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. https://www.siliconrepublic.com/machines/underwater-iot-sensors-no-battery-space
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BATTERY-FREE IOT SENSOR THAT LASTS FOR YEARS COULD BE SENT TO DISTANT PLANETS
A team of MIT researchers has unveiled a battery-free underwater sensor that can transmit data for extremely long periods of time. According to MIT News, rolling out a network of these sensors could be used to monitor sea temperatures, study climate change or even be used for underwater internet-of-things (IoT) networks on distant planets. Explaining the technology, the team said a transmitter sends acoustic waves through water towards a piezoelectric sensor that has stored data. Each wave that hits the sensor creates electrical charge that is then stored. While early days, the sensor was able to transmit 3Kbps of data from two sensors simultaneously at a distance of 10 metres between sensor and receiver. COLM GOREY READ MORE