AS608 Fingerprint Sensor 3.3V

🔹 AS608 Fingerprint Sensor Module – Optical Fingerprint Reader, 3.3V Logic

The AS608 is a high-performance optical fingerprint sensor module that captures, stores, and matches fingerprints. It features a built-in DSP and flash memory, operating at 3.3V logic level, making it ideal for security systems, access control, attendance systems, and biometric authentication projects with 3.3V microcontrollers like ESP32, STM32, and Raspberry Pi.

✅ Specifications:

• Sensor Type: Optical (CMOS image sensor)

• Chipset: AS608 (Fingerprint recognition)

• Interface: UART (TTL) – Serial communication

• Operating Voltage (VCC): 3.3V DC (Do not use 5V)

• Operating Current: <60mA (typical)

• Peak Current: ~120mA (during image capture)

• Logic Level: 3.3V (TTL)

• Baud Rate: 9600, 19200, 28800, 38400, 57600, 115200 (default: 57600)

• Storage Capacity: Up to 162 fingerprints

• Image Resolution: 500 DPI

• Image Capture Time: <0.5 seconds

• Matching Time: <1 second (1:N search)

• False Acceptance Rate (FAR): <0.001%

• False Rejection Rate (FRR): <1%

• Connector: 6-pin (JST ZH – 1.5mm pitch)

• Dimensions: ~56mm x 21mm x 21mm

• Operating Temperature: -20°C to +60°C

📦 Pinout:

PinNameFunction1VCC3.3V DC power only2TXTransmit (3.3V logic)3RXReceive (3.3V logic)4GNDGround5WAKWake-up / Touch detection (3.3V logic)63.3V3.3V output (for external use, limited current)

📦 Features:
✔️ Optical sensor – works with most finger types
✔️ Built-in DSP – processes images internally
✔️ Onboard flash – stores fingerprint templates
✔️ UART interface – easy to use with any microcontroller
✔️ 3.3V logic and power – compatible with ESP32, STM32, Raspberry Pi
✔️ Low power consumption
✔️ Includes wake-up pin for power management

📦 Applications:
✔️ Access control and door lock systems
✔️ Biometric attendance systems
✔️ Security and authentication devices
✔️ Smart home and IoT security
✔️ ESP32 / STM32 / Raspberry Pi projects
✔️ DIY electronics and security projects

🔧 Wiring to ESP32 (3.3V):

AS608 PinESP32 PinVCC (3.3V)3.3VTXRX2 (GPIO16)RXTX2 (GPIO17)GNDGNDWAK (optional)Any GPIO

⚠️ Important Notes:

• VCC is 3.3V only. Do not connect to 5V – this will damage the sensor.

• For 5V microcontrollers (Arduino Uno), use a level shifter on both VCC, TX, and RX lines, or use a separate 3.3V power supply and level shifters for data lines.

• Library required: Use the Adafruit Fingerprint Sensor Library.

• Storage capacity: Up to 162 fingerprints.