When these materials are subjected to mechanical strain, the piezoelectric effect generates electrical charges, which can be collected and stored for powering small electronic devices or sensors.
The piezoelectric effect is simple in its rules ... When the strumpad is strummed, six copper strips act as capacitive sensors. Touching the strips determines which notes will be played.
Prof. Ryu explains, "Our study explains the materials and device fabrication strategies for tactile sensors using piezoelectric and triboelectric effects, as well as the types of sensory recognition." ...