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PICList Thread
'Advice needed ==>PIC to PIC wireless transmission'
2000\05\23@040348 by Gerard Mantoux

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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: spam_OUTgerard.mantouxTakeThisOuTspambull.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]

2000\05\23@042437 by Plunkett, Dennis

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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 removed}

2000\05\23@191543 by David Huisman

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Gerard,
Drop us a line .....enquiriesKILLspamspam@spam@orbitcoms.com

or visit our site http://www.orbitcoms.com

Regards
David Huisman

2000\05\27@022923 by Dan Mulally

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----- Original Message -----
From: "Gerard Mantoux" <Gerard.MantouxspamKILLspamBULL.NET>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Tuesday, May 23, 2000 2:02 AM
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
{Quote hidden}

only
> (not tested)
>
>  [Gerard Mantoux           email: EraseMEgerard.mantouxspam_OUTspamTakeThisOuTbull.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]

Usually that's done with ASK, amplitude shift keying. This is what most
garage door openers use. The transmitter can be done with one transistor
oscillator which is keyed on and off by the data. The receiver is a bit more
complex but still not too bad. Most receivers are super regenerative. I'm
not sure off hand where to find plans but you could buy a cheap remote
on/off switch from Radio Shack and copy it. Digi-Key also has some remote
control stuff made by Ming Microsystems.

Dan Mulally

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