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Finger Print Module Serial UART TTL


The Output Pins:

  • RED  -> VCC
  • BLACK -> GND
  • YELLOW  -> RXD
  • GREEN -> TXD

Secure your project with biometrics – this all-in-one  optical fingerprint sensor will make adding fingerprint detection and  verification super simple. 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 162 finger prints can be stored in the onboard  FLASH memory. There’s a red LED in the lens that lights up during a  photo so you know its working.

There are basically two requirements for using the  optical fingerprint sensor. First is you’ll need to enroll fingerprints  – that means assigning ID #’s to each print so you can query them later.  Once you’ve enrolled all your prints, you can easily ‘search’ the  sensor, asking it to identify which ID (if any) is currently being  photographed.

You can enroll using the windows software (easiest and  neat because it shows you the photograph of the print) or with the  Arduino sketch (good for when you don’t have a windows machine handy or  for on-the-road enrolling) 

Enrolling new users with Windows:

The easiest way to enroll a new fingerprint is to use the  Windows software. The interface/test software is unfortunately  windows-only but you only need to use it once to enroll, to get the  fingerprint you want stored in the module.

First up, you’ll want to connect the sensor to the  computer via a USB-serial converter. The easiest way to do this is to  connect it directly to the USB/Serial converter in the Arduino. To do  this, you’ll need to upload a ‘blank sketch’ this one works well:

  • this sketch will allow you to bypass the Atmega chip and connect the fingerprint sensor directly to the  USB/Serial chip converter.
  • Red connects to +5V
  • Black connects to Ground
  • Yellow goes to Digital 0
  • Green goes to Digital 1

Wire up the sensor as described in the sketch  comments after uploading the sketch. Since the sensor wires are so thin  and short, we stripped the wire a bit and melted some solder on so it  made better contact but you may want to solder the wires to header or  similar if you’re not getting good conteact. When you plug in the power,  you should see the red LED blink to indicate the sensor is working.

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