Computerized Thermometer Using PIC and RS232 Interfacing

Abstract

This paper aims to develop a computerized thermometer using PIC and RS232 serial interfacing. The analogue temperature sensor is used to detect the real world temperature. The temperature sensor produces analogue changes in voltage with respect to the detected temperature. These changes in voltage are applied into the microcontroller. The analogue to digital converter in the microcontroller digitizes the detected temperature. The microcontroller outputs the encoded temperature values in the form of RS232 compatible frames format. The level converter circuit converts the microcontroller’s output voltages into the voltage levels of RS232 serial interfacing. The computer system reads the RS232 port and produces the screen readout of the detected temperature. The temperature can be obtained in degree Celsius as well as in degree Fahrenheit.