NFC is a really neat way to transfer data, and this passive NFC-based thermometer is a really neat application for wireless data transfer! It was featured on our sister website Hackaday a little while ago. Being able to have a digital temperature measurement device with you at all times that does not require any batteries or charging is super cool!
It’s based around the very power-efficient ATtiny1626 with 16kB of flash and 2kB of RAM all in a very small 20-pin package. Also on board is the 0.1°C accurate TMP117 and the RF430CL330 NFC chip for communication. The entire circuit is efficient enough that it can be powered just from the NFC field generated by your phone or any compatible NFC reader. In the time it takes for a standard NFC read to take place, the code on the ATtiny runs, grabbing the temperature from the TMP117 and then sending it to the RF430 for communication to the reader.
There are lots of interesting applications for this approach. It brings to mind a project by the incredible Ben Krasnow of Applied Science in which he showed his design for a similar NFC temperature probe but encapsulated inside a magnetic stir bar for use with lab heating and stirring plates. In theory, this design could also be encapsulated in a thin layer of epoxy resin or something similar and then could be used to read temperatures while immersed in liquids or in harsh conditions. The range for NFC depends on the strength of the transmitter’s field, so it is feasible to think that it could work inside some sort of plastic enclosure.
In any case, it’s something nerdy and cool to hang off your keychain, and you can get accurate ambient temperature readings anywhere!
source https://blog.tindie.com/2024/12/passive-nfc-based-thermometer/
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