Smart Laser Distance Meter

---

Team

• E/21/065, CHAMOD S.A.R., email
• E/21/068, CHANDRASIRI E.M.D.D.V, email
• E/21/277, PADUKKA V.K., email
• E/21/325, RASHMIKA W.B.R., email

Table of Contents

1. Introduction
2. Solution Architecture
3. Hardware & Software Designs

4. Links

Introduction

Accurate indoor measurement and floor plan creation are essential in construction, interior design, and architectural planning. Traditional manual measuring methods are time-consuming, error-prone, and require manual sketching.

This project proposes a Smart Laser Distance Meter that integrates LiDAR-based distance sensing and inertial measurement to provide precise linear measurements, angle detection, and automatic area and volume calculations. The system further enables real-time 2D wall and floor plan generation, eliminating manual sketches and improving efficiency and accuracy.

Solution Architecture

The system consists of a handheld embedded device and a mobile application. The embedded unit performs distance and orientation sensing, processes data using a microcontroller, and transmits results wirelessly to the mobile app.

High-level flow:

• LiDAR sensor measures distance
• IMU provides orientation and angle data
• ESP32 processes and filters data
• Bluetooth transfers data to mobile app
• Mobile app generates sketches and calculations

Hardware and Software Designs

Hardware Design

• ESP32 CP2102 Type-C development board
• LiDAR DToF range finder (up to 20 m)
• MPU6050 IMU (3-axis accelerometer & gyroscope)
• 0.96" OLED display (I2C)
• Red line laser modules for alignment
• Buzzer and vibration motor for feedback
• 18650 battery with TP4056 charging module
• Custom PCB and 3D-printed enclosure

Software Design

• Sensor interfacing and calibration
• Distance and angle computation
• Bluetooth communication protocol
• Mobile application for visualization, storage, and export

Links

• Project Repository
• Project Page
• Department of Computer Engineering
• University of Peradeniya