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Pin MS1 of the ramps board is already linked to GND
So if you want to use SpreadCycle mode 16 micro steps and 256th interpolation you need to:
-remove all jumpers from MS1, MS2 and MS3
Irms = (Vref * 1.77A) / 2.5V
Vref = (Irms * 2.5V) / 1.77A
exemple: FOr 1V measured on Vref, the Motor current will be 0.71A
1V = (0,71A * 2.5V) / 1.77A
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