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Temperature Controller Based on AT89Cx051: The TempRat is going to be a little device to switch things off if the ambient
temperature rises above a definable level. A certain time before switching off, a message is sent down the serial link to the host computer telling it how long until the power will be switched
off. The TempRat will then switch things back on once it thinks the temperature has gone back to normal. The TempRat displays the ambient temperature on a 2 digit display, and also sends the
temperature down the serial link once a minute for a c omputer to log or monitor. All critical temperatures and time delays are settable, and stored in EEPROM in case the power fails. The
TempRat has an operating temperature range of 0 degrees to 70 degrees. (added 4/05)
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