Circuit Project Electronic

You can build a variety of simple machines with the same hardware and a different script : a charting thermometer, a vending machine that dials your number when empty, a leavening cell… thermometer with 1°F (0.5C) resolution four switch inputs, four relay outputs only an handful of cheap parts graphic LCD display
Read more original source:
http://www.geocities.com/CapeCanaveral
/Launchpad/3632/scriptherm/scriptherm.htm

The LTC1392 is designed to be used for PC board temperature and supply voltage/current monitoring or as a remote temperature and voltage sensor for monitoring almost any kind of system. It is available in SO-8 and DIP packages allowing it to fit onto almost any circuit board.
Read more original source:
http://www.linear.com/pc/downloadDocument.do
?navId=H0,C1,C1155,C1001,C1158,P1039,D4307

Remote sensor sends data via mains supply
Temperature range: 00.0 to 99.9 °C
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor’s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts [...]