Inside [Klaus]’ device is an Arduino Uno ... isn’t the limit of the sensor, though, and the device can be easily reconfigured to sense a distance up to four meters. The board doesn’t ...

This post is a review of the popular waterproof ultrasonic sensor JSN ... with a pretty long (~2.5 meters) weatherproof cable. According to many blogposts, the JSN-SR0T4 ultrasonic range finder can ...