Performance of AVR microcontroller-SMS gateway system for detecting SO 2 and NO 2

Abstract

This study aims to investigate SO 2 and NO 2 level in atmospheric air using AVR microcontroller-SMS gateway system. This system could gather high-resolution spatiotemporal air pollution data by GSM network of low-cost sensors for monitoring real-time concentrations of different air pollutants, which can be then utilized for a variety of air pollution management tasks. The system able to provide information with threshold values, Good (1-50PPM), Medium (51-100PPM), No Health (101-199PPM), Very Unhealth (200-299PPM) and Dangerous (above 300 PPM). Level of NO 2 is higher than NO 2 standard. Meanwhile in general, level of SO 2 is slightly higher than the standard value. The response time to the SMS communication system averages about 5 seconds depending on signal quality and data traffic from cellular service providers. Differences in Voltage and ADC measurements are caused by several errors, such as ADC ± 2 bit output error, rounding ADC conversion error to volt, or due to errors in the measuring tool used.