Sonar is a great sensor to add to any small-scale robot project. And for a couple bucks, the ubiquitous HC-SR04 modules make it easy to do. If you’ve ever used these simple sonar units, ...
More recently, he’s been researching sonar sensing and experimenting with the relatively inexpensive HC-SR04 module ... him to the idea of submerging the sensor in mineral water oil to both ...
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