So you would like to use a Raspberry Pi Pico for biometric applications? This Fingerprint HAT for Raspberry Pi Pico has you covered. It comes with an A-172-MRQ fingerprint sensor, a 1.14-inch TFT display, a 5-way joystick and a programmable button. It has a Nuvoton MCU microcontroller as its brain. You can stack it on top of the GPIO header of your Pico.
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The 176x176p sensor has 508 DPI spatial resolution. It has a 8.8mm x 8.8mm active sensor area. You can use this to build secure locks that are opened with your unique fingerprint.
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