The system presented in this application note implements a simple digital thermometerthat includes a built-in LCD and RS-485 communicat ion por t . I t is designed around Atmel’s AT89C2051 processor, a DS1620 digital thermometer/ thermostat from Dallas Semiconductor, a small 8 X 2 LED backlit LCD, and an RS485 line interface. The system,shown in Figure 1, can be used as the basis for developing custom solutions for networked and stand alone data collection and control equipment. It can be centrally powered due to its low current requirement and its small size allows it to be placed almost anywhere.
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