M5Stack Unit Fingerprint 2 A‑K323CP

The M5Stack Unit Fingerprint 2 A-K323CP is a compact fingerprint recognition module designed for biometric security applications. The module integrates an STM32 core controller with an all-in-one fingerprint recognition module of type A-K323CP. The built-in semiconductor-based capacitive sensor enables functions such as capturing, feature extraction, registration, comparison, storage, and retrieval of fingerprints. Thanks to an integrated recognition algorithm library, the system can adapt to both dry and wet fingers, with matching and search functions being fast and precise. A UART interface ensures easy integration into various microcontroller platforms. For user guidance, the unit features a seven-color RGB LED ring and an operation LED that indicate the working status. The fingerprint management supports 100 entries and provides a data storage of 7262 bytes per entry. Typical applications include smart door locks, access and time attendance systems, authentication in vending machines, and small security solutions.

Features:

Integrated STM32 controller ensures high computing power and a compact design
High-resolution capacitive fingerprint sensor with 508 dpi provides accurate recognition
Storage for up to 100 fingerprints allows flexible user management
Adaptive processing for dry and wet fingers improves reliability
Management functions, precise matching, and search speed up identification
Built-in RGB LED ring with seven colors visibly displays operating status
Compatible with development environments such as UiFlow2, Arduino IDE, and PlatformIO

Application examples:

Smart door locks and secure front door access systems
Access control and attendance recording systems for offices or schools
Identity authentication in vending machines and self-service devices
Biometric payment terminals in banks or stores
Small security systems, such as for drawers or lockers

Download and Links:

Technical Specifications:

Manufacturer: M5Stack
Manufacturer SKU: U203
MCU: STM32G031G8U6
Fingerprint Module: A-K323CP
Fingerprint Resolution: 508 dpi
Sensor Pixel Resolution: 80 × 208 pixels
Image Capture Data: 8230 Bytes (4 Bit per pixel)
Fingerprint Storage Capacity: 100 entries
Data size per entry: 7262 Bytes per fingerprint
Interface: UART with 115200 bps @ 8N1
Power Consumption: Operating mode 40 mA (LED breathing) or 37.25 mA (LED off); Sleep mode 14.11 mA
Dimension: 24 × 62 × 8mm
Weight: 12g