Performance of AVR microcontroller-SMS gateway system for detecting SO2 and NO2

This study aims to investigate SO2 and NO2 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 NO2 is higher than NO2 standard. Meanwhile in general, level of SO2 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