Watch video Raspberry Pi LESSON 21: Using a HC-SR04 Ultrasonic Sensor For Echolocation online without registration, duration 40 minute 18 second in high hd quality. This video was added by user Paul McWhorter 28 July 2022, don't forget to share it with your friends and acquaintances, it has been viewed on our site 9 thousand once and liked it 303 people.