A measurement system that consists of a pair of laser diode and photodiode coupled with an automatic data acquisition system based on microcontroller of AVR ATMega16 (hereafter to be called DAQ MA-16) has been developed for measuring optical response of polymer-based gas sensor. In this case, the optical response was represented by the voltage output of the photodiode. The polymer-based gas sensor was a thin film of polymer of Poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) or PEDOT:PSS deposited on a glass substrate. For measurement, the sensor was placed in the chamber, and then the gas ammonia with a fix flow rate was flowed into the chamber. The opposite part of the chamber was installed a pump to throw the gas. The National Instrument Data Acquisition (NI DAQ) BNC-2110 has been used to calibrate the DAQ MA-16 system. From the calibration, it can be estimated that the accuracy of DAQ MA-16 is about 99.4%.

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