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[aprssig] Chemical sensors

Spider spider at rivcom.net
Fri Oct 8 23:58:40 UTC 2004


I think it needs to go way beyond the spec and into a new relm.  I would 
suggest this sort a telemetry packet that could also contain weather 
sensors....not the other way around.  We waist a lot of space in a packet 
dealing with locations....which is NOT necessary for sensor data.....for the 
vast majority of sensors.  This is where Meta files enter into the 
picture....and we should consider this.....me thinks!

Jim, WA6OFT

----- Original Message ----- 
From: "Brian Riley (maillist)" <n1bq_list at wulfden.org>
To: "TAPR APRS Sig" <aprssig at lists.tapr.org>
Sent: Friday, October 08, 2004 2:54 PM
Subject: Re: [aprssig] Chemical sensors


>
> I second the motion .... We need to look at the spec to see how best we 
> can
> create an extensible telemetry set ... Do we modify the weather data 
> format
> or do we modify the telemetry format or do we create a new frame, it must 
> be
> open ended and provide for easy extension to new kinds of data.
>
> The problem I see is one Bob has pounded on, one frame should not depend 
> on
> reception of a prior frame. So maybe data should be sent
>
> : ssss ttdddd ttdddd ttdddd ttdddd ... cccc
>
> where ssss is a sequence number in hex, tt is hexadecimal data type, and
> dddd is data in hex and ccc is CRC16 of the data and sequence, that gives 
> us
> 255 data types, and 16 bit data. How big can we make it? If you have more
> values to send, generate an additional frame. 255 not enough do three hex
> digits or maybe base 91.
>
> I was thinking we could add a 'data set identifier' and it would be a 
> simple
> single char indicating that the data type identifier is part of a 
> 'standard
> set' some specific set ... Or nonstandard set ... Then the APRS Clients
> could see that and if it were a standard set it could decode it and if it
> were not it would leave it alone.
>
>
> ... Just thinking put loud
>
>
> On 10/7/04 11:18 PM, "Spider" <spider at rivcom.net> wrote:
>
>> Not to change the subject...because it really fits.....There are 
>> discussions
>> taking place about adding extra sensor data to a weather packet.
>
>  [deletia]
>
>> I also have two  O2 sensors for entering into places that might not let a
>> person breath too well!  So there are all sort of neat things people 
>> could
>> explore using sensors and APRS.
>
>
>
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