kopia lustrzana https://github.com/espressif/esp-idf
57 wiersze
2.5 KiB
Markdown
57 wiersze
2.5 KiB
Markdown
![]() |
| Supported Targets | ESP32 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
|
||
|
| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- |
|
||
|
# RMT Transmit Example -- LED Strip
|
||
|
|
||
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
||
|
|
||
|
Almost any waveform can be generated by RMT peripheral, as long as a proper encoder is implemented. In this example, the simple callback RMT encoder is used to convert RGB pixels into format that can be recognized by hardware.
|
||
|
|
||
|
This example shows how to drive an addressable LED strip [WS2812](https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf) by implementing a callback that can be used by the simple callback RMT encoder.
|
||
|
|
||
|
## How to Use Example
|
||
|
|
||
|
### Hardware Required
|
||
|
|
||
|
* A development board with any supported Espressif SOC chip (see `Supported Targets` table above)
|
||
|
* A USB cable for Power supply and programming
|
||
|
* A WS2812 LED strip
|
||
|
|
||
|
Connection :
|
||
|
|
||
|
```
|
||
|
--- 5V
|
||
|
|
|
||
|
+
|
||
|
RMT_LED_STRIP_GPIO_NUM +------ +---|>| (WS2812 LED strip)
|
||
|
DI +
|
||
|
|
|
||
|
--- GND
|
||
|
```
|
||
|
|
||
|
The GPIO number used in this example can be changed according to your board, by the macro `RMT_LED_STRIP_GPIO_NUM` defined in the [source file](main/led_strip_example_main.c). The number of LEDs can be changed as well by `EXAMPLE_LED_NUMBERS`.
|
||
|
|
||
|
### Build and Flash
|
||
|
|
||
|
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.
|
||
|
|
||
|
## Console Output
|
||
|
|
||
|
```
|
||
|
I (302) cpu_start: Starting scheduler on PRO CPU.
|
||
|
I (0) cpu_start: Starting scheduler on APP CPU.
|
||
|
I (323) example: Create RMT TX channel
|
||
|
I (343) example: Create simple callback-based encoder
|
||
|
I (353) example: Start LED rainbow chase
|
||
|
```
|
||
|
|
||
|
|
||
|
After you seeing this log, you should see a rainbow chasing demonstration pattern. To change the chasing speed, you can update the `EXAMPLE_ANGLE_INC_FRAME` value in [source file](main/led_strip_example_main.c). To change the density of colors, you can change `EXAMPLE_ANGLE_INC_LED` in the same file.
|
||
|
|
||
|
## 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.
|