Step 4: Attaching Switches and Potentiometers

Installing them is pretty basic, drill a hole the width of the post for each potentiometer, but plan it out so they don't bump into the motors. These have a hex nut that allows you to tighten them down from the outside of the case. A lot of potentiometers have a little vertical nub that rises from the top of the potentiometer, but keeps it from being flush against the case, I just snap them off with needle-nose pliers.

#1 & #2
I cut each potentiometer hole 1/2" from the base of the conduit box through a side panel (see pictures). Thread them through, align their terminals towards the middle, and tighten the hex nut.

#3 & #4
These two attach to the top panel of the conduit box,and it's important to make sure the main chunk of the potentiometer doesn't bump into a motor, since it's really compact in the box. Simply place them in-between motors.

On/Off Switches
These allow me to completely kill power running to any individual motor. They aren't absolutely necessary to kill a mirror, since a potentiometer turned all the way on (Max resistance) will kill the juice anyways. Stopping the motor by resisting all the electricity rapidly drains the batteries by turning all that power into heat. They add quite a bit of complexity to this mod, and if you don't feel like going through all the work for installing switches, you don't have to, but I find them useful.

Each switch attaches just like the potentiometers, drill a hole and thread on the hex nut from the outer side. Each switch should be pretty close to its potentiometer, leave room for the potentiometer decorative knobs to fit on top of their posts. Those knobs attach by a tiny screw in the side of them squishing onto the post.

The images below show how the on/off switches are oriented.

Master Power Switch (The Big Red Button)
This switch controls the power to all four on/off switches, and acts as a kill-switch in case you need to turn everything quickly off. Realistically, the switch I got is complete overkill and over-sized for this project, but it seemed like a fun attachment to use. Again, see the pictures for where the switch goes through. I get some comments about how it looks like it's about to activate a bomb.

