How to Build a Multi-Touch Application Using RPLIDAR

This guide explains how to build a multi-touch application based on an RPLIDAR. The document focuses on actual operation steps, so you can follow the process directly and reproduce the demo successfully.

1.Download the Required Files

YouTube video tutorials：https://www.youtube.com/watch?v=3OKOf2sBwus

Frame grabber download link:SLAMTEC School_Sensing Sensor Category

Download the attachment package:

Download link: https://drive.google.com/file/d/1PqJRVVK07jiFPQ33L0dHFBsvFC4-2nxB/view?usp=drive_link

The package includes:

Demo project files
Multi-touch SDK
Calibration tool
Server and client demo programs

2.Important Notes Before You Start

Please read these notes carefully before following the steps.

This document does NOT support the RPLIDAR A1 series
The SDK currently supports Visual Studio 2010 only
The demo is based on a Windows environment
The compressed package already contains compiled files

If you modify the SDK later, you will need to rebuild the project again.

3.Open the Project

Open the following directory inside the downloaded package:

demo_TUIO\multitouch_server\multitouch_Server\workspaces\vc10

Then open the file:

multi_touch_server.sln

4.Rebuild the Solution

After opening the project in Visual Studio 2010:

1.Click Build → Rebuild Solution

2.Wait until the compilation is completed

After rebuilding, go to the following directory:

...\sdk_project\multiTouch_sdk\Debug\output

Copy this file:

multiTouch_sdk.dll

Then paste it into the following two folders:

...\vc10\calibration_project\bin

...\vc10\server_project\bin

Note

The compressed package already contains the compiled DLL and it has already been copied to the correct directories.

You only need to repeat the steps above if you modify the multiTouch SDK.

5.Connect the RPLIDAR and Start the Calibration Tool

After connecting the RPLIDAR sensor to your computer, run the calibration program located at:

...\vc10\calibration_project\bin\calibration_app.exe

Once the program starts:

The LiDAR will begin rotating

You will see scanning points displayed in the calibration window

6.Load the Configuration File

In the calibration program:

1.Click Load Configuration in the top-left corner

2.Select the configuration file:

...\vc10\server_project\multi_touch.json

This configuration file includes:

Client IP address
Port settings
Touch area size

You may adjust the Touch Area if necessary. It is recommended not to modify other parameters unless required.

7.Adjust the Touch Area

After loading the configuration:

The LiDAR will start scanning
Laser points will appear in the calibration window
A white dashed rectangle will be visible

You can drag the white rectangle to adjust:

Touch area size
Touch area position

After finishing the adjustment:

1.Click Save Configuration

2.Close the calibration application

8.Start the Client Program

Open the following directory:

client_4444

Run:

TuioDemo.exe

The client program includes:

A console window
A graphical interface

After the server starts, the console will continuously display:

addBlob

removeBlob

The GUI window will also show the detected touch points (blobs).

The image shows that client_4444, which is the client with port 4444 in the configuration file, has been started.

9.Start the Server

Now start the server program.

Open the following directory:

...\vc10\server_project\bin

Run:

MultiTouch_Server.exe

10.Verify That the System Is Working

If everything is working correctly:

The client console will continuously print:
- addBlob
- removeBlob
The client GUI window will display touch points in real time

The example shown in the document uses the client_4444 folder, which corresponds to port 4444 in the configuration file.

You can also view the demo_TUIO.MOV file in the compressed package to see the running effect.

11.When Do You Need to Rebuild the Project?

You only need to rebuild the project if:

You modify the multiTouch SDK
You change the SDK source files
The DLL file is missing

Otherwise, you can directly run the calibration tool, client, and server from the package.

Summary

By following the steps above, you can:

Connect an RPLIDAR
Calibrate the touch area
Start the client and server
Detect multi-touch points in real time

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