Journal of Electronics and Informatics
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Abstract
Flexible and sustainable pressure sensors have received considerable focus recently for use in wearable electronics, biometric monitoring, and human-machine interfaces. This study introduces a cheap, flexible pressure sensor using a composite material made of graphene and metal oxide deposited on a natural leaf scaffold. The hierarchical structure provided by the leaf scaffold improves the mechanical flexibility and sensitivity of the sensor. On the other hand, the composite layer enhances electrical conductivity and the piezoresistive effect. The sensor works based on the change in resistance when subjected to external pressure and uses a microcontroller to acquire and process data in real-time. A coin is used to calibrate the system to produce consistent pressure from 0.11 to 2.20 kPa. Finally, linear regression analysis is performed to obtain a correlation equation between the output voltage and pressure. Using this correlation, the output voltage can be predicted accurately without further calibration of the sensor.
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