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arduino-speed-detector-55410d-en.md

Velocity Check: The Arduino Speedometer

How fast is that toy car? The Arduino Speed Detector uses the basic physics formula Speed = Distance / Time to give you accurate real-time velocity readings.

ir_sensor_array_detail_1772704523332.png

The Measurement System

The setup involves two IR Speed Sensors placed at a known, fixed distance from each other (e.g., 10cm or 20cm).

  1. Start Timer: When the object passes the first sensor, the Arduino records the current time (in milliseconds).
  2. Stop Timer: When the object passes the second sensor, the Arduino calculates the elapsed time.
  3. Calculation: The code divides the distance by the recorded time difference to find the speed.
  4. Display: The final speed is displayed on a 16x2 LCD or via the Serial Monitor.

Components Needed

  • Arduino Uno/Nano: To handle the high-speed timing.
  • IR Obstacle/Speed Sensors (x2): The start and stop triggers.
  • 16x2 LCD Screen: For displaying the results (km/h or m/s).
  • Track or Enclosure: To keep sensors perfectly aligned.

Optimization: The Micros() Function

For very high speeds, the standard millis() function isn't precise enough. Makers use the micros() function, which provides a resolution of one-millionth of a second, allowing you to measure the speed of even the fastest small-scale models.

ข้อมูล Frontmatter ดั้งเดิม 

title: "Arduino Speed Detector"
description: "Measure speed with light! This project uses two infrared sensors to calculate the speed of a moving object as it passes through two points."
category: "Sensors & Environment"
difficulty: "Easy"