Kwang-Min Park, Tae Wan Kim and Prof. Chong-Ook Park has developed mobile sensor array platform and its circuit. The array platform with four different materials will enhance the selectivity of chemo-resistive sensors which was the weakness in this type of sensors. The purpose of our array is to distinguish four biomarkers, such as Toluene, Acetone, Ethanol and H2S. When the mixture of these four gases flows in, each sensor detects the gases and exports the signal to the PC or Mobile Phone. This exported signal has been already calculated by MCU within the circuit and rearranged to figure out the concentration of each gas.