Edward Mallon writes, “I’ve managed to get cheap thermistors calibrated to about to +/- 0.2C with 3.3v Arduinos. Instead of playing whack-a-mole with the various sources of error, I simply rolled them into some synthetic Steinheart-Hart constants, and I was able to get the therm’s output onto the reference line from a si7051. The cool thing about ti is that the thermistor, and the reference sensor cost less than a single high precision thermistor would have. Not sure if this approach would work beyond 40 degrees of range, but that’s good enough for my purposes.”
More details at Edward Mallon’s blog.
Via the comments.