Accelstepper library not working to drive stepper motor

Projects General Guidance
1

I am having trouble with making a stepper motor move in any manner with the AccelStepper library. I have looked for people with similar problems but have not found the issue anywhere else. It is most likely because I am new to anything Arduino. I am using an Arduino Giga R1 wifi and a DRV8825 driver. I have gotten the library to work with one of my school's Arduino uno but when I transfer the code to my Giga it doesn't work. I have the latest version of AccelStepper installed. I have made custom code that sends pulses to the driver and that successfully drives the motor at a constant speed so I know the wiring isn't and issue. I get the same behavior with and without the shield. my power supply is 12v and 2 amps

here is my full test code

#include <AccelStepper.h>

#define STEP 3
#define DIR 2

AccelStepper stepper(AccelStepper::DRIVER, STEP, DIR);

void setup() {

  stepper.setMaxSpeed(50);  
  stepper.setAcceleration(20);

}

void loop() {

  stepper.run();

}

here is a picture of my wiring on a bread board. i have since created a soldered version with identical wiring and the capacitor on the board rather than on the cord and they both behave the exact same

IMG_2907.HEIC
IMG_2907.HEIC3024×4032 2.6 MB

I'd be thankful for any advice

2

It looks like you are powering the motors through the Arduino. Would you post a wiring diagram?

3

I am supplying 5v logic power to the driver from the Arduino. i have the Arduino's VIN pin tied into the 12v power that is powering the driver. I have ran the Arduino disconnected from the 12v power and powered by my laptop instead and get the same behavior.

4

Every "Arduino" is not comparable to the UNO, not compatible.

5

Do you know of any stepper control liberies other than AccelStepper that allow for accelration control.

6

Mobatools has been recommended by other helpers.

7

You have configured the stepper, but you still need to set a speed (e.g. stepper.setSpeed(50) with stepper.runSpeed()) or a target position (e.g. stepper.move(100) or steppermoveTo(200)) before it uses the configuration to do something.

Take a look at these examples:

8

On my DRV8825, both RESET and SLEEP pins are connected to MCU +V.
https://www.pololu.com/product/2133

9

If you are new, try testing the built-in examples before trying original code.

You can fix your code by either: 1) Adding a target to move towards:

#include <AccelStepper.h>

#define STEP 3
#define DIR 2

AccelStepper stepper(AccelStepper::DRIVER, STEP, DIR);

void setup() {

  stepper.setMaxSpeed(50);  
  stepper.setAcceleration(20);
  stepper.move(1000); //  <<<<   Set a position to move towards
}

void loop() {
  stepper.run();
}

...or else by: 2) Configuring instead for a constant speed:

#include <AccelStepper.h>

#define STEP 3
#define DIR 2

AccelStepper stepper(AccelStepper::DRIVER, STEP, DIR);

void setup() {
  stepper.setMaxSpeed(50);  
  stepper.setAcceleration(20);
  stepper.setSpeed(20);  //  <<<< choose a stepping rate
}

void loop() {
  stepper.runspeed(); // <<< make steps without adjusting speed
}
10

thank you for helping me with the code. the stepper motor now moves but it moves in a almost crunchy jittery fashion in only one direction. it steps fine when I manually supply 5 volts to the pins but not with the library. ) :

11

Hi, @danielleewilson

What do you mean?

Can you please post this code?

Tom.. :smiley: :+1: :coffee: :australia:

12

Isn't the Giga a 3V3 device, you may not be supplying a high enough logic signal to the stepper driver.
Check the driver specs.

Tom.. :smiley: :+1: :coffee: :australia:

13 
#include <AccelStepper.h>

#define STEP 3
#define DIR 2
#define TEST 4
AccelStepper stepper(AccelStepper::DRIVER, STEP, DIR);

void setup() {

pinMode(TEST, OUTPUT);

  //stepper.setMaxSpeed(20);  

  //stepper.setAcceleration(20);
  
  //stepper.setSpeed(10);
}

void loop() {

//stepper.runSpeed();

digitalWrite(TEST, HIGH);
delay(10);
digitalWrite(TEST, LOW);
delay(10);

}

this is my test code for the stepper motor it makes the motor move at a constant speed without skipping steps. Yesterday I got my oscilloscope working again and was able to look at the output voltage of the pins.

IMG_2920.HEIC
IMG_2920.HEIC3024×4032 2.27 MB

this is the output voltage of my test code, almost makes a square wave

IMG_2922.HEIC
IMG_2922.HEIC3024×4032 1.97 MB

here is the output from accelstepper. on the left side you can see a few dots. those are the little blips of voltage coming out of the Arduino. I had to up the intensity greatly and move the base line of no voltage out of the way just to faintly see the dots.

voltage with test code _ - _ - _ -

voltage with accelstepper _ ' _ ' _ '

the issue seems to be that when the library wants to step it sends a very brief signal which is often to short for the driver to detect. is there any function that lets the library increase pulse length?

14

the drv8825 can run with 2.2v - 5.25v

15

mobatools is not supported on Arduino Giga

16

I found a function for pulse width

17

https://www.airspayce.com/mikem/arduino/AccelStepper/classAccelStepper.html#af4d3818e691dad5dc518308796ccf154

image
image1128×492 49 KB

It defaults as 1us:

...but on slower hardware, the overhead makes it effectively longer. Fast hardware might need it explicitly set.

18

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