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Stepper motor controller

Might be tricky driving these with a 2-cell lipo battery, do you think?


Yes. The voltage of those two cells is probably nominally below the 8V minimum of the A4988 and the 8.2V minimum of the DRV8825.

- Ryan

Yet this motor pololu.com/catalog/product/1207 is spec’d at 7.5 V. Am I right in thinking it can be run higher?


Yes. We have a FAQ about it.

- Ryan

Excellent. Thanks Ryan.

Hi Jan, here’s another:

I agree, a stepper controller would be great.

Also, how about a stepper motor tester? I made a crude one using a PIC processor, some Basic code and crude connection scheme so I could test my 200 stepper motors. My program allowed me to connect the 4, 5 or 6 wires of the motor to spring posts, run the program and determine by observation which one of the 6 cases I tested gave the smoothest spinning. From that I deduced how the wiring must be, which ones are pairs and which ones are not and the polarity of the wires. You could expand this to try to determine # of steps,degrees/step, test the current draw, etc. For # of steps, you could publish a protractor kind of guide that you could mount over the stepper shaft.

I tested at 5 volts to start and when I got poor spin or low torque, I upped it to 12 volts.

Hi, queenidog.

Thank you for the suggestion. It sounds like the test unit you made might have been helpful for you since you had to test so many motors, but it seems like you should be able to tell most of those things just using a multimeter, and if you don’t have specs for a motor, doing something like “upping it to 12 volts” might destroy your motor anyway.


Yike, it looks like this thread is almost 10 years old! It took us a while, but we’re finally making a family of stepper motor controllers! The Tic stepper motor controller can control a single stepper motor through one of six control interfaces: USB, TTL serial, I²C, analog voltage (potentiometer), quadrature encoder, and hobby radio control (RC). The inaugural member is the T825, which features an integrated DRV8825, and more versions based on other drivers are in the works (for example, the T834, which features the DRV8834, should be available in a few weeks).

- Ben

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