Most often ultrasonic transducers are used for distance measurements, and in the DIY world, usually as a way for robots ... The transmitter and receiver For the transmitter, he turned an Arduino ...

[Reza’s] methodical investigation of this remote controlled outlet let him patch in with an Arduino using a 433 MHz transmitter. This is a single-device unit, but the techniques used here should ...

"The transmitter sends sound waves and the receiver detects them bouncing off obstacles, calculating their distance, size and speed. This data is sent to an Arduino Nano, the system's brain ...