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Object Measurement System

A smart device that automatically measures the length of objects placed on a platform. This project uses an FPGA development board to control motors and sensors, creating a low-cost measurement tool from recycled printer parts.

Demo:

Watch Demo

What is This Project?

The system works like a mini scanner:

  • You place an object on the measurement platform
  • A sensor moves across the object
  • The system calculates the object's length
  • The result appears on a display screen

Diagram

Key Achievement: Built a complete measurement system using recycled printer mechanics and an FPGA board, demonstrating skills in embedded systems, motor control, and sensor integration.

🔧 Parts Used

Here are the main components that make this project work:

1. Basys3 FPGA Board

  • The "brain" of the system
  • Controls everything and makes calculations
  • Processes sensor data and manages motor movement

2. Object Detection Sensor

  • Detects when an object is in front of it
  • Sends a signal (on/off) to the FPGA
  • Works like a light switch that turns on when it sees an object

3. Motor and Roller System

  • Moves the sensor back and forth
  • Taken from an old printer (recycling!)
  • Creates smooth, precise movement

4. LED Indicator Light

  • Turns on when an object is detected
  • Provides visual feedback
  • Shows the system is working

5. LED Display Screen

  • Shows the final measurement result
  • Displays the length in millimeters
  • Easy to read numbers

⚙️ How Does It Work?

The system follows a simple step-by-step process:

Step 1: Start Up 🚀

  • The system turns on and initializes all components
  • The motor starts moving the sensor from the left side

Step 2: Scanning 🔍

  • The motor moves the sensor slowly across the platform
  • The sensor continuously checks if an object is in front of it

Step 3: Detection 👁️

  • When the sensor first sees an object, it lights up the LED indicator
  • The system remembers this position (start of measurement)
  • The measurement begins!

Step 4: Measuring 📐

  • The motor keeps moving while the sensor sees the object
  • The system counts how far the motor has moved
  • This continues until the sensor no longer sees the object (end of measurement)

Step 5: Calculation 🧮

  • The system calculates: end position - start position = object length
  • Converts the motor movement into millimeters
  • Uses a calibration factor for accuracy

Step 6: Display 📊

  • The result appears on the LED display
  • Shows the length in millimeters (e.g., "45.2 mm")
  • The LED indicator turns off

Step 7: Reset 🔄

  • The motor returns to the starting position
  • The system is ready for the next measurement