esp-idf/examples/peripherals/rmt_tx/README.md

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# RMT Transmit Example
This example 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).
Configuration (pin number, etc.) can be modified in the top of the `main/rmt_tx_main.c` file.
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 GPIO configured under `RMT_TX_GPIO` define (default is GPIO 18).
Example connections:
```
330R LED
GPIO18 +----/\/\/\----+------|>|-----+ GND
|
| /|
+-+ | Speaker
| | | or
+-+ | earphone
| \|
|
+--------------+ GND
```
See the README.md file in the upper level 'examples' directory for more information about examples.