Serial port thermometer, as simple as it gets, but no simplier
Download TempThingie-1.0.tar.gz Included are schematic and layout files for CadSoft Eagle and Linux source code
TempThingie is a simple serial port thermometer using just 1 TMP75 chip in SO8 package, 3 3.3V zener diodes and 3 resistors. It uses serial port control lines DTR, RTS and CTS implementing simple I2C bus.
Control program outputs measured temerature on stdout.
It was developed to monitor server room temperature at a company I work for.