CNC Shield with DRV8825 controlled with rotary encoder

Projects General Guidance
1

Hello, I want to control a single stepper motor with a rotary encoder. I have all the parts required, I've successfully downloaded basic programs and made the stepper rotate using https://www.arduino.cc/en/Tutorial/LibraryExamples/StepperOneRevolution

I have just checked out the rotary encoder using a program I found working via the uln2003 driver and 28byj-48 5v stepper.

From that program I saw the Uno was taking the encoder signal on A4 and A5

I've checked and these correspond with SDA and SCL pins on top of the shield
I can also pick up 5v and gnd from the top of the shield for everything required for the encoder

I feel Ive got everything I need to start writing code but often after changing something fairly simple the program no longer works.

Appreciate any constructive pointers

Thanks, Jason

2

Checking the number of steps per revolution is a waist of time. Use the specs and let the stepper make its steps. Let it run 100 revolutions and check it stops at the correct position.

3

I dont need to check the number of steps, I just want to be able to move it with the encoder, I need precise control over the stepper, ideally with maximum resolution. The full range I need to turn the stepper is only 90 degrees. Just very precisely. I have reduced the gearing with a timing belt and 4:1 ratio reduction.

4

A stepper either moves exactly the steps it should or fail completely, stops any ware, standing still making noise. Use a stepper that has the torque needed.

5

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