hi
    it's all been done before all u need is 2  um3570 s or Holtek HT-12D u
don't relay need a pic but if u relay muse have a pic the holtek chip will
interface easily  look in the maplin's catalogue for apps or they may even
have data sheets on their web site

----- Original Message -----
From: "Peter McAlpine" <mcalpine@GME.NET.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, February 10, 2000 9:57 PM
Subject: key transmitters


> Hi all,
> I need to build a transmitter / recevier that sends
> a data code, with the transmitter being a keyfob
> type (aka remote entry on cars).
>
> Anyone point me in the direction of any circuit ideas
> on this?
>
> Also, the Microchip keyloq device with code hoping,
> can it send a unique data code that can be passed
> through to another micro on decode? I need
> multiple users with different codes to unlock
> a device, and log who used it.
>
> Thanks!
>
> Regards
> Peter Mcalpine
> www.ozemail.com.au/~petermca
> www.wrx.org.au
>