DEVELOPMENT AND CONSTRUCTION OF \VEATHER DATA ACQUISITION SYSTEM WITH COMPUTER INTERFACING

Abstract

A precise weather data acquisition system capable 01 measuring temperature, pressure and relative humidity has been developed. The system has three sensors AD590JH for temperature, HIH3610-001 for humidity and 24PCCF6DA for pressure. Each sensor drives a sensitive transducer amplifier with high stability and low thermal drift. For the purpose of data logging of the measured quantities, a computer-interface adapter was also developed. It includes a TC7109A 12bits microprocessor-compatible analogue-to-digital converter (ADC). The ADC was connected in a way to provide the necessary handshaking and interfacing required to input 12bits through 8bits data port available on the parallel port of the computer. The software for the control, data processing and presentation of the result on a visual display unit of the computer was written in Q-basic and Visual basic. The constructed weather data acquisition system demonstrates an excellent performance with accuracy's of ±O.3°C for temperature, 0.1mbar for measure and ±0.5% for relative humidity