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This paper presents the design and development of a low cost Data AcquisitionSystem (DAS) using PIC12F675 microcontroller for real time temperature andhumidity monitoring. The designed DAS has 4 analog input channels having 10-bitresolution and was interfaced through the serial port of the PC. A precisionintegrated temperature sensor and an instrumentation-quality RH (RelativeHumidity) sensor were used for sensing the temperature and humidityrespectively. The firmware was written in Basic and compiled using OshonsoftPIC IDE and downloaded to the microcontroller by using PICkit2 programmer. Anapplication program was also developed using Visual Basic 6, which allowsdisplaying the waveform of the signal(s) in real time and the data can be savedinto the hard disk of the computer for future use and analysis. It can also beinterfaced to the USB port of the PC or laptop using USB to serial adapter BAFOBF-810. Thus, the designed low cost device works with the legacy hardware aswell as the modern USB interface.

Design and Development of Low Cost PC Based Real Time Temperature and Humidity Monitoring System