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tamiya dual gearbox

DIY encoders for tamiya dual gearbox

Hi, Want to add encoders to my tamiya dual gearbox, since i'm using bulky opto switches, i have easy access to a gear that rotates 7 times per revolution of the wheel, i thought of making 4 holes on that gear(in a north, south, east, west orientation), reckon 28 pulses per rotation will be enough?