Kit 145 is a PC controlled 4 channel temperature meter (either deg C or F) using the serial port, a PIC12C509 and 4 x DS1820. No external power required. We think that each DS1820 may be located over 200 meters away from the motherboard and PC. This is an ideal use for old 386 and 486 computers: continuous temperature data logging. Users will have to massage the input data stream to their purpose. It may be dumped into an Excel spreadsheet, or they can write BASIC programs using the INPUT command to grab the readings. As you can see from the photo there is not much to the hardware.