Erratic move
Forums:
Any idea why I have such erratic moves when running zbStepperSequence.py ?
Video Link: https://goo.gl/photos/d2XKrah9yj5qTkD26
Using a LDO-42STH47-1684A stepper. Specs link: https://cdn.solarbotics.com/products/datasheets/ldo-42sth47-1684a.pdf
I adjusted the code to match the specs:
root@raspberrypi:~/zeroborg# diff zbStepperSequence.py_orig zbStepperSequence.py 10,11c10,11 < voltageIn = 8.4 # Total battery voltage to the ZeroBorg (change to 9V if using a non-rechargeable battery) < voltageOut = 3.0 # Maximum stepper motor voltage when holding / turning --- > voltageIn = 9.0 # Total battery voltage to the ZeroBorg (change to 9V if using a non-rechargeable battery) > voltageOut = 2.8 # Maximum stepper motor voltage when holding / turning 25c25 < stepDelay = 0.002 # Delay between steps --- > stepDelay = 0.003 # Delay between steps
piborg
Fri, 03/17/2017 - 21:28
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Tweaking settings
The most likely explanations are that the delay is not long enough or that not enough power is getting to the stepper.
I would start by making
stepDelayrather large, for example0.1.If the large step delay works then you can experiment with lowering the value until you find the lowest setting that works correctly. If it does not work then you need more power.
If you need more power or the delay still seems excessive after experimenting try slowly increasing
voltageOut, probably by about0.1at a time until the motor moves correctly. You may find the voltage from the ZeroBorg is actually a bit lower than the number specified, especially when using batteries.