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Setting potentiometer for strange motor shield

WaggyTheGeek2
By WaggyTheGeek2
in Hobby Electronics
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I have some pololu motor shields that are labeled "H4988", which looks significantly different from the a4988 model on their website. I am trying to set the potentiometer, but I can't for the life of me figure out where the negative end of my multimeter should go. Can anyone show me a pin diagram of this board? Or find an equation for setting it's Vref? Would be much appreciated. Thanks!

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