Abstract
Publisher Summary This chapter focuses on interfacing various temperature sensors to microcontroller to measure and display the ambient temperature. Temperature measurement and control are one of the most common applications of microcontroller-based data acquisition systems. Four types of sensors are commonly used to measure temperature in commercial and industrial applications. These are thermocouples, resistive temperature devices (RTDs), thermistors, and integrated circuit (IC) temperature sensors. The project using a digital temperature sensor discusses the method by which interfacing a DS1620 type digital temperature sensor to the microcontroller can be done. The ambient temperature is measured continuously and then displayed in degrees centigrade on three TIL311 type alphanumeric displays. DS1620 is a digital IC temperature sensor and provides the output as 9 bits of digital serial data. Under the program listing, the display digit latches and the DS1620 control lines are assigned to bit variables at the beginning of the program. The used protocols are defined and assigned to global variables, for example, read_temp is assigned to hexadecimal number AA.
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