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Humidity Sensing of Zinc Oxide Nanorods Based Prototype Using Arduino Uno Microcontroller Platform

Here we report development of a zinc oxide (ZnO) nanorods based humidity sensor prototype using Arduino Uno microcontroller platform. A commercial humidity sensor (DHT11) was also connected with the microcontroller to calibrate ZnO sensor. ZnO nanorods were grown hydrothermally on indium tin oxide (ITO) coated PET substrate. Nanorods were characterised with field emission electron microscopy and X-ray diffraction. Sensors were exposed to 50%–80% relative humidity (RH) at room temperature. The sensor response was found to be 0–76%. Such low cost simple prototype development can open up opportunities for future realization of internet of things (IOT).