172ce2881e
CI script for checking links failed to parse link to due to parentheses. Bypass issue by encoding the symbol instead.
2.4 KiB
| Supported Targets | ESP32 | ESP32-S3 |
|---|
MCPWM RC Servo Control Example
(See the README.md file in the upper level 'examples' directory for more information about examples.)
This example illustrates how to drive a typical RC Servo by sending a PWM signal using the MCPWM driver. The PWM pulse has a frequency of 50Hz (period of 20ms), and the active-high time (which controls the rotation) ranges from 1ms to 2ms with 1.5ms always being center of range.
How to Use Example
Hardware Required
- A development board with any Espressif SoC which features MCPWM peripheral (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
- A USB cable for Power supply and programming
- A RC servo motor, e.g. SG90
Connection :
+-------+ +-----------------+
| | | |
| +-+ GPIO18++ PWM(Orange) +----------+ |
| ESP |---5V------+ Vcc(Red) +--------------| Servo Motor |
| +---------+ GND(Brown) +----------+ |
| | | |
+-------+ +-----------------+
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.
Example Output
Run the example, you will see the following output log:
...
I (0) cpu_start: Starting scheduler on APP CPU.
I (349) example: Angle of rotation: -90
I (449) example: Angle of rotation: -89
I (549) example: Angle of rotation: -88
I (649) example: Angle of rotation: -87
I (749) example: Angle of rotation: -86
...
The servo will rotate from -90 degree to 90 degree, and then turn back again.
Troubleshooting
Note that, some kind of servo might need a higher current supply than the development board usually can provide. It's recommended to power the servo separately.
For any technical queries, please open an [issue] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.