Fingerprint Optical Scanner Reader Sensor Module R307

Out Of Stock



The R307 is an optical fingerprint scanner module from the R30X series, offering image rendering, calculation, feature finding, and searching functionalities. Designed for ease of integration, it provides TTL serial output, enabling seamless connection to various microcontrollers or systems. This versatile module finds applications in access control, attendance systems, safety deposit boxes, car door locks, and more. Its advanced image processing capabilities allow successful image capture with a resolution of up to 500 dpi.



  • Overall Size: Approx. 45 x 24 x 20mm
  • Backlight: Blue
  • Interface: USB2.0/UART (TTL logical level)
  • RS232 Communication Baud Rate: 9600BPS~115200BPS (changeable)
  • Verification Speed: 0.1 sec
  • Scanning Speed: 0.2 sec
  • Character File Size: 256 bytes
  • Template Size: 512 bytes
  • Storage Capacity: 1000
  • Security Level: 5 (1,2,3,4,5 - highest)
  • FRR (False Rejection Ratio): ≤1%
  • FAR (False Acceptance Ratio): ≤0.0001%
  • Resolution: 500 DPI
  • Voltage: DC 4.2-6V
  • Working Current: 50mA (Typical)
  • Peak Current: 75mA
  • Matching Method: 1: N
  • Operating Temperature: -20-50 ℃
  • Image Capture Surface: 1.5 x 1.1mm


Pins Definition:

Pin Number Name Type Description
1 5V in Input (DC4.2V - 6V)
2 GND - Signal ground. Connected to power ground
3 TXD out Data output TTL logical level
4 RXD in Data input TTL logical level
5 Touch out Finger detection signal (max output current: 50mA)
6 3.3V in Finger detection power (DC3.3V-5V, about 5uA)


Hardware Connection:

  • Via the serial interface, the module may communicate with an MCU of 3.3V or 5V power.
  • TXD (pin 3 of P1) connects with RXD (receiving pin of MCU).
  • RXD (pin 4 of P1) connects with TXD (transferring pin of MCU).
  • For RS-232 mode on the PC, a level-converting circuit like MAX232 is required between the module and PC.


How It Works:

  • Fingerprint processing involves two parts: enrollment and matching (1:1 or 1:N).
  • During enrollment, the user enters the finger twice, and the system generates a template stored in the library.
  • During matching, the user enters the finger, and the system compares it with templates in the library.
  • The system returns success or failure based on the matching result.


For More Information:


Package Includes:

  • 1 x R307 optical fingerprint scanner module
  • 1 x Cable