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README.md
RMT Transmit Example -- Morse Code
(See the README.md file in the upper level 'examples' directory for more information about examples.)
This example mainly illustrates how to transmit the Morse code using the RMT driver.
How to Use Example
Hardware Required
- A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WROVER-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
Open the project configuration menu (idf.py menuconfig
).
In the Example Configuration
menu:
- Set the GPIO number used for transmitting the IR signal under
RMT TX GPIO
optin.
Build and Flash
Run idf.py -p PORT flash monitor
to build, flash and monitor the project.
(To exit the serial monitor, type Ctrl-]
.)
See the Getting Started Guide for all the steps to configure and use the ESP-IDF to build projects.
- ESP-IDF Getting Started Guide on ESP32
- ESP-IDF Getting Started Guide on ESP32-S2
- ESP-IDF Getting Started Guide on ESP32-C3
Example Output
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.
Run the example, you will see the following output log:
...
I (304) example: Configuring transmitter
I (2814) example: Transmission complete
...
Troubleshooting
For any technical queries, please open an issue on GitHub. We will get back to you soon.