How do I connect a switch without wire to a buzzer

In this project, I need a 4mm by 4mm or smaller on-off switch that is waterproof. Is it a
MEMS or a piezoelectric switch? The receiver and buzzer is 4 feet away. Can I buy the switch and receiver as a unit?
Any suggestions would be appreciated.

My guess is that you want to build your own unless you want to hack a part a garage door opener.

For my first RF project I used "Laipac RF modules":http://www.laipac.com/rf-receivers.htm

Or Infra Red LED / Receiver

If you drill a hole through the frame sufficient for an IR led, this would be possibly better since you might have difficulties with persons who like to jam or interfere with RF frequencies especially 455 MHZ

In conjunction with this you don’t have to worry about the DTI complaining that you are interfering with other radio frequencies

There are of course the remote IC’s supplied by Maplin,s which give five channel decoding ,encoding ,with which you can use Infra red diodes pickups with slight alteration to the circuit

Or alternatively use the Phillips or Sony IR code and program a suitable PIC cpu to do the job of infra red / TX – RX

Or you could use very plain and simple RS232 protocol asynch to drive the led with another processore ready and waiting to recieve


You could further enhance this and produce a readily available attachment to a mobile phone which notifies you in the garden or elsewhere on your mobile phone to let you know someone is at the door by sending you an SMS

OR if you really fancy produce software with suitable attachment to the PC which automatically networks your bell message to a selection or receivers of your choice

One step further utilise bluetooth modules providing serial over bluetooth protocol or just simply IRDA

Finally if your bell is in a different room of a hallway or similar then you could add a simple TV remote extender which is essentially a repeater

There a stack of ideas for you to enhance on


All would work and very well they would too


Mark

www.harrington.force9.co.uk

I was thinking about the IR solution to this as well. The only drawback of the design (as opposed to some of the other RF methods you mentioned) would be the line of sight issue. I have had issues with my IR LED / Sensor designs in the past because something blocked the line of sight, cutting off communication. It does seem like the easiest way to approach the problem, at least in my opinion.

Yes correct line of sight but having said this what about using mirrors I recall quite a clever design utilizing Mirrors for an alarm system Or you could use prisms found in binoculars