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57 lines
2.5 KiB
Markdown
57 lines
2.5 KiB
Markdown
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| Supported Targets | ESP32 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
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| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- |
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# RMT Transmit Example -- LED Strip
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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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.
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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.
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## How to Use Example
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### Hardware Required
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* A development board with any supported Espressif SOC chip (see `Supported Targets` table above)
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* A USB cable for Power supply and programming
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* A WS2812 LED strip
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Connection :
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```
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--- 5V
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+
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RMT_LED_STRIP_GPIO_NUM +------ +---|>| (WS2812 LED strip)
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DI +
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--- GND
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```
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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`.
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### Build and Flash
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Run `idf.py -p PORT flash monitor` to build, flash and monitor the project.
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(To exit the serial monitor, type ``Ctrl-]``.)
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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.
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## Console Output
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```
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I (302) cpu_start: Starting scheduler on PRO CPU.
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I (0) cpu_start: Starting scheduler on APP CPU.
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I (323) example: Create RMT TX channel
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I (343) example: Create simple callback-based encoder
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I (353) example: Start LED rainbow chase
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```
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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.
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## Troubleshooting
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For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
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