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+---- Thread: [Python] Control steppermotor with RPI using python (/showthread.php?tid=5674242)
Control steppermotor with RPI using python - SIM-1517404 - Jul 20, 2017
Hi,
I'm working on controlling a bipolar stepper motor with the Raspberry pi using python scripts. I want to rotate the motor a specific set of degrees for a full 360 degree rotation. For example rotate the motor 11,25 degrees at a time a total of 32 times for a full rotation.
I have all the connections set up, but when I rund a script I found online the motor goes crazy, rotating uncontrollably in both directions.
Can someone point me in the right direction? The scripts I used is:
Code
import RPi.GPIO as GPIO
import time
# Variables
delay = 0.0055
steps = 500
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
# Enable pins for IN1-4 to control step sequence
coil_A_1_pin = 18
coil_A_2_pin = 23
coil_B_1_pin = 24
coil_B_2_pin = 25
# Set pin states
GPIO.setup(coil_A_1_pin, GPIO.OUT)
GPIO.setup(coil_A_2_pin, GPIO.OUT)
GPIO.setup(coil_B_1_pin, GPIO.OUT)
GPIO.setup(coil_B_2_pin, GPIO.OUT)
# Function for step sequence
def setStep(w1, w2, w3, w4):
GPIO.output(coil_A_1_pin, w1)
GPIO.output(coil_A_2_pin, w2)
GPIO.output(coil_B_1_pin, w3)
GPIO.output(coil_B_2_pin, w4)
# loop through step sequence based on number of steps
for i in range(0, steps):
setStep(1,0,1,0)
time.sleep(delay)
setStep(0,1,1,0)
time.sleep(delay)
setStep(0,1,0,1)
time.sleep(delay)
setStep(1,0,0,1)
time.sleep(delay)
# Reverse previous step sequence to reverse motor direction
for i in range(0, steps):
setStep(1,0,0,1)
time.sleep(delay)
setStep(0,1,0,1)
time.sleep(delay)
setStep(0,1,1,0)
time.sleep(delay)
setStep(1,0,1,0)
time.sleep(delay)* - koolkid - Jul 20, 2017
increase the delay to about 0.5 or 1 maybe 2 and post your results
* - SIM-1517404 - Jul 20, 2017
(Jul 20, 2017 01:06 PM)koolkid Wrote: increase the delay to about 0.5 or 1 maybe 2 and post your results
It goes 1 step forward, pauses for about a second, 1 step backwards, pauses for a second and repeat.
* - koolkid - Jul 20, 2017
change the delay to 0.05 and see if that works
* - SIM-1517404 - Jul 20, 2017
(Jul 20, 2017 01:36 PM)koolkid Wrote: change the delay to 0.05 and see if that works
Does the same thing, just faster. I think my output pins on the motor are messed up, I'm gonna double check and I'll get back.
* - koolkid - Jul 20, 2017
(Jul 20, 2017 01:42 PM)Swatchi Wrote: Does the same thing, just faster. I think my output pins on the motor are messed up, I'm gonna double check and I'll get back.
ok do that and test it again and see if it works
* - SIM-1517404 - Jul 21, 2017
(Jul 20, 2017 02:13 PM)koolkid Wrote: ok do that and test it again and see if it works
Now it's not rotating at all. I have no clue what is wrong, trying to figure it out.
* - koolkid - Jul 21, 2017
(Jul 21, 2017 05:34 AM)Swatchi Wrote: Now it's not rotating at all. I have no clue what is wrong, trying to figure it out.
did you switch the pins around ??
* - SIM-1517404 - Jul 21, 2017
(Jul 21, 2017 05:45 AM)koolkid Wrote: did you switch the pins around ??
Yeah I did. The motor is getting voltage because it tightens up, but I don't know if maybe the driver is fried. I don't know what else to check/do at this point.
* - koolkid - Jul 21, 2017
(Jul 21, 2017 05:55 AM)Swatchi Wrote: Yeah I did. The motor is getting voltage because it tightens up, but I don't know if maybe the driver is fried. I don't know what else to check/do at this point.
try putting back the pins to their original state