how easy/tricky is it to build a USB device that can control a motor speed? Just a smal electric motor that needs to ramp between a few different RPMs, no specific precision required..; just needs to be able to start/stop the motor, and change its speeds to a few different preset levels ..
I'm presuming that driver interface would be the harder of the 2 parts of dev (driver and hardware) .. What kind of hardware is best used to design a circuit like this?
Any pointers for pre-made circuits like this?
Thanks in advance!