Analogue Thermometer

Stewart Kilburn

I have a Basic Stamp BS2

I spent a bit of time with these when i was at highschool 4 years ago and have just got the thing of getting back into it, Making lights flash etc, I know WOW.
Any how i am trying to help my girlfreinds dad set up his greenhouse, What i want to know is how to program in Resistor type Thermometers, Basically a potentiometer i guess? I have brought some Digital ones that should be here tomorrow, but i want to learn this type as it would be good for soil probs.

So could anybody help me with what the code should read to get a resistance that i can read out of the Stamp using Basic and calibrate.

If im not making sense please let me know.


Cheers Stew

stephenwagner

Stewart,

Chapter 7 of the original BS1 manual has a great example of using a thermister. You can use MSXcel to determine the proper equation and constants.
http://www.parallax.com/Portals/0/Downloads/appnt/stamps/bs1Appnotes.pdf

I hope this helps.

SJW
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Stewart Kilburn

SJW i am using a BS2 I tried that pot thing but you have to havea BS1?

Cheers Stew

Franklin

BS2 uses RCTIME to do almost the same thing. Read the editor help file on this for more info.

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- Stephen

Mike2545

Here is a snippet of a program for a BS2 that uses a ADC 0831 with the LM34 You can ignore the first part with all of the debug statments

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Mike2545

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stephenwagner

Forget about which processor to use. The point is the Parallax BS1 example clearly demonstrates how to straighten a non linear curve and keep the math under 16 bits.

NASA put a man on the moon in 1969 with a four (4) bit number cruncher.


SJW

Stewart Kilburn

OK???

Im guessing i need a A/D board to put a Analougue Sensor into the Stamp?

My Digital ones will be here on Tuesday, so i will read the Digital thermometer thread.