What are inputs of a fingerprint reader?

The inputs of a fingerprint reader primarily include the physical fingerprint itself, which is captured through sensors that detect the unique patterns of ridges and valleys on the skin. These sensors can be optical, capacitive, or ultrasonic, each using different methods to scan and digitize the fingerprint. Additionally, the system may require user authentication inputs, such as a PIN or passWord, to confirm identity before processing the fingerprint data.