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64 lines
2.2 KiB
Markdown
64 lines
2.2 KiB
Markdown
# _RMT Transmit Example_
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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 will shows how to configure and operate the remote control (RMT) peripheral to transmit a sample message in the [Morse code](https://en.wikipedia.org/wiki/Morse_code), it also shows how to transmit custom format of data.
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## How to Use Example
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### Hardware Required
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To run this example, you need to prepare a development board with esp32 SoC(e.g., ESP32_Core_board, ESP-WORVER_KIT etc), a LED, a speaker or an earphone and a USB cable for power supply and programming.
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### Configure the Project
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```
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make menuconfig
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```
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* Set serial port under Serial Flasher Options.
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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make -j4 flash monitor
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```
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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 a LED and a speaker or an earphone (be careful - it may be loud) to the GPIO18(the pin can be changed by modify the definition of `RMT_TX_GPIO` in `main/rmt_tx_main.c`).
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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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Run this example, you will see the following output log:
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```
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RMT Tx: Transmission complete
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RMT Tx: Sample transmission complete
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```
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## Troubleshooting
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* Programming fail
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* To check whether the hardware connection is correct, you can run `make monitor` and reboot your board to see if there are any output logs.
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* Your download baud-rate is too high. please lower your download baud-rate in menuconfig and try again.
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If any problems that can't be resolved, please open an issue in GitHub(https://github.com/espressif/esp-idf/issues), we will reply to you soon. |