Can you post a link to your stepper motors specifications? What are you using to supply power? What do you have the VREF voltage set to on your DRV8834? Also, can you post some pictures of your setup that show all of your connections?
I tried .5 v voltage reference but then saw the stepper spec says .6a so
not sure what I should have for reference voltage.
I have tried different mV but never works.
The green led is on the Step wire strip. On other steppers the led would
light on each step.
It does not light while connected to the DRV8834 but if I connect the step
wire directly to the led without the DRV8834 it flashes.
From your pictures it is clear that you have the boards orientation wrong in relation to the pins you are connecting to. It looks like you have your power input connected to the STEP and DIR pins and your input signals from your Arduino connected to the VIN and GND pins. All of the other pins are similarly connected incorrectly. You can try fixing your connections and see if the board works; however, please note that connecting your input power to the STEP and DIR pins might have damaged the DRV8834. If the board is damaged, you can send your order information and a reference this forum thread to support@pololu.com, and we will see what we can do to help you out.
I moved your post to your previous thread since it seems like you are still using the same setup and driver.
Your current limit is set a little too high for a 600mA current per phase rating; you should set your VREF voltage to 0.3V. How are you measuring the output of the DRV8834 carrier? Also, can you post updated pictures of your setup?
EDIT: I posted this on the previuous thread so this post in out of order and should be before Ralph’s last post.
Thank you for posting the updated picture. Those connections seem fine. Your previous post made it sound like you might have been measuring the output of the DRV8834 carrier at the motor output pins and not just the VREF voltage. If you are getting good signals at the DIR and STEP pins and the driver is not stepping, it might be damaged from your earlier setup as I mentioned previously.
I am using a new DRV8834 and new stepper motor. Same results. Here is a video the first half I am showing Vref then I switch to measuring motor output pin voltage.
At times I am seeing >8 volts at the motor pin.
I noticed that your soldering shows signs of improper wetting; can you try touching up your soldering to see if that helps? Can you also test your connection wires to be sure each of them has proper continuity? Also, can you tell me the voltage and current ratings of your power supply?
By the way, your video is in a format that only plays in Live Movie Maker, can you repost the video in a more standard format? You might consider posting your video on YouTube and post a link to it here.
The current reading on your power supply is not a good indicator of the actual current to your stepper motor coils. If you want to measure the DRV8834 output current you should connect a multimeter in line with one of your stepper motors coils. However, your power supply should be fine as long as you do not have the supply’s current limited set to below about an amp. Did you touch up your soldering and test the connection wires? Can you post updated pictures of your soldering?