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LDR 5 mm Photo Resistor
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Finger Print Sensor Module R307
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R307 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.
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(1) Using IO trigger for at least 10us high level signal,
(2) The Module automatically sends eight 40 kHz and detect whether there is a
pulse signal back.
(3) IF the signal back, through high level , time of high output IO duration is
the time from sending ultrasonic to returning.
Test distance = (high level time×velocity of sound (340M/S) / 2
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