Chris from PyroElectro writes:
Here’s an article that explains how to build a dual DC motor control system, combined with a wireless receiver and transmitter (XBee modules) which tell the motors at what speed they should move forward, or backward. Standard and widely available parts are used so that anyone can follow along.
The system uses a PIC 18LF4520, LM317 variable voltage regulator, 1mW XBee modules, 3v or 6v DC motors, SN754410NE Motor Controller IC, 2N2222 NPN Transistor and a handful of discrete components. The article contains links to the schematics for receiver and transmitter and source code for the PICs.
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