Commercial wifi based temperature notification systems are available (e.g. Nest), but all I've seen cost >$50. I wondered if I could do a decent job of estimating ambient temperature using the CPU ...

This code runs on a jailbroken Kindle 4NT (Paperwhite). It uses the temperature sensor in the Kindle's CPU and displays temperature on the screen with a large font in Fahrenheit or Centigrade. To run, ...