techno geek roulette or who makes the coffee

7/29/2019 Techno Geek Roulette or Who Makes the Coffee

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http://www.instructables.com/id/Techno-geek-Roulette-or-Who-Makes-the-Coffee/

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Techno-geek Roulette (or Who Makes the Coffee?)by AndyGadget on June 29, 2008

Table of Contents

Techno-geek Roulette (or Who Makes the Coffee?) ....................................................................................

Intro: Techno-geek Roulette (or Who Makes the Coffee?) ............................................................................

Step 1: Bits and PCs ........................................................................................................

Step 2: Preparing the Power Supply ............................................................................................

Step 3: Hacking the CDROM Drive .............................................................................................

Step 4: The Disk of Destiny ...................................................................................................

Step 5: Putting it all Together ..................................................................................................

Step 6: Who Makes the Coffee? ...............................................................................................

Related Instructables ........................................................................................................

Comments ................................................................................................................
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Intro: Techno-geek Roulette (or Who Makes the Coffee?)This is a gadget made from recycled computer parts to give an absolute, unequivocal and irrefutable answer to that eternal office question - "Whose turn is it to makthe coffee?" Each time the power is turned on, this wonderful device will randomly select a person to do the coffee-run.

Step 1:Bits and PCsYou will need the power supply unit (PSU), CDROM drive and a blanking plate from an old computer - The older the better. Also, a blank writable CDROM, a selectionsmall tools, a glue gun and a way of decorating the CD. If you're after accuracy, a protractor too.

The blanking plate is the 'L' shaped bit of metal you take out when you put a plug-in card in the PC. If you're like me, you've probably got dozens lying around until youactually come to need one - then you can't find a single one.

The CD drive must be a read-only type. Some drives work better than others for this. If you have a couple of old drives available, power them up in turn with a blankwriteable CD in and see which one spins for longest before stopping. This will be the best drive.

The best type of blank CD to use is the type with a matte white topside which you can print onto with an inkjet printer. If you don't have printing capability, you could uspermanent ink marker pens or enamel paint.


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Step 2:Preparing the Power SupplyIt's best to do this first, as the PSU will help us later. The simpler the power supply the better as more recent ones are harder to get working out of a system. The typewhich has a 20 way large connector is ideal.

Unplug all the power connections inside the computer and remove the power supply unit. You will usually find three screws on the back panel of the PC holding it. Oncout, blow hard into the ventilation holes to remove the dust of ages.

Now you're into the PC, you can take out the CDROM drive (usually a couple of screws into the side) and a blanking plate from the back panel.If the large connector from the PSU has a green wire in the position shown in the photo, connect a wire link to it, and to one of the black wires next to it. This is the leawhich would go to the power switch and needs to be grounded to turn the supply on.

Step 3:Hacking the CDROM DriveThere are many, many different models of CDROM drive, but they are all put together in roughly the same way. Your drive may not be exactly like this, but it won't be tdifferent.

What we want to do is to remove the cover and tray of the CD drive so we can see what's going on inside the drive. There is a low power laser in there, so don't lookdirectly down on the assembly when it's running. Once we've got the disk on the laser light will be blocked.

With the PSU connected, turn on the supply and eject the tray. Turn off and disconnect.

Turn the drive over and remove the four screws underneath. Ease the bottom and the wrap-round top cover off the drive. Keep the flat bottom panel - we'll be using itagain later.

Remove the tray. It may come out if you bend the middle upwards, or you may need to cut a plastic clip or two with wire cutters. Once you're done, it should look like tfourth photo.


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Step 4:The Disk of DestinyThis is where you can unleash your creative talents. Mine are minimal, so I used the CDROM printing software which came with my Canon printer and a bit of clipart.

The important thing here is dividing the disk into the right number of segments. You can either eyeball it like I did, or use a protractor to get the exact angle for the lineDivide the number of names into 360 to get the angle (e.g. 5 people is 360/5 = 72 degrees).

We are using a blank writeable CD so that the drive is aware that there is a disk in there, but can't make sense of i t. It spins and spins, and eventually gives up, leavinthe disk in a random position.

Note : Canon Pixma printers sold in the USA have the CDROM printing function disabled and do not include a tray, but you can enable the CD printing with the help oTHIS instructable, and get a tray from eBay, or make one like THIS . (I'm in the UK, so mine was already enabled ;)
http://www.instructables.com/id/Canon-Pixma-CD-disk-tray/http://www.instructables.com/id/Modify-Canon-Pixma-Printer-to-Print-on-CDs--DVDs/


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Step 5:Putting it all TogetherUse cyanoacrylate glue (superglue) to attach the decorated CD to the drive spindle. We want the disk to sit flat, and hot-glue is too bulky for this. If the spindle isn't in tright position for the disk to spin freely, you may need to find the arm or plate which moves it. Don't force anything. Once you find the right part it should move easily alock in place. The fourth photo shows where mine was. You may need to power up the drive and press the open / close button to get it to the right state.

