mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
67 lines
2.1 KiB
Markdown
67 lines
2.1 KiB
Markdown
# _RMT Transmit Example_
|
|
|
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
|
|
|
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.
|
|
|
|
## How to Use Example
|
|
|
|
### Hardware Required
|
|
|
|
* A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WORVER-KIT, etc.)
|
|
* A USB cable for Power supply and programming
|
|
* A LED, a speaker or an earphone
|
|
|
|
Connection :
|
|
|
|
```
|
|
330R LED
|
|
GPIO18 +----/\/\/\----+------|>|-----+ GND
|
|
|
|
|
| /|
|
|
+-+ | Speaker
|
|
| | | or
|
|
+-+ | earphone
|
|
| \|
|
|
|
|
|
+--------------+ GND
|
|
```
|
|
|
|
### Configure the Project
|
|
|
|
```
|
|
make menuconfig
|
|
```
|
|
|
|
* Set serial port under Serial Flasher Options.
|
|
|
|
### Build and Flash
|
|
|
|
Build the project and flash it to the board, then run monitor tool to view serial output:
|
|
|
|
```
|
|
make -j4 flash monitor
|
|
```
|
|
|
|
(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.
|
|
|
|
## Example Output
|
|
|
|
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`).
|
|
|
|
Run this example, you will see the following output log:
|
|
```
|
|
RMT Tx: Transmission complete
|
|
RMT Tx: Sample transmission complete
|
|
```
|
|
|
|
## Troubleshooting
|
|
|
|
* Programming fail
|
|
|
|
* Hardware connection is not correct: run `make monitor`, and reboot your board to see if there is any output logs.
|
|
* The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
|
|
|
|
For any technical queries, please open an [issue] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon. |