Re: Electronic thermostat



Mike Steward wrote:

I am looking for a cheap method of fitting some sort of thermometer to my
hot water tank which is heated from a log fire. The tank is built in to a
cupboard and very well insulated, therefore difficult to get at. I need
ideally some sort of digital read out in centigrade 0 to 100 deg.

The sensor would have to be on a cable about a metre long.

Any ideas ? Mike S.

Just the other day I saw a battery operated, indoor/outdoor thermometer for less
than US$10.00. Not sure where I saw it; maybe at BG Micro (Garland, Texas).
Don't remember whether or not it can read out in Celcius.

If I were doing it, I would use a microcontroller, an LCD, and a DalSemi/Maxim
DS1820 or DS1822 digital thermometer "chip" (because I've used all of them
before). As a matter of fact, several years ago I placed a DS1820 on the outlet
pipe of my (natural gas) water heater and ran the wires - 20+ feet of twisted
wire-wrap wire - to my livingroom, directly above, through an existing hole.
:-) The DS1820 and 1822 chips report temperature in Celcius, so you'd be all
set. (I wanted Fahrenheit, had to program the microntroller to convert.)

--
Michael
.

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