You can also add a second driver and motor.
Just take the signal feeds and get your power from your transformer.
Same signal, so in lock-step, dual power so no overloading of the Tiny and full power to the steppers rather than half. Still need to reverse the power for one motor manually.
You can balance the motors quite easily by coupling them (a piece of plastic tubing works). By utilising the brake on one motor, have the other step in 1:1 single step increments, if it’s unable to overcome the braked motor, adjust the power until it can, then reverse your test. It’s crude but reasonably accurate.
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This reply was modified 7 years, 10 months ago by Zootalaws.