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April 27, 2012
about 3 years ago
I just buy Quadstepper and I having some difficulties to make a motor run..please be patience, this is the first time that I try to control a stepper with PWM (before this I use a simpler serial controller)..I need simultaneous motor driving but with most things with fix or default values, so here what I’m doing for one channel/motor:
So, for basic test purposes, I just have connected to the micro-controller (a Roboard Rb-110) the: “Dir” and “Step” PINs. According to my oscilloscope, I’m sending the right test pulses, the “Dir” line is “Up” to 3.5v during the whole 1000uS period to indicate the direction and the “Step” line shows 100 Up/Down pulses of 500uS during the same period. The QuadStepper shows a Green LED On on the motor channel but the motor don’t do anything, absolutely anything (already try it with 2 different bipolar stepper motors), I know that perhaps I have the motor lines incorrectly connected, but I know that even in this cases the motor should tremble or something…but nothing, nothing at all.
May be the pulses are too quick?, too fast?, too short?, what do you recommend?.
Finally one thing that I don’t understand very clear: Currently the micro-controller is sending 3.5v as Up logic level, that mean that the “Jumper labeled 5v” on the QuadStepper should be “close” to “understand” 3v logic level?
In advance thank you very much.
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