Abstract
Data acquisition system for barometric capacitive pressure sensor with high accuracy is present. The precision of the data acquisition system is less than 1fF, which improves the pressure sensor with high accuracy of 0.1hPa in the pressure range from 5hPa to 1080hPa. The data acquisition system consists of an AD7746 chip, an ATmega16 microprocessor, a 1602 LCD display and a pair of wireless modules. The capacitance data acquired by the AD7746 are transferred to a host computer using RS232 port via wireless module and display on the LCD in real-time. Preliminary results obtained from experiments show that this system fulfills the requirements of the weather observation and can be used in upper-air weather detection applications.
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