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b23718995a
esp-idf/examples/peripherals/ledc
History
Angus Gratton b23718995a Merge branch 'bugfix/strict_prototypes' into 'master' 
Enable strict prototypes checks

Closes IDFGH-757

See merge request espressif/esp-idf!4546
2019-08-05 09:38:39 +08:00
..
main tools: Mass fixing of empty prototypes (for -Wstrict-prototypes) 2019-08-01 16:28:56 +07:00
CMakeLists.txt cmake: make main a component again 2018-09-11 09:44:12 +08:00
Makefile Moved examples to new folders / categories. Removed example numbers from example names 2017-01-16 23:08:35 +01:00
README.md examples: change default build instructions in docs to CMake 2019-08-02 16:32:46 +05:30

README.md

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
  • 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:

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] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.