1.2 KiB
Sonicare Brush Head ID
Each modern brush head for a Philips Sonicare contains a Mifare Ultralight NFC chip (NTAG213). The chip not only signals to the head unit what type of brush it is (to pre-select the recommended mode) but also the recommended lifespan. Usually 6 hours, which resemble 180 brushes (2 minutes each), and, assuming 2 brushes per day, this is 90 days = 3 months. The time after which you should replace your toothbrush (or the head in this case).
The main unit also writes the time you've used the head back into the NFC chip. If you reach the 6 hours, the "replace head" indicator will light up.
The NFC chip is write-protected with a password that can be derived from the UID and MFG code. The algorithm for this has been reverse-engineered by atc1441.
Features
This Flipper Zero app will scan the NFC chip and show the UID, MFG code, lifespan, as well as the used time. It'll also generate the NFC password.
TODO
- determine brush head type from data
- allow writing back modified data (different type, reset usage)