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Ultra-Slim Round Fingerprint Sensor and 6-pin Cable


  • Model: 4750
  • Shipping Weight: 0.05Kg
  • 6 Units in Stock
  • Manufactured by: Adafruit

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Description: Secure your project with biometrics - this adorably tiny, all-in-one, optical fingerprint sensor will make adding fingerprint detection and verification super simple. It's extremely slim, with a plastic casing that can be glued or panel mounted into any enclosure! There are some embedded blue LEDs that light up the outer casing when the sensor is waiting for finger touches.

These modules are typically used in safes - there's a high powered DSP chip that does the image rendering, calculation, feature-finding, and searching. Connect to any microcontroller or system with TTL serial, and send packets of data to take photos, detect prints, hash, and search. You can also enroll new fingers directly - up to 80 fingerprints can be stored in the onboard FLASH memory.

It also comes with a 6-pin Molex-style 1mm pitch connector, which you can easily cut off and solder directly to the wires.

But, of course, Adafruit wouldn't leave you a manual and a "good luck!" - they've written both an Arduino library and CircuitPython library so that you can get running in under 10 minutes. The library can enroll and search so it's perfect for any project. They've also written a detailed tutorial on wiring and use of these types fingerprint sensors.

Use this pin-out to connect to your microcontroller, and then use our library to interface over UART pins. Please note this sensor uses 115200 baud rather than the 'standard' 57600 used by many other sensors, so you'll need to update the examples to 115200 baud for the sensor to respond.


  • Black to GND
  • Yellow to Microcontroller TX (data out from microcontroller)
  • Green to Microcontroller RX (data in from microcontroller)
  • Red to 3.3V VIN
  • White to IRQ (can leave disconnected)
  • Blue to 3.3V VCC (can leave disconnected)



  • Sensor diameter: 20.8mm
  • Cable assembly length: ~100mm

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