Once the disk is attached, this button is going to be a liability, so carefully 'disable' it with a pair of wire cutters (and the power turned off).

Bend the blanking plate so that one end sits over the top of the drive, and the other just overlaps the disk. Cut it to length at the back, and draw on the arrow with amarker pen. Hot-glue the pointer in place (third photo).

Using more hot glue, stick the flat plate from the case to the back of the drive. This will give you a flat surface at the back. Now glue this firmly to the PSU so that that tpointer is pointing down (connector at the top) and the whole assembly sits solidly on the table.

You could cut off all the wires from the PSU except the ones to the drive. If you do this, you will have to cut and strip the green wire and then twist it together with a blawire. This should then be insulated. Make sure the other wires are cleanly cut with no stray whiskers.

Or you could drape and glue the wiring looms and connectors to the drive itself to make things look more interesting, like I did. Use the hot-glue gun for this.


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Step 6:Who Makes the Coffee?To work the gadget, leave it plugged in but with the mains wall switch turned off. At coffee time, turn on the power and wait with bated breath to see whose name stopunder the pointer. Turn off the wall switch.

If the disk stops precisely on a dividing line, coffee duty will be decided by a round of 'rock paper scissors' between the two people indicated.

The selected person must now go and make the coffee, or, in the case of those unfortunate enough to have one, persuade the drinks machine to produce a beveragewhich is almost, but not quite, entirely unlike coffee.

As the Kaptin says below, this isn't limited to coffee making. With different disks you could replace throwing a dice, play roulette, make vital life decisions etc. Yourimagination is the limit!

(Some drive motors seem to have a couple of dozen angles they prefer to stop at. If you're thinking of using more than ten or so sectors, don't use one of these as it wskew the randomness. You can feel it as a lumpyness when you turn the disk by hand.)
http://www.instructables.com/id/Techno-geek-Roulette-or-Who-Makes-the-Coffee/step6/Who-Makes-the-Coffee/


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Comments

35 comments Add Comment

Kornelie says: Apr 8, 2010. 9:39 AM REPhaha, sweet :)

hapman9 says: Jul 1, 2009. 4:13 PM REPHey i have tried this but it didn`t last long as the cd drive fried if you know a sollution to this please email me back at [email protected] Thanks thawould be great

AndyGadget says: Jul 1, 2009. 11:25 PM REPMust have been a dodgy drive you were using which would have failed anyway. This isn't making it do anything i t's not designed to do. It's just using thnormal cycle it would go through if an unreadable disk is put in it. Try a different drive.

hapman9 says: Jul 4, 2009. 12:56 AM REPthx for that i am going to get a new old tower from a store i know
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dark sponge says: Aug 10, 2008. 4:10 PM REP"...to produce a beverage which is almost, but not quite, entirely unlike coffee"

-The Hitchhiker's Guide to the Galaxy

I absolutely love that book!

dontno says: Aug 12, 2008. 6:08 PM REPDon't forget your towel!

Derin says: Sep 14, 2008. 1:04 AM REPThe towel in towel.blinkenlights.nl?

rct1113 says: Aug 10, 2008. 9:33 PM REPI thought it was tea....

AndyGadget says: Aug 11, 2008. 2:50 AM REPYep, it was tea; I paraphrased the great Mr Adams. And machine tea is always at least infinitely worse than machine coffee. To keep that brain cellworking it has to be the 'real thing'. (And I dont mean Coke - although that statement could open up a whole new box of frogs ;)

dark sponge says: Aug 11, 2008. 7:45 AM REPOops, I forgot. I read the book awhile ago, and can't remember some of the details. Yes, it was tea.

"...to produce a beverage which is almost, but not quite, entirely unlike tea"

shammallamaman says: Aug 10, 2008. 9:25 PM REPAmen Brother

twenglish1 says: Aug 29, 2008. 5:23 PM REPnot sure if it has been said but you should mark a pointer on the cd tray inside the computer put the disk in and after a couple seconds open the drive andlook where it is

skappa says: Aug 26, 2008. 8:13 AM REPCould you also..build the "Roulette" Inside your machine? By attaching the wires of the PSU to the cd-rom drive i think it's possible. Everytime it tries to reathe disk, it starts spinning :)

Caspar says: Aug 17, 2008. 4:34 AM REPSuggestion - Get some little magnets and glue them on the dividing lines on the wheel (North pole facing outward). Now glue another on the pointer so thaas the wheel spins this magnet (North facing in) repels the ones on the wheel. If the wheel stops near a line, the repulsion of the magnets will move it oneway or another, guaranteeing no arguments. To be really sure you could put another magnet (South facing in) a bit away from the pointer so the wheel wostop in the middle of a segment. Magnets would have to be weak enough or far enough away so they did not prevent the wheel from starting when the powwas turned on. To overcome the unevenness when slowing down (which you mentioned), you could increase the inertia by making the wheel heavier, andalso allow some slippage between the shaft and wheel, or, after finding more preferred stopping places (eg 12) than people, divide the wheel into 12segments, and mark some of them "spin again"...

