Researchers at the Massachusetts Institute of Technology (MIT) have developed a "smart" diaper equipped with a moisture sensor that can alert a caregiver when a diaper is wet. When the sensor detects dampness in the diaper, it sends a signal to a nearby receiver, which then sends a notification to a smartphone or a computer.
The sensor is made up of a passive radio frequency identification (RFID) tag that is placed below a layer of super absorbent hydrogel. When the hydrogel is wet, the material expands and becomes slightly conductive, which triggers the RFID tag to send a radio signal to an RFID reader up to one meter away.
The team estimates that the sensor costs less than two cents to manufacture, making it a low-cost, disposable alternative to other smart diaper technology.
From MIT News
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