Finger Print Sensor R307 -TTL UART



Finger Print Sensor R307 consists of an optical fingerprint sensor, high-speed DSP processor, high-performance fingerprint alignment algorithm, high-capacity FLASH chips and other hardware and software composition, stable performance, simple structure, with fingerprint entry, image processing, fingerprint matching, search and template storage and other functions.


The Finger Print Sensor R307 has two interface TTL UART and USB2.0, USB2.0 interface can be connected to the computer; RS232 interface is a TTL level, the default baud rate is 57600, can be changed, refer to a communication protocol; can And microcontrollers, such as ARM, DSP and other serial devices with a connection, 3.3V 5V microcontroller can be connected directly. Needs to connect the computer level conversion, level conversion note, embodiments such as a MAX232 circuit.


  • Independent fingerprint collection, fingerprint registration, fingerprint comparison (1: 1) and fingerprint search (1: N) function.
  • Low power consumption of the product
  • A strong anti-static ability, the anti-static index reached 15KV above.
  • Professional optical technology, precise module manufacturing techniques
  • Suitable for different applications, security levels can be set by the user to adjust.


  • Fingerprint sensor type: Optical
  • Sensor Life: 100 million times
  • Static indicators: 15KVBacklight: bright green
  • Interface: USB1.1/UART(TTL logical level)
  • RS232 communication baud rate: 4800BPS~115200BPS changeable
  • Dimension: 44.1*20*23.5mm
  • Verification Speed: 0.3 sec
  • Scanning Speed: 0.5 sec
  • Character file size: 256 bytes
  • Template size: 512 bytes
  • Storage capacity: 1000
  • Security level: 5 (1,2,3,4,5(highest))
  • False Acceptance Rate (FAR) :0.0001%
  • False Rejection Rate (FRR): 0.1%
  • Resolution 500 DPI
  • Working current: Typical 50 mA, Peak 80mA
  • Matching Method: 1: N


Pin Pin Name Details
1 5V Regulated 5V DC
2 GND Common Ground
3 TXD Data output – Connect to MCU RX
4 RXD Data Input – Connect to MCU TX
5 TOUCH Active Low output when there is a touch on the sensor by finger
6 3.3V Use this wire to give 3.3V to the sensor instead of 5V



Difference Between R305 (Old) and R307 (New)

R305 R307
Storage Capacity (Fingerprints) 250 1000
3.3V Operation No Yes
USB Operation No Yes
Finger Detect Output No Yes



Package Content:

1 x R307 fingerprint sensor Module

1 x wire connector

Note: We test the product before shipping.  We do not provide help related to programing. All details and protocol are given in download.
There is no warranty on the module. These can easily get damaged with wrong polarity or high voltage given to it. So be careful before power on. Internal LED does not come or stay on all the time, It only comes on when you give command to read fingerprint.

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