With the addition of one capacitor, one relay, and a small piece of wire we can convert an inexpensive wireless doorbell into a remotely controlled relay useful for a wide range of applications. These include remote PC starting, lighting control, Halloween effects control, or virtually anything that can be controlled by a pair of relay contacts.

And here’s some food for thought for you DIY’ers. How about taking one of those cute small radio controll cars and turn it into a dimmer control? The benefit of using these small cars as a build base would be that the rf reciever cards are very very small.

Link: Turning a wireless doorbell into a remote control relay