RE: Thermostat Hysterysis

["Dave McLaughlin" <dave@xxxxxxx>]

Hi Dean,

Strings on little microcontrollers are very hungry on resources if you use
lots of them. I try to put them in EEPROM if I can, especially those that
don't change much or I use a bigger memory device! :o)

If your house temp is negative, you are in trouble with your heating, or do
you live in the Arctic?

I use a 16 bit integer to store the value. This gives me -3276.8 to +3276.7
degrees C, which as you can see, is plenty  :o)

Which device did you say you where using? I used the AT90S2313 for mine.

Regards
Dave...
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Very funny Scotty, now beam down my clothes!!!
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-----Original Message-----
From: Dean Smith [mailto:ukha@xxxxxxx]
Sent: 07 October 2003 22:56
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Thermostat Hysterysis


Currently I've stuck with the DS1820's own scheme for the temp i.e. store
it
as double the real value (therfore last bit =3D 0.5 or 0.0). I match my
required temps and hystersis etc to that scheme so keep the 0.5 degree
resolution. - and use "Byte" throughout for that side.

Some of my string handling I think is too blame a little. Too much bad
practice from VB coming through ;) I think I need to explore storing a fe=
w
bytes in eprom or something.

Currently I've had to drop checking for negative numbers to get it to fit=
.
Hopefully that would never be an issue though :o

Dean

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