Finger-Vein-Scanner-Module-B User Guide

Overview

Introduction

This is a finger vein recognition module based on a 32-bit ARM Cortex-M4F processor, with a clock speed of up to 192MHz, supporting floating-point operations and DSP instruction sets, and can efficiently run biometric algorithms. The module adopts a lamp and board separation structural design, facilitating embedding into various terminal devices and enhancing the overall integration level. The module interface is compatible with the industry-standard protocol of fingerprint recognition, has good platform adaptability and scalability, and supports rapid development and deployment. It is widely used in smart security devices such as smart door locks, push-pull or hidden handles, small smart lockers, and access control and attendance systems, helping to achieve high-precision and high-reliability identity authentication solutions.

Specifications

SOC	192MHZ 32-bit ARM Cortex-M4F microprocessor
User capacity	100 ID
Recognition speed	< 1s
Matching method	1:1 or 1:N
Vein template data	Single template ≤ 1K bytes
False Acceptance Rate (FAR)	< 0.0001% (at high security level)
False Rejection Rate (FRR)	0.01% (at higher security level)
Communication interface	USB: Adaptive USB drive-free (Windows)
Communication interface	UART: 3.3V TTL, default baud rate: 57600bps
Operating voltage	3.3V (±3%)
Operating current	19.5mA
Standby current	≤ 5uA
Dimensions	39.98 × 34.92 × 8.29 (mm)
Enclosure	ABS + PC
Fire rating	UL94-5VB
Waterproof rating	IP56 (except for the port, lamp and board parts)

Onboard Interfaces

This module provides both TTL (UART) and USB pins. When users use it, they can choose different cables for connection according to their own usage.

Terminal 1: UART port (MX1.25 6PIN)
Terminal 2: Lamp board communication port, provides lamp board power supply and USB interface communication (MX1.25 5PIN)
Terminal 3: Lamp board communication port, obtains lamp board power supply and USB interface communication (MX1.25 5PIN)
Terminal 4: USB communication port (MX1.25 4PIN)

No.	Name	Function	Specification
01	TCH-3.3V	External normal 3.3V power input positive	Used in low power mode
02	WAKE-ON	Touch signal wake-up output	Active at high level
03	VCC-3.3V	External 3.3V power input positive	±3%
04	TTL-RXD	Asynchronous TTL serial port receive	3.3V level
05	TTL-TXD	Asynchronous TTL serial port transmit	3.3V level
06	VCC-GND	External 3.3V main power input negative	Used in low power mode

Hardware description

Connection Description

For two types of communication interfaces, we provide various cables to facilitate users in adjusting according to the products they are using.

Finger vein module + lamp and board
3.3V adapter board
MX1.25 6PIN double-ended cable
MX1.25 6PIN double-row cable
MX1.25 5PIN double-headed cable
USB cable

UART Connection

If you need to use the UART serial port to communicate, you can use the MX1.25 9PIN cable to connect the module to the motherboard, and connect the following pins through the corresponding pin definition table above, here take the Raspberry Pi motherboard as an example:

Pin No.	Finger-Vein-Scanner	Motherboard (Raspberry Pi)
03	VCC-3.3V	3.3V power pin
04	TTL-RXD	UART_TXD
05	TTL-TXD	UART_RXD
06	VCC-GND	GND

Note: If the user customizes the motherboard interface, the provided MX1.25 6PIN dual header cable can also be directly connected.

USB Connection

If a user needs to use a USB interface for communication, they can connect using the provided 3.3V adapter board and USB cable. Here, the connection is made to the computer host.

Connect the MX1.25 4PIN (9-to-4) cable to the module, connect the other side to the 3.3V adapter board, and then use the USB cable to connect it to the computer.

Note: The power supply voltage of the module is 3.3V, if the user connect through other cables, please note that 3.3V power supply should be used, otherwise the device cannot be used normally.

Finger Placement Description for Finger Vein Module

Correct placements

Wrong placements

Software Description

Host Device Doftware

For the finger vein module, we provide a host device software for users to test and use conveniently. Users can download the test software from the Resources section, which supports the Windows system.

Connect the device to the computer via USB according to the hardware connection instructions
Open the test software
Under normal circumstances, the device will automatically be recognized after being connected
1. In the absence of interference from other devices, the port number defaults to USB1
2. The device number defaults to 0
3. The baud rate remains at the default 115200
4. Click to connect device
5. Click "Get empty ID" and the software will automatically fill in the available ID number
6. Click "Vein registration" and place your fingers three times according to the voice and message prompts
7. After the vein registration is successful, click "1:N Verification" to do a matching test on the fingers
8. After testing, clicking "Close Device" can disconnect the communication with the device

Note: More software features to be updated