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HANDS-ON STEAM PROJECT

Ultrasonic Distance Meter

Grade: 6–8Difficulty: Beginner

Measure approximate distances with an HC-SR04 sensor.

Instructions and Learning Resources

How it works

Ultrasonic pulses reflect from an object. The delay approximates distance when the signal path and environment are suitable.

Steps

  1. Connect the module at its specified voltage.
  2. Write a short trigger-pulse routine.
  3. Measure echo duration.
  4. Compare results with a ruler.

Level shift 5 V outputs before using 3.3 V GPIOs.