[sci.electronics] Remote Garage Door Opener

howe@liszt.mpr.ca (Randy Howe) (10/24/90)

I need to build a device similar to a remote garage door opener. I
want a small portable rf transmitter that sends a coded transmission
to a receiver which verifies the proper code and then turns on a
relay.

I thought I would use the same chip set as the Stanley garage door
opener but have found out they are custom chips made only for
anley.  Does anybody know of some other devices which I couldld use.

Thanks in advance.
 

cgordon@vpnet.chi.il.us (Crash Gordon) (10/26/90)

>Author: [Randy Howe]
>I need to build a device similar to a remote garage door opener. I
>want a small portable rf transmitter that sends a coded transmission
>to a receiver which verifies the proper code and then turns on a
>relay.

Motorola (and others) make various chips intended for use in IR remote
controls which could probably be used over RF instead.  You'd need to add a
4-bit controller or something like that to read the codes...

Also, I've seen ads (in ECN, I think) for someone selling keychain
transmitter systems like the ones used for car alarms.  They're targeting
OEMs, not end users, price for XMTR/RCVR pair was around $80.

-----------------------------------------------------
Gordon S. Hlavenka            cgordon@vpnet.chi.il.us
Disclaimer:                Yeah, I said it.  So what?