Step 5: Wiring Diagram

First you will need a gear motor. 

If you wish to modify a standard RC servo for your geared motor then follow this 'ible: 

If you use a Parallax continuous rotation servo there is no need to modify the gears, but you will have to modify the wiring to the servo's motor.

The diagram above indicates how you will wire the motor, microswitch and battery pack to the pins on the toggle switch.  This is called 'Dead-Bugging' and is a prototyping method from way back.

It's a very simple circuit but it's easy to mess up the wiring.  Follow the directions carefully or purchase the Useless Printed Circuit Board from us to speed up and greatly simplify the wiring process.  And a cool LEDs to the circuit too.

Wire the gear motor to the indicated pins.

A short length of wire connects opposite pins on the toggle.

Another wire connects the other outside pins on the toggle and this wire has the microswitch in-line.

The battery pack goes to the other remaining pin on the toggle.

If you find that the motor is running in the opposite direction from what is needed, simply reverse the wires going to the motor.

tydarby posted the great graphic below, showing how wire up a modified servo .  The pins to use on the micro-switch are the common (C) and normally closed (NC).  Nothing should be connected to the normally open (NO) pin.


Batteries: The original parts list used a 4 AA holder but you may find that 4 batteries driving the machine makes for way too fast operation.  Blink, and you'll miss it.  

In most cases you should be able to get away with just 2 or 3 AA batteries, making the overall action more slower, and more visible.

Keep in mind that the our kit only uses 2 AA batteries.

More on Motors:
I originally chose to use servo's because they are available almost everywhere, and are standardized, but you don't have to use one. Just about any motor should work, as long as it's geared down, and has enough torque to flip the switch.

The more salvaged parts you use, the better.

Keep in mind that another reason for using a geared motor is to prevent bounce-back from happening when the machine shuts off. Without the gearing, motor wouldn't keep the arm pressing down on the micro-switch while it's off. The machine's arm would just keep hitting the switch, turn off then on, then off, then on....

The next couple of steps show the original way I made my machine.  If you're building one using the information above, then SKIP the next 4 steps and jump to step 10.

