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RAPS Power Stepper Driver with 1/128 Microstepping board features:
CAUTION: Inverted activation signal Enable = HIGH (at Pololu drivers enable = LOW, invert in firmware!)
The arrows indicate the measurement points for the reference voltage. Use a voltmeter and measure the voltage between the ground terminal and the pot wiper on the driver’s v-ref potentiometer. Recommended voltage range: 0.8 to 1.6 V. This corresponds to a theoretical peak engine power from 0.73 to 1.46 A - See more at: http://doku.radds.org/dokumentation/raps128/#sthash.zP5eGPrn.dpuf
By turning the decay potentiometer, the way of voltage and current decay in the motor coils is changed. A medium setting has been proven to work with many Nema 17 motors.
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