Information about PCB assembly options:
https://www.nextpcb.com/pcb-assembly-services?codeHtoeletric

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In previous videos I discussed optical fingerprint sensors such as R305 and R307. I recently created a tutorial using the GT511C3 optical fingerprint sensor. But capacitive fingerprint sensors are much better and more advanced. Actually, there are 3 different types of fingerprint sensors available in the market. They are optical, capacitive and ultrasonic. They all work with a different algorithm and a different image recognition system.

Anyway, our focus today will only be on the R502/R503 capacitive fingerprint sensor. We will learn in detail how capacitive fingerprint detection technology works. Next, we will learn about the construction design and pinout of the R502 fingerprint sensor. Next, we will connect the R502/R503 capacitive fingerprint scanner to Arduino. Then we take the Adafruit Fingerprint Sensor library, register the fingerprint and later read the stored fingerprints stored in the database.

https://how2electronics.com/interfacing-r502-r503-capacitive-fingerprint-sensor-with-arduino/

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