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63 lines
1.9 KiB
Markdown
63 lines
1.9 KiB
Markdown
# RMT Transmit Example -- Morse Code
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example mainly illustrates how to transmit the [Morse code](https://en.wikipedia.org/wiki/Morse_code) using the RMT driver.
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## How to Use Example
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### Hardware Required
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* A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
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* A USB cable for Power supply and programming
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* A LED, a speaker or an earphone
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Connection :
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```
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330R LED
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GPIO18 +----/\/\/\----+------|>|-----+ GND
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+-+ | Speaker
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+-+ | earphone
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+--------------+ GND
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```
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### Configure the Project
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Open the project configuration menu (`idf.py menuconfig`).
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In the `Example Connection Configuration` menu:
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* Set the GPIO number used for transmitting the IR signal under `RMT TX GPIO` optin.
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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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## Example Output
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To be able to see and hear the message output by the RMT, connect an LED and a speaker or an earphone (be careful it might make a large noise) to the GPIO you set in the menuconfig.
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Run the example, you will see the following output log:
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``` bash
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...
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I (304) example: Configuring transmitter
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I (2814) example: Transmission complete
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...
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```
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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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