[SIM-1517404]

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]

increase the delay to about 0.5 or 1 maybe 2 and post your results

[SIM-1517404]

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]

change the delay to 0.05 and see if that works

[SIM-1517404]

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]

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]

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]

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]

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]

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