A demonstration project showcasing PWM signal generation with adjustable duty cycle using ESP32's RMT (Remote Control) peripheral through ESP-IDF framework.
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This project implements a PWM generation solution using ESP32's RMT (Remote Control) peripheral, specifically designed to supplement the built-in LEDC PWM modules when all hardware PWM channels are occupied. By creatively repurposing the typically IR-focused RMT peripheral, developers can obtain additional PWM outputs while maintaining flexible duty cycle control.
- ✅ Provides extra PWM channels when LEDC resources are exhausted
- ✅ Dynamic duty cycle adjustment at runtime
- ✅ Configurable PWM frequency (10kHz default)
- ✅ Parallel operation with existing LEDC PWM modules
- ✅ Resolution up to 100 steps
- ESP32 series development board (Tested with ESP32-C3-DevKitM-1 V1.0)
- Oscilloscope for signal verification
Default Configuration:
- Signal GPIO:
GPIO19 - RMT Channel:
RMT_CHANNEL_0
- ESP-IDF v5.x+ installed
- ESP32 toolchain setup
- Serial terminal application (e.g.,
screen,minicom)
git clone https://github.com/oldrev/esp32c3-rmt-pwm-demo.git
cd esp32c3-rmt-pwm-demo.gitbash
idf.py build
bash
idf.py flash monitor
Observe PWM wave pattern (cycle time: 10 seconds)
Distributed under the Apache 2.0 License. See LICENSE for more information.
Contributions are welcome! Please open an issue or submit a PR for any improvements.