<p>I love these :) Great job, looks amazing !</p>
<p>The &quot;troll machine&quot; sounds like a pretty good name for this device. I think it would make a great prank present for a close friend.</p>
<p> <br> <br>Thanks for the post <br> and great tips..even I also think that hard work is the most important aspect <br> of getting success..</p><p><a href="http://www.monacopropertylistings.com" rel="nofollow">agenzie immobiliari a Monaco</a></p>
I found something similar. Make sure you watch until the end.<br> <object style="height: 390.0px;width: 640.0px;"><param name="movie" value="http://www.youtube.com/v/UmQ5LsNMXZ4?version=3"><param name="allowFullScreen" value="true"><param name="allowScriptAccess" value="always"></object><object style="height: 390.0px;width: 640.0px;"><param name="movie" value="http://www.youtube.com/v/UmQ5LsNMXZ4?version=3"><param name="allowFullScreen" value="true"><param name="allowScriptAccess" value="always"><embed allowfullscreen="true" allowscriptaccess="always" height="390" src="http://www.youtube.com/v/UmQ5LsNMXZ4?version=3" type="application/x-shockwave-flash" width="640"></embed></object>
<p>Ok, that's an awesome mod!</p>
<p>This one is cooler XD</p>
<p>what happened there, AI!!!!!!!+ wheels.</p>
it's the useless-inator... i thought doofenshmirtz gave up.<br>ah well...
Mensagens subliminares escondidas no v&iacute;deo: Se voc&ecirc; jog&aacute;-lo para tr&aacute;s, voc&ecirc; pode ouvir claramente Ozzy Osborne (from <a href="http://www.45bet.com/betclic" rel="nofollow">Betclic</a>) comandando voc&ecirc; para construir, e adora&ccedil;&atilde;o do culto da m&aacute;quina....
honestly do not know why you say useless. I often use and works great<br><br>emailing http://www.mailin.fr/
get the sledgehammer<br>
haha saw this a couple months ago, still funny!
dude this thing is sico!!!
nice video<br>
I saw this video two days ago, and made one yesterday using Lego Mindstorm, and saw this instructable today
The exorcist meets the most useless machine ever. lol<br><br>Thanks for the nightmare :)
<p>Here's an animated schematic of the switch-only version (without crossed wires!!!) that explains how it works:</p>
<p>I used to have one years ago. It was a coin bank. If you laid a coin on the box the door would open, the fingers extend, grab the coin and slide it into the bank and the door would shut. </p>
<p>We have one on Kickstarter if anyone interested. It's kit with 45 pieces that you assemble without soldering to create the mechanism. Not everybody has a soldering iron. ;)</p><p><a href="https://www.kickstarter.com/projects/67279121/useless-machine-in-a-can-fun-kit-for-everyone" rel="nofollow">https://www.kickstarter.com/projects/67279121/useless-machine-in-a-can-fun-kit-for-everyone</a></p>
<p>very, very good, usless it might be, amusing definately!</p>
<p>Just saw this. You've officially &quot;made it&quot; when your ideas are being knocked off overseas....</p><p>http://www.dx.com/p/neje-wooden-useless-fully-assembled-machine-box-toy-w-logo-brown-2-x-aa-365899#.VKtghyvF98E</p>
<p>This is interesting. I will try this out</p>
Hi, my servo is going only &quot;forward&quot; until it's stopped by mechanic lock. I dont know what is wrong. And sorry for my english.
<p>Hi, I just built one from the schematics as well and it does the exact same thing as yours: wherever the switch is it keeps on going on one direction and on one side of the switch if you press the button it stops. so did you find the solution ?</p>
<p>Not really useless.</p><p>It can be used as e Cat-Toy.</p><p>but add a small, but noticeable wooden plate to the small lever-switch, then the cat can better punch it to activate the box.</p><p>in this video at 2.07 a cat plays with something like this:</p><p><br><iframe allowfullscreen="" frameborder="0" height="281" src="//www.youtube.com/embed/PEykiwFg39k" width="500"></iframe></p><p>in that version the arm and the area around it are covered by plush.</p><p>That looks like a small kitten in the box</p>
<p>What are the advantages of the dead bug?</p>
I want to try to make this!!
<p>Same here!</p>
We simplify a circuit in the machine. Only a switch with two points is used. No chip, no servo, no spring and no additional switch are used. The movie below shows its structure and action. <br>http://youtu.be/3Pl0nNj8Q4s <br>
Newbie question: Why are there no resistors in the wiring (referring to the design which doesn't use the 555 timer)? Are the internal resistances of the servo, batteries, switch, and wires enough to prevent an overly large amount of current from running through the circuit? <br> <br>If that's the case, then is there a way to get the numerical values for these internal resistances?
You are correct. If wired correctly it is limited mostly to the resistance in motor, and it's only a few ohms (it will vary from motor to motor, but lets say 5-6 ohms). <br> <br>Ideally, the switches and wire should have no resistance, but in the real world they will add a tiny bit too. <br> <br>The battery, you don't worry about it's internal resistance. <br> <br>To measure the actual resistance, take the batteries out and measure the ohms across the + &amp; - of the battery-holder. <br> <br>So if the whole circuit is 6 ohms and you're using 3 volts, that's half an amp of current. Extra points if you can figure out how many watts that is!
Just finished mine and it was a little more difficult than i thought it would be, but worth it. I used krazy glue to hold everything in place. If anyone has an issue with your servo not being strong enough to flick the switch like it did, U can take switch apart and change out the spring in the middle of the switch ( i used a pen spring instead of original spring inside of the switch and it works flawlessly now.) I went with the simple method with the 2 switches and a cigar box which already came with a center cut in the lid. Will now make a great conversation piece on coffee table. Good luck to everyone who tries to build one!!! Well worth the few hours of effort.
Thanks for this. I had to do the same thing. Works great.
Right on. Sometimes you can 'break in' a stiff toggle just be flipping it on/off a bunch of times but replacing the spring, that's a new one!<br><br>Thanks!
Built a couple of machines using solarbotics Gm2 motor, toggle and micro switch. They work fine, but they shatter one time when hitting micro. Any idea on what is really happening. Motor does have a little play
This is so cute! there must be some ways to use them.
Great idea! This seems like a really good way to do some <a href="http://www.christoffersonmoving.com/highvalue.html" rel="nofollow">machinery moving in chicago</a>.
What's the name of that song on the video?
Wow! This is great! Thank you so much!
Hi can you provide me the Circuit diagram and the PCB drawing as well as the ttemplates of the Ultimate machine please. I wish to make this for a school project but i need this infomation. <br>Thanks <br>Email to:yan0055@gwsc.vic.edu.au
Hi I made a useless machine (the version in step 5) and I have a problem of the arm jumping on the off microswitch. basicly when it goes back in it hits the off microswitch and jumps up and down and up and down. It is not ment to do this and I dunno how to solve it. I know the micro switch is working to turn it off becuase if I press it by hand it works. any ideas?
The bounce-back problem can be eliminated by moving the micro-switch to a spot were the arm doesn't slam into it. <br> <br>The Ultimate Useless Machine that I sell uses a 'cam' to activate the micro: http://frivolousengineering.com/wp-content/uploads/2011/11/06CUcam.jpg <br> <br>Check the above photo to see how it's arranged. Instead of the arm crashing into the micro, the bump on the cam activates the micro and allows the motor to continue moving a few degrees before coming to rest.
for some reason.....i find this robot cute.....wierd......maybe because i find myself annoying too... <br> <br>great instructable by the way!
Very nice! Reminds me of the mechanical novelty toy that was a small opaque black plastic box with a slit for a coin where your switch is....when you placed a coin in the slot a little hand would come up out of the box and snatch the coin. Fun!

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Bio: In December 2009 I published The Most Useless Machine Ever. 2011 formed The Frivolous Engineering Company Inc. in order to supply Useless Machines to the ... More »
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