Stepper Motors - How does it work and let's control with Python...
#Full Step:
# Import required libraries
import sys
import time
import RPi.GPIO as GPIO
# Use BCM GPIO references
# instead of physical pin numbers
GPIO.setmode(GPIO.BCM)
#GPIO.setmode(GPIO.BOARD)
# Define GPIO signals to use
# Physical pins 11,15,16,18
# GPIO17,GPIO22,GPIO23,GPIO24
StepPins = [17,22,23,24]
# Set all pins as output
for pin in StepPins:
GPIO.setup(pin,GPIO.OUT)
GPIO.output(pin, False)
# Define advanced sequence
# as shown in manufacturers datasheet
Seq = [[1,0,0,0],
[0,1,0,0],
[0,0,1,0],
[0,0,0,1]
]
StepCount = len(Seq)
StepDir = 1 # Set to 1 or 2 for clockwise
# Set to -1 or -2 for anti-clockwise
# Read wait time from command line
if len(sys.argv)>1:
WaitTime = int(sys.argv[1])/float(1000)
else:
WaitTime = 10/float(1000)
# Initialise variables
StepCounter = 0
# Start main loop
while True:
print (StepCounter)
print (Seq[StepCounter])
for pin in range(0, 4):
xpin = StepPins[pin]
if Seq[StepCounter][pin]!=0:
print("Enable GPIO %i" %(xpin))
GPIO.output(xpin, True)
else:
GPIO.output(xpin, False)
StepCounter += StepDir
# If we reach the end of the sequence
# start again
if (StepCounter>=StepCount):
StepCounter = 0
if (StepCounter<0):
StepCounter = StepCount+StepDir
# Wait before moving on
time.sleep(WaitTime)
=====
#Half Step:
# Import required libraries
import sys
import time
import RPi.GPIO as GPIO
# Use BCM GPIO references
# instead of physical pin numbers
GPIO.setmode(GPIO.BCM)
#GPIO.setmode(GPIO.BOARD)
# Define GPIO signals to use
# Physical pins 11,15,16,18
# GPIO17,GPIO22,GPIO23,GPIO24
StepPins = [17,22,23,24]
# Set all pins as output
for pin in StepPins:
GPIO.setup(pin,GPIO.OUT)
GPIO.output(pin, False)
# Define advanced sequence
# as shown in manufacturers datasheet
#Seq = [[1,0,0,1],
[1,0,0,0],
[1,1,0,0],
[0,1,0,0],
[0,1,1,0],
[0,0,1,0],
[0,0,1,1],
[0,0,0,1]]
StepCount = len(Seq)
StepDir = 1 # Set to 1 or 2 for clockwise
# Set to -1 or -2 for anti-clockwise
# Read wait time from command line
if len(sys.argv)>1:
WaitTime = int(sys.argv[1])/float(1000)
else:
WaitTime = 10/float(1000)
# Initialise variables
StepCounter = 0
# Start main loop
while True:
print (StepCounter)
print (Seq[StepCounter])
for pin in range(0, 4):
xpin = StepPins[pin]
if Seq[StepCounter][pin]!=0:
print("Enable GPIO %i" %(xpin))
GPIO.output(xpin, True)
else:
GPIO.output(xpin, False)
StepCounter += StepDir
# If we reach the end of the sequence
# start again
if (StepCounter>=StepCount):
StepCounter = 0
if (StepCounter<0):
StepCounter = StepCount+StepDir
# Wait before moving on
time.sleep(WaitTime)
