mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
55 lines
2.1 KiB
Markdown
55 lines
2.1 KiB
Markdown
| Supported Targets | ESP32 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-S2 | ESP32-S3 |
|
|
| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- |
|
|
|
|
# Sigma Delta Modulation LED Example
|
|
|
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
|
|
|
This example uses the sigma-delta driver to generate modulated output on a GPIO. If you connect a LED or LCD backlight control to the output GPIO, you will see it slowly brightening and dimming.
|
|
|
|
## How to use example
|
|
|
|
### Hardware Required
|
|
|
|
* A development board with any supported Espressif SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
|
|
* A USB cable for Power supply and programming
|
|
* An LED and a resistor to limit the LED current. Connect them as below:
|
|
|
|
```
|
|
330R LED
|
|
EXAMPLE_SIGMA_DELTA_GPIO_NUM +----/\/\/\----+------|>|-----+ GND
|
|
```
|
|
|
|
### Configure the project
|
|
|
|
You can change the GPIO number by [EXAMPLE_SIGMA_DELTA_GPIO_NUM](main/sdm_led_example_main.c).
|
|
|
|
### 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](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to configure and use ESP-IDF to build projects.
|
|
|
|
## Example Output
|
|
|
|
Once the upload is complete and the board is reset, the program should start running. This is reported on the monitor as below:
|
|
|
|
```
|
|
...
|
|
I (245) cpu_start: Starting scheduler.
|
|
I (249) example: Install sigma delta channel
|
|
I (249) gpio: GPIO[0]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
|
|
I (259) example: Enable sigma delta channel
|
|
I (259) example: Change duty cycle continuously
|
|
```
|
|
|
|
Immediately after that the LED should start brightening and dimming.
|
|
|
|
## Troubleshooting
|
|
|
|
For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
|