If you want to use RF then take a look at the ALERT format by the American
National Weather Service, it is quite simple. In your case for shuch a short
distance, how about infra red? Is a hardware link not acceptable?

Dennis




> -----Original Message-----
> From: Gerard Mantoux [SMTP:Gerard.Mantoux@BULL.NET]
> Sent: Tuesday, 23 May 2000 18:02
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Advice needed  ==>PIC to PIC wireless transmission
>
> Hello, dear PICListers,
> I need advices, concerning one way wireless transmission of data between
> two PIC
> 16F84 (short range, 10-20 meters)
> My project :
> Outside: an autonomous weather station (Wind speed, temperature and rain
> gauge),
> using a PIC 16F84, and powered by solar cells and battery.
> Inside :a terminal part that uses a PIC 16F84 too with LCD display.
> I plan to use a one way wireless transmission between the two 16F84, using
> 432MHz commercial modules : (1 time per minute, emitter on the station,
> receiver
> on the terminal).
> Does any of you have experience with reliable way of doing this Wireless
> transmission (kind of protocol, modulation,etc.), or site to visit or code
> snippets to grab.
> MTIA
>
> FYI -
> I have finished a one year old hobbyist project, a LCD frequency counter
> Range few Hz to over 1.2 GHz
> 16F84 (sampling rate ~1.2 sec.)
> ECLinps input stage and prescaler (SMD components)
> TCO 10 MHz for 3 ppm accuracy
> 16x1 LCD display 10 digits display (resolution 1Hz)
> Input A : few Hz to over 200MHz input level 200mv
> Input B : 1 MHz to over 1.2GHz 400 mv
> Power 4x1.5V AA cells + DC/DC converter -  auto off, low battery warning
> I will try to put it on my first web site in the coming months
> I established also the schematic for a simpler version with 120 MHz range
> only
> (not tested)
>
>  [Gerard Mantoux           email: gerard.mantoux@bull.net
>  Bull S.A.   38, Route de Versailles    tel: (33) 01 39 66 50 90
>  78430 LOUVECIENNES, France        fax: (33) 01 39 66 67 94
>  OPINIONS ARE MY OWN & DO NOT NECESSARILY REFLECT BULL POLICIES]