R307S Optical Fingerprint Identification Module Sensor - 1000 Fingerprints - UART & USB 2.0 Interface

Specifications

• Sensor Type: Optical Biometric

• Capacity: 1000 Fingerprints

• Interface: UART (TTL) & USB 2.0

• Baud Rate: 9600 to 115200 (Default: 57600bps)

• Verification Speed: < 0.3 seconds

• Matching Mode: 1:1 and 1:N

• Resolution: 500 dpi

• Supply Voltage: 4.2V - 6.0V DC

• Working Current: < 100mA (Peak)

• Scanning Area: 14mm x 18mm

• Cable Length: 15cm (Included)

Key Applications & Projects

• High-Capacity Attendance Systems: Perfect for schools or small offices needing up to 1000 user profiles.

• Biometric Door Locks: Build a secure, keyless entry for your home or workshop.

• Vehicle Ignition Safety: Ensure only authorised drivers can start heavy machinery or motorbikes.

• PC Login Peripheral: Use the USB 2.0 interface to create a custom Windows Hello-style login device.

Project Evolution

• Past Projects (Prerequisites): If you've mastered basic password-entry systems using keypads, the R307S is your entry into high-end biometrics.

• Feature Upgrade: This sensor unlocks "Identity Management." Instead of just "Access Granted," your project can now say "Welcome, [User Name]," thanks to the 1000 unique ID slots.

• Effort/Requirements: Intermediate. Wiring is simple, but managing a database of 1000 users requires structured coding habits and proper use of the Adafruit Fingerprint Library.

Virtual Technician & Wiring

• Red: VCC (5V)

• Black: GND

• Yellow: TX (Connect to Microcontroller RX)

• White: RX (Connect to Microcontroller TX)

• Green: Touch Induction (Optional wake-up pin)

• Blue: 3.3V Output (Reference only)

Accessories

• Included: 1x R307S Optical Fingerprint Module, 1x 6-Pin 1.27mm to 2.54mm Connector Cable (15cm).

• Required Additional Items: Arduino/ESP32 or USB-to-TTL Converter for PC testing.

Frequently Asked Questions (FAQ)

• What is the difference between R307 and R307S? The 'S' version features a more compact design and an upgraded DSP for faster matching.
• Does it work with the Adafruit Fingerprint Library? Yes, it is fully compatible.
• Can I use it with a 3.3V microcontroller like ESP32? Yes, but ensure the VCC is 5V. The logic pins are usually 3.3V tolerant.
• How do I use the USB interface? You can solder a USB cable to the D+ and D- pads on the PCB.
• What happens if I forget the sensor password? The default password is 0xFFFFFFFF, but if changed and lost, the module may become locked.
• Does it store actual images? No, it stores encrypted biometric templates.
• Is it waterproof? No, it should be mounted behind a protective casing for outdoor use.
• Can it detect fake/silicone fingers? It has basic anti-spoofing, but it is primarily an optical-intensity sensor.
• What is the default I2C address? This is a UART/USB sensor, it does not use I2C.
• How many fingerprints can it hold? Exactly 1000 templates.
• Does the 15cm cable come pre-crimped? Yes, it includes a 6-pin connector.
• Can children use this? Yes, but their fingerprints change as they grow, requiring re-enrollment.
• Is there a PC demo software? Yes, various "Fingerprint Test" utilities work with this module via USB.
• What is the FAR (False Acceptance Rate)? Less than 0.001%.
• Does the sensor face light up? Yes, it has an integrated red/blue backlight for status indication.
• How fast is the matching? 1:N matching for 1000 prints takes less than 0.3 seconds.
• Can I download the database to my PC? Yes, templates can be read and written via UART commands.
• What is the peak current? About 100mA during a scan.
• Can I use it for a Windows Login? Yes, via the USB interface and appropriate drivers.
• Is the sensor surface scratch-resistant? It is made of hardened glass, but avoid sharp metal contact.