Multi-Touch Interface on the Cheap(really Cheap)





Introduction: Multi-Touch Interface on the Cheap(really Cheap)

This is my first Instructable so please be nice. This is how to make a multi-touch interface out of you desk for very little money. Finally got a video uploaded,sorry about the bad frame-rate my laptop isnt all that good.

Step 1: Necesary Objects

For this you will need a Webcam, a Glass Desk, software called roboRealm ( RoboRealm download ). For me i mounted my webcam under my desk with ducktape.

Step 2: The Software and Setup

For this step we will be setting up the software to read and interpret the image. You can download this software from there website iI have not perfected the software for using fingers,kinda hard to seperate them,but..., I do have a pen like thing that I built from random things lying around my room that powers up an LED. The file Pen.robo is for using the LED pen thingy,u can use anything that powers up an LED and for added precision you can put an IR filter over the camera that is made from either a floppy disk drive or a completely dark spot from a negative on camera filem strip, And the file Touch.robo is for using hands but is not perfected.

Step 3: The LED Pen Device

The following pictures(sorry about the quality) are my newest version of the LED pen device, in the picture i have about 6-7 LED's attached but you only need 1 or 2 for extra precision

Materials needed are
3 volt small clock/watch battery x 1
Zip tie x 2
Electrical Tape
Switch with 2 wires coming out of it
LED's x 1/2 (your choice)
Penny x1

Steps for it are:
1) take the + side and face it down
2) put a wire to the switch on the - side
3) wrap zip tie tightly around battery so wire is held firmly, cut off excess zip tie
4) put tape on battery and zip tie
5) place penney on tape making shure it does NOT touch the battery
6 place second wire to switch on penny
7) tightly tie second zip tie in opposite direction than first one and cut off excess
8) place squares of tape on top/bottom
9) insert LED(s) by taking the long end and bending it up a little and then further down bending it down so the two wires a further apart but still even and parallel with each other

and make shure the - side touches the penny and the + touches the + side of the battery and when you flip the switch it should turn on, this is a very easy/compact way of doing an LED pointer for this project



  • Remote Control Contest 2017

    Remote Control Contest 2017
  • Arduino Contest 2017

    Arduino Contest 2017
  • LED Contest 2017

    LED Contest 2017

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Questions & Answers


How exactly do you download the files? all i do is click them and it takes me to a blank site thingy and it shows ""

please dont use my e-mail for anything bad think you and this link works

also teh text in it is 205 0 320 0 TRUE 4 100 1 2 Current Source TRUE -90 0.00 -60 2 TRUE 2 TRUE -1 FALSE TRUE 9 TRUE -1 gui newX 1400 1050 newY...what do i do with this?

Just save that file as a .txt and then after it is done downlaoding hange the extension to .robo

very very nice project 4 stars because i had to figure it out a lil by myself idea for a sweet add on: 4 point calibration :)

The touch one won't register my hand at all. Instead the thing locks onto the backround AND spazzes out I tried putting the thing so it is facing away from the light and my hands would be reflecting the light (night) and it still spazzes out, locked onto a black backround. What is the cause of this? BTW no laser pointer or LED or anything that I could rly use >_>

The camera with IR filter seems to work better because it only picks up light that is escaping from the IR lens.

i dont get how to use the script

the software doesn´t show me anything. only a grey screen. Why is that? and also I can get any signal or movement. please help!!!