Is there such a relay board where i could connect from my receiver to reverse motor polarity on 4 small 5v motors individually?
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Easiest way would be to use a cheap, reversing "brushed" ESC for each motor, like are used in inexpensive trucks and boats.
Like this ($13 for two) https://www.amazon.com/gp/product/B0...0?ie=UTF8&th=1
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