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height-tracker-ultrasonic-en.md

Digital Measurement: The Height Tracker

Tired of drawing marks on a doorframe? The Height Tracker uses supersonic sound to measure human height instantly. It’s a fun, interactive project often used in science fairs and interactive exhibits.

lcd_distance_sensor_sr04_view_1772706727668.png

The Reversal Logic

Standard distance meters measure how far away an object is. The height tracker flips this logic:

  1. The Setup: The HC-SR04 sensor is mounted securely on a wall at an exact known height (e.g., exactly 200 cm from the floor), pointing straight down.
  2. The Measurement: A person stands under it. The sensor measures the distance from the ceiling to the top of the person's head (e.g., 30 cm).
  3. The Math: The Arduino subtracts the measured distance from the total known height (Height = 200cm - 30cm = 170cm).

Hardware Requirements

  • Arduino Uno/Nano: The calculator.
  • HC-SR04 Ultrasonic Sensor: The sound transceiver.
  • 16x2 LCD or 4-Digit 7-Segment Display: To show the final height.
  • Push Button: To trigger the measurement when the person is ready.

Calibration for Accuracy

Because sound travels at different speeds depending on the air temperature, you can add a DHT11 sensor to your project. The Arduino can then adjust the speed of sound variable in its formula based on the current room temperature, ensuring medical-grade accuracy!

ข้อมูล Frontmatter ดั้งเดิม 

title: "Height Tracker with Ultrasonic Sensor"
description: "Measure yourself! Build an electronic stadiometer (height measurer) that calculates a person's height accurately by bouncing sound waves off their head."
category: "Health & Wellbeing"
difficulty: "Easy"