Power Plug
Take a 9v power connector, drill two tiny holes for the positive and negative wires to enter the box, put them through, and hot-glue it down. A picture below illustrates what I mean.
One thing I saw used in a laser light show was to fire a laser at a small mirror attached to a cheap speaker. The laser would bounce along in time to the music. What I was thinking is: What if that beam had already been turned into a circle by a rotating mirror?
Believe it or not, I have done that exact thing, thinking how awesome it would be. I have attached a below picture of another laser project, where a laser bounces off a mirror glued to a speaker, and passes through a transmission matrix diffraction grating (complexo-speak for turning one laser beam into a thousand duplicates). That picture below is of the speaker being plugged into my television, and projecting onto my ceiling. As for how it turns out blending them. You get a blob. A big, fuzzy, random green blob. It's pretty underwhelming, but it is a laser project, so you could still show it off to some unknowledgeable newbie and have them be amazed ;)
I like doing that sort of things in a really dark room after getting a sugar / caffeine / sleep deprivation induced high.
It's even better when you combine the sleep deprivation, stimulants, laser lights, and some solid electronic trance music.
Ever heard of Anger Fist? That's my favourite trippin' out past 3 am music.
I have friends who greatly enjoy his music, they tell me he has some really original sounds and track structures, and successfully blends old (early->mid 90's) urban sounds with modern hardcore techno. I looked up some of his stuff, however, most gabber is still too hard for me, except maybe DJ Kurt, Teranoid, and Scott Brown. As far as tripping out music for sleep deprivation, check out psy-trance, songs like Bust a Move and Mush Mushi by Infected Mushroom, LSD by Hallucinogen, and Solid Electronics and 1,000,000 Years From Today by Astral Projection. All those tracks are designed to help druggies on LSD and MDMA enhance their trip, since I don't do any intoxicants, I find the music itself to be mind-blowing.
<p>Adoration to the aum trancewave... early 90's very yummy till today. Check out Matt Bukovski he has some really good tracks out there. </p>
Whoah, that<em> does </em>sound trippy.<br /> <br /> Thanks. For a non intoxicant alternative, go for triple chocolate ice cream (the real stuff) with just as much ground coffee beans and crushed Tim Tams. A personal favourite.<br />
I've read through your project and wondered how big of a shape does this make? Is it a large shape if you use it from the other side of the room? Any suggestions as to if a cheap store bought laser pointer will work as well (not a lot of available funds)? Thanks!
Fairly big. From a distance of about 10' away, the projection is around 1 1/2' wide. From about 20' the image is around 4' wide. It expands pretty quickly, you can easily manage how big you want it to be with the distance you stand. As for a cheap laser pointer, I have never heard of any brick and mortar/real-life store that sells cheap green laser pointers. I linked to LEDShoppe.com which sells 5mW lasers for $12. And Rayfoss has some very cheap ones too. What is $12 online I have seen for $90 in a real store. I can only suggest purchasing them online, as you'll save so much money, on top of getting a better product. If you absolutely must have a laser pointer today, and are willing to get ripped off, go to The Sharper Image, any Maps/Astronomy store, or if you have one, a local specialty light and toy store.
why does it have to be green?
It doesn't have to be green, you can use any color you wish. Lasers are measured by mW, and depending on their wavelength (color), it's harder to make more intense light. A red laser beam is much cheaper and easier to create than a violet one (the red wavelength is much longer), so you can find a 100mW red for around $80. Purchasing a 100mW violet may cost $800-1600 depending on where you look (though some hobbyists build their own out of PS3 blu-ray drives for much cheaper). I use green because it is the most bang for your buck. Human eyes are most sensitive to a turqoise/green color, and mW for mW, green lasers appear much brighter. A 20mW green can appear about (guesstimating) 5 times brighter than a 20mW blue, despite them being the same power. As for your second question about faster motors, I find that you get more interesting patterns with slower speeds actually. It's all semi-random on what patterns you get with the combinations of mirrors. Faster speeds can do two things: 1) make your patterns shift much more quickly (and be harder to control); 2) when multiple motors are running at very-high speeds, if you can get a stable pattern to be created, you can get some extremely intricate/complex shapes, more-so than with slower speeds.
Thanks for the in depth reply. At first I was thinking of using all high speed motors but you've changed my mind. I may, however, incorporate a fifth optional high speed motor just for kicks. I'll post pictures if I make it that far. also: http://hyperphysics.phy-astr.gsu.edu/hbase/vision/bright.html ^Your point about green wavelengths (at least in the dark) is confirmed above.
You are correct, that 507nm is the wavelength human eyes are most sensitive to at night. Why 507nm? That is the average wavelength of reflected light off the moon passing through the atmosphere at night. If you look directly at the moon, you may say it looks white or bluish white, however snag a spectroscope and the colors will be more in the green area of the spectrum. In short, it helps you make the most of the limited moonlight for activity during night.
cool! it's amazing how that trait evolved.
I imagine all the genetic branches with 510nm sensitivity were eaten by tigers or bears while roaming around at night-time ;D
<p>Lol that made me have to clean up my computer screen... dont drink coffee and read that comment. </p>
hahaha! My crazy idea is that all the genetic branches with 510 nm sensitivity fell into chasms.
Wow I'm glad instructables reformatted my comment...
i'm so excited to try this build! what effect does a faster motor have on the image?
<p>Busy looking at doing this project I did a basic prototype and it is working brilliantly. However I had a question about the laser duty cycles. Most of the laser all have a 3-5 minute on duty cycle and then a 30-60 second off duty cycle. Now from my understanding this is due to heat build up in the diode. How did you handle this? Is it possible to perhaps extend this duty cycle with a attached heat sink?</p>
