(MM) wild temp sensor readings


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TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 4447
Posted: 05:53am 13 Jan 2012      

Pete

This is my circuit


I have put a 0.01uF capacitor from point A to ground on some of the long leads.

To get the scaling factors, I measured the Maximite voltage at a known temperature and calculated it from there.
With 4 sensors my program looks like:
scaled(3)=av(3)*168.5-273
scaled(4)=av(4)*168-273
scaled(5)=av(5)*168.3-273
scaled(6)=av(6)*169.5-273

I take readings every 10 seconds and average them over 5 minutes.
The variations between sensors is not worth worrying about in my situation.
The location of the sensor causes the biggest errors and within one degree C is more than enough.

Cliff,
No chance to play with the CGMMSTICK yet, the wife cam out of hospital yesterday. I think I had more time when I was spending all the day driving to and from the hospital visiting.
Just waiting for her to go back to sleep....

Jim


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