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Registered Member #505
Joined: Sun Nov 19 2006, 06:42PM
Location: Yorkshire!
Posts: 329
Some good ideas there. I'm not too worried about table size as I've got 32kbytes of memory in the micro to play with and my table size is a 2 x 540 array of integers = 2 x 540 x 2 (bytes per int) = 2160 bytes.
Plus, having a lookup for every ADC count in a certain range means that I can subtract the minimum ADC value in the array from the actual ADC count to get the array location with the correct temperature in for a super fast lookup and no intermpolation (at the expense of a large table)
temperature = LUT [ temperature values ] [ ADC count - LUT [ adc values] [ first value ] ]
I haven't come across the LM35 before and it does look interesting. The cost of the TO92 version is the same as the thermistors that I had selected. As tobias points out, much easier to code, no LUT required. A bit more V/ºC would be nice but I think I could live with that.
Decisions, decisions... I think I might get an LM35 for evaluation purposes!
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
There's also the DS18B20, which has a single-wire digital interface. They might be a bit more expensive, but they are very easy to use, not requiring any AD-conversion, and already outputting temperature in degrees celcius with 1/16 degree resolution. Accuracy is not bad either.
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Thermistor Equation and Temperature Sensing
