Idea for wireless switch

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Jeffrey Peter

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Hi, I have a Call bell operated using 3V battery. It has two terminals, if I short the terminals then it would ring. I want to operate it using wireless switch up to a max of 20 meters approx. I don't want to use micro controller..
So what are the other methods can use ?
Thanks in advance
 

you can use a small RF transmitter receiver for this purpose
 

There are store-bought wireless doorbells. You might hook up the receiver unit so it turns on your existing bell.

Or consider using light beams, or ultrasonic signals. It may be difficult to make it reliable however.

There are radio modules (transmitter and receiver) that you can purchase.
 

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