상황
Designing an Arduino-based system that measures vehicle speed on highways using two ultrasonic sensors spaced a known distance apart.
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01
Use two HC-SR04 ultrasonic sensors to capture entry/exit timestamps
02
Power the Arduino and sensors from a regulated 5V rail with decoupling capacitor
03
Connect sensor trigger and echo lines to spare GPIO pins (D4-D7)
When building a speed detection prototype or educational demonstration of time-of-flight speed measurement.