Study of low-cost Arduino Uno based system to determine the response and recovery times of humidity sensor

Abstract: In this work, we have studied humidity sensor behaviours with a low cost experimental setup using Arduino UNO board. The proposed technique exploits sensing capability of the DTH22 sensor, to determine its response and recovery times. The D.C voltage of +5V is applied to the sensor and the output voltage is measured using Arduino UNO board with the help of buffer circuit. The sensor has shown response time of 8s and recovery time of 1s. This study emphasised that the DHT22 sensor is a better humidity sensor between 9-99% RH.

Keywords: Arduino uno, Embedded system, Sensor, IC 741 op-amp , DTH 22, recovery time and response time.