The MIT team has successfully developed a miniature RFID sensor that can be used to detect moisture content in diapers to provide warning to nearby receivers so parents can change them in time, MIT News reported. And the sensor costs less than 2 cents to build and doesn’t add volume, making it ideal for traditional disposable diapers.
Newly developed RFID tags can be embedded in the current hydrogel of disposable diapers. But in a humid state, the hydrogel expands and becomes easy to conduct electricity, triggering the RFID tag and sending the signal to an RFID reader within a radius of less than 1 meter, without the need for electrical support throughout the process. The reader is then connected to home WiFi to send alerts to parents in a timely manner.
The RFID tag was developed by Pankhuri Sen, Sai Nithin R. Kantaredy, Rahul Bhattacharyya, Sanjay E. Sarma and Joshua E. Siegel. IEEE Sensors, journal.