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On Sat, 10 Nov 2012, tom wrote:
Currently it looks the cheapest option to buy 3 kitchen 0.1c accurate LED thermometers (for the price of 1 thermocouple resistor WTF!) and modify them.
Do you really believe they're that accurate?I can connect an analogue LM35 sensor up to an Arduino - this has a 0-100C range over 0-5V and then I can get: 100 / 1024 = 0.098C resolution.
Does this mean it's really that accurate? No way. But I can display those numbers and it looks "good". Same as the kitchen ones are doing. It looks good, but it's no-where near accurate.
I will get one and see if whats in there - a pic and a small cct board I guess - if I can get the pic out without damaging it I can dump the code and see how it works and may be able to extract the temperature info one way or another. Calibration is a strange one - what does one calibrate against freezing and boiling are rarely where you think they should be!
Standard temperature and pressure... Good job finding that economically... Gordon -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq