With the aid of a PC and intelligent temperature sensors it is very easy and quick to assemble a professional temperature data-logger. Using email, up to four temperatures can be monitored from a distance. The sensors are simply connected to the PC parallel port.
In this article we describe a system that measures and records temperatures. The heart of the system is a Visual Basic program. This software reads the temperature sensors, whichare part number DS1621 from Dallas Semiconductor. Up to four sensors can be connected. The measurement accuracy is 0.5 °C and the interval between successive measurements is 2 seconds, 10 seconds or 1 minute.