First I have to build a prototype and test the device with various settings in terms of rpm and power. I would like to set:
· Starttime and stoptime for both motors
· Runtime for both motors
· RPM per motor
· Direction
This will have to be set in the software (fixed program) and this will be used for the devices to be sold.
What the device will have to do is this: (don't pay attention to the Pololu Baby Orangutan name)

I have to see if it would be better to power the motors directly from the battery due to the high current to the high pressure pump. If that’s possible via a relay.
The device will run the same simple program over and over. A microcontroller and driver seem to be an overkill. Which components can be used just for this simple task?