AndyGadget says: Aug 17, 2008. 5:48 AM REPThanks for the magnet idea, but I think I'll stick to 'rock scissors paper ;) It's only some motors which have the preferred stopping points - most don't.The one I used in the project has 24, so the six segments have 4 each. I aligned the disk so i t couldn't stop on a divider. Actually, if the number ofstopping points is not exactly divisible by the number of segments, it would be a way of biasing the result {evil grin}. If you use the more common mototype with no preferred points, this won't be an issue. The 'spin again' idea is a good one if you want a fair wheel and have the wrong number of people(and only that type of drive).

garrettmikesmith says: Aug 15, 2008. 6:08 PM REPmy shop teacher used one of these to decide what would happen to you if you came to his class tardy.

YAY RANDOM ! says: Aug 15, 2008. 4:40 AM REPI remember doing this with a hard drive.
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swag says: Aug 13, 2008. 4:57 PM REPIf this is a "pointless" contest, I'll vote.

earnst2w8 says: Aug 10, 2008. 4:53 AM REPif you use magnets or sticky tape you could add different cdroms , for different tasks( so you dont have to build 20 or so machines for 20 tasks, then you jumake 1 machine and 20 cdroms) just an idea :D

jongscx says: Aug 12, 2008. 2:22 PM REPor not even really... the spindle WAS originally designed to keep a spinning CD secure on it...

AndyGadget says: Aug 12, 2008. 3:22 PM REPThe spindle alone will not hold the CD. On the wrap-around lid (which is thrown away) there is the other half of a clamping mechanism for the disk.Because this is gone, the CD has to be glued on. If you use magnets or tape to stick another disk to the fixed one it will have to be very well balancor the whole thing is going to leap all over the place. Those things spin pretttty fast!

earnst2w8 says: Aug 13, 2008. 4:05 AM REPthats right but if you just used a round magnet with a hole in het middle i think balancing wont be such a problem

jongscx says: Aug 13, 2008. 4:23 AM REPOh yeah, ring magnets... just do two, one inside, one outside... do they make those in a decently strong variety? all I've seen are the blackferrous type, not very attractive at all...

earnst2w8 says: Aug 13, 2008. 5:29 AM REPhttp://www.magnetsource.com/Consumer%20Pages/BasesLatchesAU.htmlmagnets like this but then with a bigger hole

earnst2w8 says: Aug 13, 2008. 5:24 AM REPi dunno you can get a round magnet and drill a hole ( i dont know if it will word , never done it :D) but jou just have to search for it on thaWEBB by the way do you live in the united states and is it there now 16:23 or 4:23 i think 16.26

earnst2w8 says: Aug 13, 2008. 5:26 AM REPsorry the times arent right 'am' is mid day and 'pm' is night and in the mornig right?

jongscx says: Aug 12, 2008. 2:23 PM REP

If you flip the CD backwards so that the shiny side is out, and shine a laser on it it makes a cool design on your wall...

alex-sharetskiy says: Aug 11, 2008. 9:23 PM REPThis is worse then russian roulette! only kidding Great instructable! i would have never thought of that

KE5GQI says: Aug 11, 2008. 12:59 PM REPNice Instructable Phase 2 is to build in a bias so you never have to...

Dragonboy says: Aug 11, 2008. 1:56 AM REPVery original! Nice use of an old CD drive!

Weissensteinburg says: Aug 9, 2008. 9:40 PM REPCool! Just don't bring it to the airport...stasterisk can tell you that much.

V-Man737 says: Aug 10, 2008. 5:15 PM REPYou could put it in a cardboard box so that the wires don't scare the TSA. Then you'll be safe. ;-)
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11/11

http://www instructables com/id/Techno geek Roulette or Who Makes the Coffee/

KaptinScarlet says: Aug 10, 2008. 2:36 AM REPthat is so cool. You could make up loads of different CDs for different questions, roulette wheels, should I do it - YES / NO, she loves me - she loves me no(could be designed like a daisy with some petals missing.... etc etc and the like. SuperGlue on the first disc and then use a tiny bit of velcro evenly spaced have interchangeable discs. cool

stranoster says: Aug 10, 2008. 12:27 AM REPOooohhh. Spinney. Round and round and round. "What is your bidding my master?". Anyway looking away from the mess of punctuation behind this, this ia well made Instructable. It looks great, It's well documented and the pictures weren't taken on a cellphone. It is also very original. Good work, five stars.

Dr. Cool says: Aug 9, 2008. 6:14 PM REPAll that trouble to decide who makes the coffee? ; ) Nice Instructable Doc Cool
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techno geek roulette or who makes the coffee

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