Program to control micro servo motor

Let's repeat another exercise from Chapter 6, PWM – Writing Analog Information to move a micro servo motor shaft to and fro. Connect the LED to P9_14 as shown in the diagram in Chapter 6. Type the following program in Cloud9, save it as microservo.py and run. You should be able to see the motor shaft moving in 180 degrees to and fro:

#!/usr/bin/python
import Adafruit_BBIO.PWM as PWM
from time import sleep

servo = "P9_14"
duty_min = 3

PWM.start(servo, 0, 60)

for loop in range(0, 10):
    for i in range(0, 180):
        ##move shaft from 0 to 180 degree
        PWM.set_duty_cycle(servo, (i*0.064) + duty_min)
        sleep(0.01)
    for i in range(0, 180):
        ##move shaft from 180 to 0 degree
        PWM.set_duty_cycle(servo, (180 - i)*0.064 + duty_min)
        sleep(0.01)

PWM.stop(servo)
PWM.cleanup()

Explanation

This program is similar to previous LED fade-in and -out program. As explained in Chapter 6, PWM – Writing Analog Information, the micro...