(Aug 2, 2017 05:22 AM)Swatchi Wrote:  Well, the sequence steps the motor 4 times, and I loop through the sequence 50 times, adding up to a total of 200 steps. Using a 5V motor, bought it at a local store, it's from Luxorparts. And using a TB6612fng driver.

(Aug 2, 2017 06:42 AM)Jomaki Wrote:  Given in the for loop which actually controls the stepping there are four separate setStep commands, and you are doing four times less loops than there are steps, I am willing to bet that each of these setSteps does a singular step.

The code to explain what I am thinking:

Code

import RPi.GPIO as GPIO
import time

# Variables

delay = 0.0055
steps = 200

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 set_step(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

# gives us a list so we can essentially iterate through each of the different step values
# meaning we can iterate through each "part" of the original stepping sequence
step_values = [{"w1":1, "w2":0, "w3":1, "w4":0},
                {"w1":0, "w2":1, "w3":1, "w4":0},
                {"w1":0, "w2":1, "w3":0, "w4":1},
                {"w1":1, "w2":0, "w3":0, "w4":1}]


current_step_count = 0
def step_motor():
    needed_step_values = step_values[current_step_count % 4]
    set_step(needed_step_values["w1"], needed_step_values["w2"], needed_step_values["w3"], needed_step_values["w4"])
    time.sleep(delay)
    current_step_count += 1

    # this should turn everything off to stop them moving -- not sure if this is necessary
    # trying commenting it out if it doesn't work with it in
    set_step(0, 0, 0, 0)

for i in range(0, steps):
    step_motor()

As I said in the comments, I am not certain if line 54 would be necessary. (note: I also changed setStep to set_step to be coherent with the rest of the code).

Try this out and let me know if it works.

EDIT: Just realised I added to the step count too early and fixed it.

(Aug 15, 2017 12:01 PM)Swatchi Wrote:  Sorry for the late response, I've been away for a couple of weeks.

The result I get from running the code is:

Code

Traceback (most recent call last):
  File "StepperTest.py", line 68, in <module>
    step_motor()
  File "StepperTest.py", line 58, in step_motor
    needed_step_values = step_values[current_step_count % 4]
UnboundLocalError: local variable 'current_step_count' referenced before assignment

(Aug 16, 2017 12:30 PM)datguy.dev Wrote:  

PHP Code


<?php 
current_step_count = 0
def step_motor():
    global current_step_count #ADD ME
    needed_step_values = step_values[current_step_count % 4]
    set_step(needed_step_values["w1"], needed_step_values["w2"], needed_step_values["w3"], needed_step_values["w4"])
    time.sleep(delay)
    current_step_count += 1 


See #add me. If you do this (current_step_count += 1) you need to add the global statement.