Positioning a shaft to indicate a value with a servo motor
We can use the
mraa.Pwm class to control PWM on the PWM capable GPIO pin labeled ~3, as we learned in Chapter 4, Working with a RESTful API and Pulse Width Modulation. However, this would require us to read the detailed specs for the servo. The
upm library includes support for both the SeeedStudio Grove Servo or the EMAX 9g ES08A High Sensitive Mini Servo in the
pyupm_servo module. The
ES08A class declared in this module represents any of the two mentioned servors connected to our board.
The class makes it easy to set the desired angle for the servo shaft and work with angles instead of duty cycles and other PWM details. The class works with the
mraa.Pwm class under the hoods to configure ...