This Teeny Sensor Fits In an Eyeball—and is Solar-Powered and Wireless [Sensors]


    A fascinating prototype of sensor the size of a cubic millimeter has been developed with a lot of brilliant technology inside—never mind that its specifically meant for glaucoma patients. The device takes measurements every 15 minutes and uploads the readings once a day by 400 and 900MHz frequencies. Because of the small size of its antenna it needs 47 microwatts to transmit a single bit using a pulse from a capacitor, since the built in battery only provides 40 microwatts. The capacitor repeats this process until it completes the total of 1.5Kb of data. The battery lasts for 28 days, but the system has one more trick in the form of a solar cell which charges itself over 10 hours of indoor of 1.5 hours of outdoor lightning. More


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