thermistor table values

Question

thermistor table values

hurzl opened this issue 13 years ago · 5 comments

what are the "*16"s in thermistortables.h for? I have a 100k thermistor and the values are only correct when I take the 16s out.

Answer 1 · 2011-10-12T19:40:17.000Z

i have asked the guy who designed the first thermistor table ever, and he does not know.
you need to ask zalm, maybe he knows

Answer 2 · 2011-10-12T19:52:46.000Z

I had actually the same problem, for a reprap with a 10k thermistor. Its not in sprinter, i think zalm actually changed it. Should i use the thermistor tables of sptrinter instead?

Answer 3 · 2011-10-12T20:05:24.000Z

i know the reason, and know how to fix it.

Answer 4 · 2011-10-12T20:15:57.000Z

delete the "*16" fixed it for me.
I just would like to have it in the repo, so I don't have to fix it every time ;-)

Answer 5 · 2011-10-13T10:26:46.000Z

I made it configurable. The magic 16 was the number of temperature measurements that were added, before they were translated to temperature.Oversampling basically for additional numerical accuracy. I rewrote the temperature code to be useful for the AD595 chip, and took the code from sprinter where no oversampling occurs. That was the reason for the failure.
However, I am not really for that concept, because if you would use PID, the "I" would actually do some averaging already, as far as I understand.