What components do you need to build a basic ultrasonic distance meter circuit?
To build a basic ultrasonic distance meter circuit, use an ultrasonic transducer module (consisting of a transmitter and receiver), a microcontroller to process the echo signal, and a display (like an LCD) to show the distance. The microcontroller calculates the distance by measuring the time between sending a signal and receiving its echo. Include power supply components and necessary interface elements.