Sparkfun Inventor's Kit for Learning Arduino - Ultrasonic Distance Sensor (Circuit 3B with HC-SR04)

This circuit will introduce the HCSR04 Ultrasonic Sensor to our electronics toolkit. Unlike the Servo, the HCSR04 doesn't require a library to be included manually, nor does it use objects or methods. We will use a function to calculate the distance in this sketch such that our loop function isn't too long or complicated (it's also good practice to modulate any simple, repetitive tasks).

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