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height-tracker-d136bb-en.md

Precision Height Measurement Overview

The Arduino Height Tracker is a smart digital stadiometer designed for quick and non-contact height measurement. By utilizing ultrasonic sonar technology, the system can measure the distance from a fixed ceiling or overhead mount to the top of a person's head, then calculate their exact height. It provides an alphanumeric readout on a crisp LCD screen, making it a professional-grade health monitoring tool for homes or clinics.

Hardware Core & Detection Tier

  • Arduino UNO: Functions as the primary processor, handling the precise microsecond timing required for sound-based distance calculations.
  • HC-SR04 Ultrasonic Sensor: The "measuring tape" of the project. It sends out a high-frequency sound pulse and listens for the echo.
  • I2C LCD 16x2 Display: Shows the live height readings in centimeters (or inches). Using an I2C module simplifies the wiring to just four wires total.
  • Mounting Structure (Not Included): To work correctly, the sensor must be mounted at a fixed, known height (e.g., 200cm above the ground).

Calculation Logic and Workflow

The system's operation is based on the speed of sound and basic subtraction:

  1. The Pulse: The Arduino triggers the ultrasonic sensor to send an 8-cycle ultrasonic burst.
  2. The Echo Timing: The Arduino waits for the signal to bounce off the person's head and return. It records the total travel time in microseconds.
  3. The Distance Calculation: Using the formula Distance = (Time / 2) * Speed of Sound (where speed is approx 0.034 cm/us), the Arduino determines the distance from the sensor to the head.
  4. The Height Result: If the sensor is mounted at exactly 200cm, the Arduino calculates: User Height = 200cm - Calculated Distance.
  5. Output Delivery: The final height is formatted and displayed instantly on the LCD.

Why Digital Measurement Matters

This project is an excellent example of Sensor Interpretation and Practical Math in programming. It replaces manual, error-prone measurement methods with consistent, electronic precision. Once mastered, the system can be expanded to include data logging (saving the user's height over time to an SD card) or even vocal feedback using a text-to-speech module, creating a fully accessible "Talking Height Station."

ข้อมูล Frontmatter ดั้งเดิม 

title: "Height Tracker"
description: "Height measurement project using ultrasonic sensor"
author: "sagar_s_01"
category: "Sensors & Environment"
tags:
  - "measurement"
  - "monitoring"
  - "height"
views: 1245
likes: 4
price: 1499
difficulty: "Intermediate"
components:
  - "1x Arduino UNO"
  - "1x Ultrasonic Sensor - HC-SR04"
  - "1x I2C LCD 16x2 Display"
  - "1x Jumper wires (generic)"
  - "1x Breadboard (generic)"
tools: []
apps:
  - "1x Arduino IDE"
downloadableFiles:
  - "https://projects.arduinocontent.cc/3a5344bd-2af4-4715-93c6-143a93de2f33.ino"
documentationLinks: []
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seoDescription: "Build a Height Tracker using Arduino and ultrasonic sensors. A step-by-step DIY height measurement project."
videoLinks: []
heroImage: "https://cdn.jsdelivr.net/gh/bigboxthailand/arduino-assets@main/images/projects/height-tracker-d136bb_cover.jpg"
lang: "en"