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sodonnell
Thanks waitaki,
With a Pololu sense resistance being .05 ohms and the stepstick being .2 ohms wouldnt it be higher then .8v? Or is there some variable I am missing?
A = VREF / (8 * RS), or rearranged, VREF = A * 8 * RS where RS is the sense resistor.
If with a Pololu your VREF was .4v and it had a .05 ohm resistor, your current was 1 amps. 1 amps * 8 * .2 ohms = 1.6 volts. This presumes that you have a StepStick that is built off of the reference design that uses a 10k trim pot and a 20k resistor for R1.