Passive high accuracy NFC thermometer, keychain compatible form factor.
Designed by unsurv technologies in Germany
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What is it? nfc_temp is a "dumb" NFC tag based on the ATtiny series from Microchip and the dynamic NFC IC RF430CL330H + TMP117 thermometer from Texas Instruments. It measures ambient temperature with…
Read More…nfc_temp is a "dumb" NFC tag based on the ATtiny series from Microchip and the dynamic NFC IC RF430CL330H + TMP117 thermometer from Texas Instruments. It measures ambient temperature with a twist. Just like the old days: never run out of battery on your thermometer, phone is always charged anyway right?
Hold it near the tag and the PCB will siphon some energy from the reader field to power itself at read the temperature from the 0.1 °C accuracy TMP117 thermometer. The ATtiny will compute the temperature value and send it to the NFC IC so the reader can read it in time before the time window for a single read closes.
I worked on a low wireless footprint device to track surveillance cameras you have come into contact with. For this I worked closely with the RF430CL330 dynamic NFC. The inspiration to create a passive device came from one of the example use cases. Because of size constraints I needed to rework the TI approach and used an ATtiny series microcontroller combined with a digital thermometer. With these changes you can even reprogram it via the Arduino IDE given you have made some modifications to be able to program with Microchips UPDI single wire signaling tech.
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Michael | May 4, 2024
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