Class for Servo Control in Python on the Microbit
This is a simple class for controlling servos on the microbit in Python.
Using the Modules
There are two ways:
Quick and Easy
Cut and paste the class in servo.py to the top of the program.
See here for an example.
The correct approach is to copy the module to the filesystem. It can then be accessed in the same way the
microbit module is imported at the start of each program.
The are two steps: copying the module to the microbit and importing the module into your program.
Copying the module:
Save the module to your computer.
Copy the downloaded module to the
/mu_code/directory in the root of your home directory.
Flash your program to mu.
An error message will scroll across the screen about the lack of the servo module.
Once it has finished, click the 'files' icon in mu and upload the
servo.pyfile to your microbit.
Press reset on your microbit. When the program runs again it will load the module.
In your program:
from microbit import * # from servo.py import the Servo class from servo import Servo # this can now be accessed within your program sv1 = Servo(pin0) sv1.write_angle(50) # turn servo to 50 degrees
180 degree SG90 Hobby Servo @ 3.3v on pin0:
sv1 = Servo(pin0) sv1.write_angle(50) # turn servo to 50 degrees
180 degree SG90 Hobby Servo @ 4.8v on pin0:
note how min_us and max_us changes. These details will be on the servo's datasheet.
sv1 = Servo(pin0, min_us=1000, max_us=2000) sv1.write_angle(180) # turn servo to 180 degrees
180 degree Parallax 900-00005 (BS1) Servo @ 6v on pin1:
sv1 = Servo(pin1, min_us=750, max_us=2250) sv.write_angle(10)