example 
Changes on the ledc_init function
Review on the README, docs and example functions
Added how to set freq and duty on README
Fix on the ledc.rst docs in the App Example
Added new example reference in the Chinese docs
2021-04-28 11:11:07 +01:00

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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 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.