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66 lines
2.7 KiB
Markdown
66 lines
2.7 KiB
Markdown
| Supported Targets | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
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| ----------------- | -------- | -------- | -------- | -------- | -------- | -------- |
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# RMT Transmit Loop Count Example -- Musical Buzzer
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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RMT tx channel can send symbols in a loop by hardware, which is useful to generate a variable length of periodic signal.
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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](main/musical_score_encoder.c) for details.
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## How to Use Example
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### Hardware Required
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* A development board with any supported Espressif SOC chip (see `Supported Targets` table above)
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* A USB cable for Power supply and programming
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* A **passive** buzzer
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Connection :
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```
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VCC+--------------+
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| /+
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+++ |
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| | | Passive Buzzer
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+++ |
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| \+
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+ |
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+<----+
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RMT_BUZZER_GPIO+--------+
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+-----+
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+ |
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GND+--------------+
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```
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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](main/musical_buzzer_example_main.c).
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### Build and Flash
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Run `idf.py -p PORT flash monitor` to build, flash and monitor the project.
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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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## Console Output
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```
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...
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I (0) cpu_start: Starting scheduler on APP CPU.
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I (318) example: Create RMT TX channel
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I (338) example: Install musical score encoder
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I (348) example: Playing Beethoven's Ode to joy...
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...
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```
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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](main/musical_buzzer_example_main.c). The first member declares the frequency of one musical note, and the second member declares the duration that the note should last.
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## Troubleshooting
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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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