Desktop Scroll Wheel and Volume Control! by whatsisface
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Make Magazine's weekend project, 3/4/09

Some Background

Recently, I've been reading a lot of different blogs. Each day I'll read the latest posts on engadget, lifehacker, hackaday, BBG and the MAKE: blog. The problem for me came when I realised that only some of the posts were interesting to me, and to get to the interesting ones took a lot of scrolling.

For this, there are several solutions. I could have set my RSS reader up with each of the blogs that I read and go through the titles daily, or I could have set up a Yahoo! Pipe to filter by words in the title. I didn't much fancy this though, so I set about looking for easier ways to scroll long distances. In my searching, I came across this: http://www.griffintechnology.com/products/powermate - The Griffin PowerMate. The PowerMate is an assignable controller that you can set up for many things, browsing Google Earth, scrolling, Controlling volume etc..

I took a look at some YouTube videos of it in use and thought it was literally a scroll mouse on it's side with a fancy knob and some software. A few googles later, and I found a post on the bit-tech forums about a guy who made his own from a VCR spindle and an old mouse. I fancied a bit of that, so away I went and this is what I came up with. I call it the Griffin PowerFake.

It's made from an old PS/2 Mouse, a project box and, yep you guessed it, an old R/C car.

 
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Step 1: What you will need

To build your own, you'll need the following (note that some of the parts are interchangable, say the R/C car wheel, while some are very specific, like the type of mouse you use):

  • An old PS/2 Mouse, preferably one that has a ball rather than an optical one, and one that uses a Rotary encoder as a scroll wheel, not one that uses an IR Transmitter/Detector. If you don't know what a rotary encoder looks like, see the last image of this step.
  • An old R/C car/ Other circular object you can use for rotating that fits in your hand easily. Other suggestions are the spindles from an old VCR or maybe even an old CD-ROM drive, spinning the CD like a record on a turntable.
  • A project box of your choosing, I used an old one I had lying around.
  • A metal rod of suitable length to go through your R/C car wheel, project box side and the rotary encoder.
  • Solder
  • Soldering Iron
  • Solder Wick/ Desoldering pump
  • Tape/Glue/Double sided foam pads/ Pressure sensitive tape to mount the encoder.
  • Superglue
  • Drill
  • Screwdriver
  • Small piece of strip board (Optional)
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tudgeanator says: Aug 24, 2009. 2:03 PM
Just finished mine! Woop woop! (i only started it about 15 mins ago, not when i posted my previous comment-just so you know) Thankyou so much for giving instructions on how to do this, it's so useful!
Capture2803750.jpgCapture2788765.jpgCapture2770812.jpg
Lizardking_92 says: Feb 25, 2011. 8:04 PM
I made a wireless one, it doesn't go very far, but it works nevertheless.
Wireless Scroll Mouse.JPG
wackottl says: Mar 6, 2013. 10:46 PM
Thanks for this, it was helpful for my side scroller.

http://wackomedia.com/giant-scroll-wheel/
100_3450.png
hornbadoing says: Nov 27, 2011. 1:52 PM
man, i wish i could do this. im too poor to afford a good soldering iron. all i have is an old one from like 1999 that dosnt work =(
ReCreate says: Jun 29, 2009. 2:49 PM
its called potentiometer...not encoder XD
whatsisface (author) says: Jun 29, 2009. 10:58 PM
No, it's called a rotary encoder, there's a difference.
wbilgrami says: Oct 29, 2011. 5:47 AM
I think...i don't have encoder in this mouse.but i think you can see potentiometer near left side button..please describe briefly if my mouse have encoder then where it is and if not then where can i find this encoder?
wbilgrami says: Oct 29, 2011. 5:38 AM
Hi Sir,

Please see attach image of my DELL mouse.but i can't see encoder.Can you please help me where is encoder in this mouse?
IMG0151A.jpg
whatsisface (author) says: Jan 17, 2012. 1:19 PM
It's the thing next to the left click button.
scottm_113 says: Oct 16, 2009. 6:07 PM
If this is a "Rotary Encoder" then PLESE tell us the difference between that and a "Potentiometer". After searching out the web for this part I found a discription for a Rotary Decoder but I have a hard time comparing it to what you've got in the picture.

...I'm sorry, but if it's a Duck then lets just call it a Duck.
whatsisface (author) says: Oct 17, 2009. 3:50 PM
A rotary encoder shorts two of the legs protruding from it together, followed by another different pair of legs. By interpreting this, a microcontroller can tell which direction the shaft is turning in, and thus the computer knows whether to scroll up or down.

