NOTES

If you are interested in robot construction, this circuit is essential to understanding the anatomy of robot bones. The DPDT relay is set up as an H bridge between the PIC and a motor. I put some LEDs in parallel with the motors so you can see the direction change. The motor was taken out of a siren light. I will use the mechanism from the light to make a rotating miniature telescope.

Relay DataSheet

PBasic Program

Relay contacts rated at
5A 250VAC
Relay coil 5VDC

Note the NPN and
Clamping diode

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H-BRIDGE with a DPDT Relay

VIDEO