esp-idf/examples/peripherals/ledc/README.md

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# _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
```
make menuconfig
```
* Set serial port under Serial Flasher Options.
### Build and Flash
Build the project and flash it to the board, then run monitor tool to view serial output:
```
make -j4 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 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] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.