I repeat, it is not a potentiometer.
ReCreate says: Jun 30, 2009. 9:46 AM
Really? It has 3 Pins and it looks like a potentiometer...
whatsisface (author) says: Jun 30, 2009. 9:51 AM
And its name is a rotary encoder. Just like a Voltage regulator has 3 pins and a tab for a heatsink, that doesn't make it a MOSFET.
Skyfinity says: Aug 12, 2009. 3:13 PM
Funny that you mention that. I've had to remind myself over and over to check the tiny print on those things to keep from confusing them!
crf250rider14 says: May 4, 2011. 3:24 PM
Hey there, I built mine and it doesn't seem to work. Can my regular mouse still be plugged in while I use desktop scroll wheel?
Please respond.
Thanks.
whatsisface (author) says: Jul 30, 2011. 5:41 AM
I can only say for certain on Windows as I know it can recognise two mice. Other OS's may not be able to.
MrMistermister says: Jul 16, 2011. 7:10 AM
Would this work on a Mac?
whatsisface (author) says: Jul 30, 2011. 5:36 AM
I see no reason why not, I'd check first to see if OSX can recognise and use two mice beforehand.
robot1398 says: Mar 10, 2011. 3:04 AM
i have 4 wires sticking from my mouse which one to use
red,black,green,yellow
monsterman says: Dec 9, 2010. 12:00 PM
is it possible to do this with a usb mouse?
kondzio29 says: Feb 5, 2011. 8:56 AM
Yes.
T_T_ says: Nov 6, 2010. 8:53 AM
would this work for a usb optical mouse?
yes it has a rotary encoder
whooms says: May 24, 2010. 1:58 AM
I don no ... but mine didn't work .... it's still like a mouse ... but a butchered one ... clicks still work like before (like right click or somethin') ... and when i scroll the handle thing.... nothin' happens ...:(
eggplanthunter says: Sep 20, 2009. 3:36 PM
So, After a long while, I was poking around some arcade cabinet sites, and low and behold... I found a site that had instructions on how to build a simple spinner from a mouse w/o a rotary encoder. That's right, he used an optical scroll wheel and it worked well apparently. Take a look, It might help anyone who can't get a solid state encoder.
http://arcadecontrols.com/arcade.htm
eggplanthunter says: Sep 20, 2009. 3:38 PM
Turns out the link isn't direct, so go to the controls tab on the left, then go to spinners to find the building instructions.
arepark says: Sep 16, 2009. 4:51 PM
whatsisface, you say that an IR setup is no good for this. what is the reasoning behind this? Reason I ask is I made a wheel following another post and used an IR setup. I have been using it for a few days and today it seems to be generating phantom mouse clicks. Caused by the IR? Any ideas?
Yerboogieman says: Jul 17, 2009. 11:58 PM
My dad gave me his old Wireless mouse when i ordered a new one for him, but i cannot make this, he said it works, but only half the time. But this is the first thing i thought about when i got the new one in the mail.
Hawk_Templar says: Jul 13, 2009. 1:43 AM
Hi, I really like this idea but my cable has about 5 wires running through it. Would you know without looking at it what the wires I need to solder to rotary encoder are?
crazzzik says: May 23, 2009. 12:00 PM
Is there any other piece of software for this needs? I think the idea is to actually be able to use second mouse INDEPENDENTLY from main mouse. By that I mean using just a wheel without keystrokes or use mouse buttons as modifiers
hg341 says: May 8, 2009. 10:01 PM
cool this looks like fun if i need some thing to do and i find a usb mouse ill will do this
imakethings says: Apr 9, 2009. 1:27 AM
can it be done with a wireless mouse?
whatsisface (author) says: Apr 9, 2009. 4:55 AM
I have no reason to believe it wouldn't, you'd need a way of charging it though.
tudgeanator says: Mar 9, 2009. 10:28 AM
So do you need a mouse with a scroll wheel?or are you using the ball's sensor things instead? i'm confused.
tudgeanator says: Mar 9, 2009. 10:32 AM
Sorry,I hadn't read your instructable thourorly enough.It is a scrool wheel, i now understand.
pyro-jim says: Aug 21, 2008. 4:18 AM
could you put buttons on the side maybe to emulate keyboard strokes or left and right clicks and use the software so that only this mouse would do the adjusting? that way you just press the button on the side and scroll to adjust what you want without affecting other work!
pufferboytbh says: Mar 2, 2009. 1:54 PM
Yeah, I tried hotwiring the buttons externally, and it worked. Find the two terminals on each button that are used, only 2/3 are used.
whatsisface (author) says: Aug 21, 2008. 5:02 AM
Yes, thats very possible.
pyro-jim says: Aug 23, 2008. 11:52 AM
Can the software make each mouse do different things; for example: make the left mouse button on the griffen wheel emulate a keystroke? Or does anybody know of some software that can do this?
nathantokala says: Jun 30, 2009. 10:20 PM
macs have a softwar called keyboardmouse that will probably do the trick
whatsisface (author) says: Aug 23, 2008. 12:27 PM
This software won't do that, and I'm personally not aware of any that can.
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