Duinotech Fingerprint Sensor Module for Arduino & Raspberry Pi – 44 x 22mm, 3.3V TTL Serial

You've got a smart-lock project or an access-control build, and you're tired of fumbling with keypads or RFID tags that anyone can clone. This little 44 x 22mm module reads a fingertip, stores the print, and lets your board make the call. Runs on 3.3V, talks TTL serial, and gets smarter every time someone swipes – the auto-learning routine tightens recognition so you stop re-swiping at the door. Works with Raspberry Pi and Arduino. One heads-up: because it uses a Serial connection, boards with multiple serial ports like the Leonardo or MEGA play nicer than an UNO, which is already using Serial to talk to your computer. Jaycar's own Arduino library is on GitHub, so you're not reverse-engineering the protocol at midnight

• Compact 44 x 22mm form factor – fits tight enclosures and PCB layouts
• Auto-learning recognition improves accuracy with each scan
• Runs off 3.3V, communicates via TTL serial
• Compatible with both Raspberry Pi and Arduino platforms
• Jaycar-authored Arduino library available on GitHub for quick setup
• Best paired with boards offering multiple serial ports (Leonardo, MEGA)