upm/examples/python/l298-stepper.py

#!/usr/bin/python
# Author: Zion Orent <zorent@ics.com>
# Copyright (c) 2015 Intel Corporation.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
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# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
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# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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import time, sys, signal, atexit
import pyupm_l298 as upmL298

# Instantiate a Stepper motor on a L298 Dual H-Bridge.
# This was tested with the NEMA-17 12V, 350mA, with 200 steps per rev.
myHBridge = upmL298.L298(200, 3, 4, 7, 8, 9)


## Exit handlers ##
# This stops python from printing a stacktrace when you hit control-C
def SIGINTHandler(signum, frame):
	raise SystemExit

# This lets you run code on exit,
# including functions from myHBridge
def exitHandler():
	print "Exiting"
	sys.exit(0)

# Register exit handlers
atexit.register(exitHandler)
signal.signal(signal.SIGINT, SIGINTHandler)


myHBridge.setSpeed(10) # 10 RPMs
myHBridge.setDirection(upmL298.L298.DIR_CW)
myHBridge.enable(True)

print "Rotating 1 full revolution at 10 RPM speed."
# move 200 steps, a full rev
myHBridge.stepperSteps(200)

print "Sleeping for 2 seconds..."
time.sleep(2)

print "Rotating 1/2 revolution in opposite direction at 10 RPM speed."
myHBridge.setDirection(upmL298.L298.DIR_CCW)
myHBridge.stepperSteps(100)

# release
myHBridge.enable(False)

# exitHandler is called automatically