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Supported Targets	ESP32-C3	ESP32-C5	ESP32-C6	ESP32-H2	ESP32-P4	ESP32-S2	ESP32-S3

RMT Transmit Loop Count Example -- Musical Buzzer

(See the README.md file in the upper level 'examples' directory for more information about examples.)

RMT tx channel can send symbols in a loop by hardware, which is useful to generate a variable length of periodic signal.

This example shows how to drive a passive buzzer to play a simple music. Each musical score is represented by a constant frequency of PWM with a constant duration. To play a music is to encoding the musical score continuously. An encoder called score_encoder is implemented in the example, it works as a simple wrapper of the copy_encoder. See musical_score_encoder for details.

How to Use Example

Hardware Required

A development board with any supported Espressif SOC chip (see Supported Targets table above)
A USB cable for Power supply and programming
A passive buzzer

Connection :

            VCC+--------------+
                              | /+
                             +++ |
                             | | | Passive Buzzer
                             +++ |
                              | \+
                              |
                        +     |
                        +<----+
RMT_BUZZER_GPIO+--------+
                        +-----+
                        +     |
                              |
            GND+--------------+

The GPIO number used in this example can be changed according to your board, by the macro RMT_BUZZER_GPIO_NUM defined in the source file.

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 full steps to configure and use ESP-IDF to build projects.

Console Output

...
I (0) cpu_start: Starting scheduler on APP CPU.
I (318) example: Create RMT TX channel
I (338) example: Install musical score encoder
I (348) example: Playing Beethoven's Ode to joy...
...

After you seeing this log, you should hear the music from the buzzer. To play other music, you need to change the musical score array score defined in the source file. The first member declares the frequency of one musical note, and the second member declares the duration that the note should last.

Troubleshooting

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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