A Whimsical Doorbell
The use of radio frequency (RF) control for switching devices is becoming increasingly popular. The project described here uses RF control to actuate a zany, whimsical doorbell. The electronics involved in this circuit can be used to control more practical projects, such as a garage door opener, appliance turn-on, wireless home signaling (paging), and remote sensing.
Selected questions from past Q&A columns.
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