This is a quick knock up circuit I did on http://circuits.io/
The AT-Tiny uses three wires RX, TX & GND to communicate with the controller. The protocol will say which pump 1-4 and how many mL and the At-Tiny will take care of the rest. Just keep the Enable lines up, no need to for anything else as we're not changing direction or anything. I've left off the possible 4th pump as I haven't got one.
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