$ cd ~/Dexter/GoPiGo/Software/Python/Examples/Basic_Servo
$ ls -la
-rw-r--r-- 1 pi pi 2511 Apr 7 14:35 basic_servo.py
-rw-r--r-- 1 pi pi 1479 Apr 7 14:35 README.md
$ cat basic_servo.py
<![CDATA[#!/usr/bin/env python
########################################################################
# This example demonstrates controlling the Servo on the GoPiGo robot.
# In this example, we control the servo with a keyboard. When you run
# this example from the command line, you'll be prompted for input
# Press a key (a, d, or s) to move the servo. The data is collected,
# and sent to the GoPiGo.
#
# http://www.dexterindustries.com/GoPiGo/
# History
# ------------------------------------------------
# Author Date Comments
# Karan 21 Aug 14 Initial Authoring
#
'''
## License
GoPiGo for the Raspberry Pi: an open source robotics platform for the Raspberry Pi.
Copyright (C) 2017 Dexter Industries
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/gpl-3.0.txt>.
'''
#
########################################################################
from gopigo import *
servo_pos=90
print "CONTROLS"
print "a: move servo left"
print "d: move servo right"
print "s: move servo home"
print "Press ENTER to send the commands"
while True:
#Get the input from the user and change the servo angles
inp=raw_input() # Get keyboard input.
# Now decide what to do with that keyboard input.
if inp=='a':
servo_pos=servo_pos+10 # If input is 'a' move the servo forward 10 degrees.
elif inp=='d':
servo_pos=servo_pos-10 # If the input is 'd' move the servo backward by 10 degrees.
elif inp=='s':
servo_pos=90
#Get the servo angles back to the normal 0 to 180 degree range
if servo_pos>180:
servo_pos=180
if servo_pos<0:
servo_pos=0
servo(servo_pos) # This function updates the servo with the latest positon. Move the servo.
time.sleep(.1) # Take a break in between operations. ]]>
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