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Scoop.it!
Let's measure distances with an ultrasonic rangefinder (distance sensor) and Arduino's digital input. We'll connect up a circuit using a breadboard and use some simple Arduino code to control a single LED. You may have already learned to read a pushbutton and PIR motion sensor with Arduino's digital input, and we'll build on those skills in this lesson. 
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Scoop.it!
This post is about how to use the ultrasonic sensor HC-SR04 with Arduino Uno to make an ultrasonic distance sensor just like the ultrasonic sensor used in cars for parking assistance or Robotics.
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Scoop.it!
This project is about how to use the ultrasonic sensor HC-SR04 with Arduino Uno to make distance measurements just like in cars
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