The Dallas Semiconductor DS1722 digital thermometer attached to PC's parallel port allows measurement resolution as equal to 0.0625 °C in digital form and with linear response. The measurement range is -55 to +120°C, the part can use either three wire or SPI interface, and cost is approximately $1. In this application, the chip attaches directly the PC's parallel port through a male DB-25 connector. The data transfer takes place beginning with the write on an address byte to the chip's SDI in the order A7 to A0 (high bit to low bit). .
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|Published - 3 Oct. 2002