Finger Print Sensor (R307) -TTL UART : rhydoLABZ INDIA
GitHub - NegasonicX/r307-Fingerprint-Sensor-on-ESP32: The Following Code is a Library for interfacing r307 Fingerprint Module with ESP32 on Embedded C Language
Interfacing R307 Optical Fingerprint Scanner with Arduino Boards for Biometric Authentication - CIRCUITSTATE Electronics
Finger Print Sensor R307 (New R305) [5531] : Sunrom Electronics