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He wanted to use the less expensive HC-SR04 ultrasonic rangefinder ... [Clint] was working with the Arduino library, based on the Parallax PING, which uses a single pin for trigger and echo.
He wanted to use the less expensive HC-SR04 ultrasonic rangefinder ... [Clint] was working with the Arduino library, based on the Parallax PING, which uses a single pin for trigger and echo.
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