Peel from the case to the element. Follow the readout through this conceptual model.
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Drag to rotate; pinch to zoom. With the view focused: arrow keys rotate, + / − zoom, 1–3 choose a layer, Home resets rotation and zoom. Step advances to the next layer; Reset returns to the case and default view. Layer buttons select a view directly. The page does not move on its own.
The paired transducers send a sound pulse and receive its returning echo. [Ultrasonic Distance Sensor (HC-SR04)]
Teaching view: Two silver cans sit side by side on the board. One sends sound toward a target; the other receives the echo.
The paired transducers send a sound pulse and receive its returning echo. [Ultrasonic Distance Sensor (HC-SR04)]
Teaching view: Two silver cans sit side by side on the board. One sends sound toward a target; the other receives the echo.
The microcontroller measures the echo pulse duration and converts it into distance. [Ultrasonic Distance Sensor (HC-SR04)]
Teaching view: The blue board supports two gold discs and a dark controller block. Trigger and echo connections let the microcontroller start a measurement and time the return.
For example, at a sound speed of 343 meters per second, a 2-millisecond round trip gives a target distance of 343 meters per second × 0.002 seconds ÷ 2 = 0.343 meters. [Ultrasonic Distance Sensor (HC-SR04)]
Temperature changes the speed of sound and therefore the distance calculation. [Ultrasonic Distance Sensor (HC-SR04)]
Teaching view: Each can contains a thin piezoelectric element that changes shape when a voltage is applied. The transmitter circuit drives its element back and forth to send a sound pulse. The returning echo vibrates the receiver element, producing a small voltage. The board detects the echo, and the microcontroller uses its travel time to calculate distance.
Explode separates the conceptual layers; X-ray makes the case translucent. External package dimensions follow the model specification; internal teaching geometry is conceptual, not to scale, and is not manufacturer CAD or a wiring diagram.