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R307S sensor is fingerprint detection and verification super simple to implement with Arduino,and other microcontrollers.This is the updated latest model of the R305 FingerPrint Sensor.
Ultrasonic Sonar Sensor HC-SR04 uses to determine the distance to an object.This sensor reads from 2cm to 400cm with an accuracy of 0.3cm,which is good for most hobbyist projects.