polulu a4988 driver

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hello, i've question,

does know why when put voltmeter probes on gnd pin , potentiometer realding goes few milivolts(the reading when electrodes in air) complete zero?
 
while im testing have connected should be, every voltmeter try show same things. (i'have tried 3 or 4 different multimeters, tried ac voltmeter:d).

at first thought drivers somehow damaged , unlikly because motors turning. , tried using oscilloscope , got reading.

(i have adjusted potenciometers, im curious why doesnt work vltmeter)

oh , if knows correct vref equassion accurate, realy use one, because have seen two, 1 in howtomechatrinox.com way off, , 1 allways whenever different datasheet on a4988 (i rated =v ref/(8 * r sense). did not work,  motors started shiver after set current twice high equassion said

my google shoots me directly pololu site, find formula:

quote
current limit = vref × 2.5
this applies if have original pololu a4988 0.05Ω current sense resistors.


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > polulu a4988 driver


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