This is the HC-SR04 ultrasonic
distance sensor. This economical sensor provides 2cm to 400cm of non-contact
measurement functionality with a ranging accuracy that can reach up to 3mm.
Each HC-SR04 module includes an ultrasonic transmitter, a receiver and a
control circuit.
There are only four pins that you
need to worry about on the HC-SR04: VCC (Power), Trig (Trigger), Echo
(Receive), and GND (Ground). You will find this sensor very easy to set up and
use for your next range-finding project!
This sensor has additional control
circuitry that can prevent inconsistent "bouncy" data depending on the
application.
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