2025 · embedded
RFID drawer lock
ESP32 + MFRC522 reader unlocks a 9 g servo bolt when an enrolled card is presented.
RDL
Whitelist of card UIDs lives in NVS so it survives power loss; reader is hidden behind 1 mm of PLA at the front of the drawer (RFID still passes). 18650 cell + boost converter keeps it locked for ~6 weeks idle. Audible click on success keeps the user experience clear.
Tools
ESP32MFRC5229 g servo
Materials
PLA