● 17 min readShowdown: Uno R4 vs Uno R3 vs Nano
Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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| 10+ | ₹1,253.42 ₹ 1062.22 + 191.2 GST | |
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High-capacity optical biometric sensor with onboard 1000-print memory. Features high-speed DSP, dual UART/USB communication, and a 15cm connector cable for easy integration.
Ever felt the frustration of a security system that runs out of memory or fails to recognise a user after just a few weeks? Standard fingerprint modules often cap out at 100 or 200 users, and their matching algorithms can be sluggish. The R307S Optical Fingerprint Identification Module is designed to solve the scale problem. With a massive onboard capacity for up to 1000 fingerprints and a dual-interface DSP, it brings industrial-grade biometric security to your Arduino or PC-based projects.
What makes the R307S stand out is its pedigree. Unlike generic sensors sourced from liquidation lots, our stock is Probots™ Source-Trace ???? to ensure you receive genuine, high-grade silicon. Each batch is Probots™ Lab Verified ???? in our Bangalore facility to guarantee the UART baud rate is stable and the optical lens is free from defects. Furthermore, to ensure your precision optics arrive in perfect condition, we utilize Probots™ Secure-Transit ???? packaging, featuring shock-resistant layers to prevent physical damage or pin misalignment during shipping.
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)
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.
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.
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)
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.


Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We delivery electronics components and parts throughout India using standard couriers like Bluedart, Delhivery & India Post.
For order related queries contact -
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We offer specialized services for Bulk, Wholesale & B2B Customers like discounted prices, additional shipping options, customised products, etc . Customer with large quantity & regular orders qualify for the specialised discounted rates.
We also offer dedicated sales team to assist you with the order process by providing sales quotations, PI, technical support for choosing products, etc.
Note: Business Orders are processed manually and usually take 1-3 days to process compared to placing the order directly on our website. Please plan your purchases accordingly.
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Probots Electronics is highly regarded for its great selection of components and professional service. Customers frequently praise the awesome care and timely delivery provided by the team to ensure all products arrive safely.
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