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Knob.py
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Knob.py
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#!/usr/bin/env python
"""
Knob.py
This example shows how to use a servo motor attached
to a PWM pin through a potentiometer.
This example code is in the public domain.
Revision History
----------------------------------------------------------
Author Date Description
----------------------------------------------------------
Diego Villalobos 02-12-2015 Example created
"""
# Libraries required
from Servo import *
import mraa
import time
# Create a new servo object with a reference name
myServo = Servo("First Servo")
# Attaches the servo to pin 3 in Arduino Expansion board
myServo.attach(3)
# Attaches the potentiometer to analog input A0
# in Arduino Expansion Board
pot = mraa.Aio(0)
pot.setBit(12)
valuePot = 0
# Print servo settings
print ""
print "*** Servo Initial Settings ***"
print myServo
print ""
print "Move the knob."
print ""
try:
# Move the servo using the potentiometer
while True:
# Read the analog value from pot
valuePot = pot.read()
# mapValue() is in the Servo library
angle = mapValue(valuePot, 0, 4096, 0, 180)
# Write the angle
myServo.write(angle)
time.sleep(0.005)
except KeyboardInterrupt:
print "Knob ended."