Has anybody used or played with the on chip internal temperature sensor on the uno. There is reference to it in the 328 and tiny 48 data sheet (section 23.9) which gives some code to directly access the registers, but what about using it alongside the other analog pins on the arduino? If there is code around for doing both in the same sketch then I'm not looking in the right place and would be gratefull for any pointers?
There have been postings on the use of the internal temp sensor from time to time, you just have to search a little. However in my opinion it's a pretty worthless (in my opinion) sensor as the chips internal temperature is going to be more effected by how much current the output pins are having to supply to their external circuitry. So maybe if you are not using any output pins, or they are supplying only minimum and steady value current, it's possible to utilize the sensor somehow. As I recall it requires quite a bit of calibration effort even then.
So first question is what is it that you are expecting to be measuring with the sensor and what will you do with the information from it?