How does the biometric fingerprint scanner work?

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A Biometric finger print scanner consists of mainly 4 parts.
  1. A DSP IC.
  2. Microcontroller.
  3. Fingerprint scanner module.
  4. LCD.

DSP stands for Digital Signal Processing. It is an IC which process or analyze the digital signals with a very accurate and efficient way.

Microcontroller behaves as the controlling unit of the whole system. Normally ARM ICs are use for this purpose.

Fingerprint module to take the fingerprint of finger as an input.

And finally, LCD to display the relevant output or results.

When we put our finger in the module it takes the pictures of it. Then it convert the picture to a digital signal with the help of DSP IC. To say in a line, it forms a matrix in which the coordinates along with pixel and color dots are recorded. Then it send the digital data to Microcontroller to varify the match of the previously stored authorized person's fingerprint. If it gets matched then the person is moved to next level and if not then it does not permit the person to go to the next level. Accordingly LCD shows the corresponding results.

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