Major kudos on the project, glad you have made excellent progress :-)<br> <br> You are correct, most laser diodes have a duty cycle of under 5 minutes, after which the need to cool down. The heat may not necessarily be conducted to the diode housing, the heat is stored internally.&nbsp;Too much heat weakens (&quot;cooks&quot;) the diode. Fortunately, most laser diodes come in a metal housing that can be removed and attached to a heatsink. The higher power the laser, the quicker it cooks/degrades.<br> <br> A heatsink with a <strong>FAN </strong>is the most common way to extend the life of the laser. Purchasing a laser heatsink tends to be fairly expensive. The best solution I've found is either a) mini-motor heatsinks, or b) CPU heatsinks and boring out the center to the diameter of the diode housing. You WILL need a conductor between the diode and its heatsink, just smother the heck out of the diode and heatsink with thermal paste. The other good option is to purchase a laser in which the structure itself (handle that contains the battery) is metal and acts as a heatsink. Lots of surface area! With a CPU heatsink w/ fan, I would feel comfortable using up to a 250mW laser for an hour or two. With that said, ANY laser should not be run indefinitely, no matter how good the cooling system.<br> <br> This is by no means technically correct, there will always be degradation when a laser runs for an extended period of time, but in practice, if the laser is under 100mW you don't need to worry about duty cycles if they are shorter than 20 minutes. Duty cycles become dangerous to the point of frying diodes when high powers are involved, or for extensive amounts of time (think measuring in hours for a continuous night-time display).<br> <br> Hope that helps, and thanks for asking!
<p>Ok so at least I was thinking along those lines. On another note I have managed to find a way to almost perfectly mount those pesky mirrors to the motors. Some balsa wood with the front cut at 1-2 degree angles and the laser projection is much much sharper and defined. Will put together a video for it once I have refined the technique a bit. Never thought my wood working lessons from my Grandfather would be so useful in this project. This project has sparked something in my 5 year old daughter and we are now having science lessons everyday so I can explain to her how things work. Wish I could see through her eyes for a moment as this appears completely magical to her. Thanks for the reply.</p>
How would one integrate a spirograph into a party SAFELY? Would you aim it at the air, a wall, the ground? Lawyers are expensive.
<p>As long as the laser beam is moving (&quot;scanning,&quot; in the parlance of lasers) there is no danger to anybody's eyeballs. Even the relatively dangerous green laser (as opposed to the common red, and I'm only talking laser pointers here, mW-wise) requires over 1/4 second exposure to the direct or reflected beam, and this just doesn't occur with the laser point whipping by so quickly that it appears to be a line. :-)</p>
Hi all, <br> <br>I want to do this project but I can not find 100 ohm potentiometers, the only ones I am able to find are 100k (which atre not the same, right?) <br>I would be very happy if someone helped me out on this.
I've actually had this one finished for a while now based off this project. I think it turned out very well. I'm in the design phase of making a 2nd &quot;smarter&quot; one that utilizes a micro-controller. This way I can use it to PWM out to the motors (through a motor driver) to get consistent use each time, have a digital display showing the speed of each motor and have the ability to save pre-programmed designs as well as have a random mode that just does random designs. I'd also like to implement a speaker to so it interacts somewhat with the music being played. <br> <br>Here's a demo: https://www.youtube.com/watch?v=MXodmgpdcgA&amp;list=UUDADfKyYBMH_d9r3L4t3-8A&amp;index=6&amp;feature=plcp
Hi! I'm doing this spirograph as an honors project for physics II. (Thanks for posting it, btw) Your instructions are written beautifully and I have learned a great deal about parts, tools, and methods while making this. My goal was to learn how to solder, which I have... but also a whole lot more!<br> <br> Anyhow, my only stumbling block has been in placing the motor-mounted mirrors. Could there be an easier way to place them in the box other than hot glue? I find the need to adjust them as I work down the line and pulling them out gets messy and risks knocking off a mirror each time. My professor suggested that I use air dry clay (which helped with the slight z-axis angle from the cone shaped projection) but when it dried and I went to glue it permanently down... it moved out of the desired position.<br> <br> I really knew nothing about any part of this kind of thing when I chose to do this. I had a drill, hot glue gun, and pliers when I started out, lol. :) This has been a fun and rewarding experience so far... I just want to play with it now! Do you have any suggestions for me? Should I trace around the bottoms of the motors in the box to help line them up? Maybe there is a defined angle arrangement that always works? Will they automatically line up if I'm playing &quot;Dark side of the moon&quot;? (wouldn't that be cool?) I usually miss the most obvious things... thank you so much for any kind of input you have!
If you wanted to make it a bit easier on yourself, you can try using 40mm Case Fans from newegg. They're dirt cheap, but they run at 12v instead of 3v like hobby motors. Much, much easier to align and work with, but they're bigger. You can throw a folded piece of paper or a shiv underneath the mirror, and have a nice, stable surface to glue it to. I've seen someone put a mount on them and bolt them from underneath the base whenever he needs to move them.<br> <br> If you want to adjust a mirror because you glued the motor in the wrong spot. Throw the box in the freezer for a good 20-30 minutes. Then with wide-grip pliers, grab and do a rapid twisting motion. You'll very easily and cleanly snap off the hot glue =].<br> <br> For mounts, there is an absurd amount of RC Airplane mounts for 3v hobby motors, they're semi expensive though, like $5-8 per motor, but, they're solid. I'd definitely mark where you want to put them with a sharpie.<br> <br> I made a picture detailing the *ideal* layout if &nbsp;you have enough space. I hope it helps.<br>
I looked at those case fans and they look like they will greatly ease my troubles. I like having something solid to glue the mirrors to and a shiv sounds much nicer than my inexperienced eyeballing ability. You are a genius! I'm ordering them today. Also, I'm using 100ohm 2W pots for this... will I need to add a resistor or something since the fans are 12V? Might it limit my shapes or shake off my mirrors if I don't?<br> <br> I hadn't thought to put the box in the freezer either, so thank you for that tip. I have quite a bit of glue residue that I can now eliminate. :) I look forward to trying your 108 degree ring out too. I think my conduit box is larger than the one you used, so I might have the room to have it work. It will be way more easy to mark the fan placement than it was ompared to my lumps of air dried clay.<br> <br> I'm really glad that I asked here about this... you've made my day! Thanks again for your help.
I DID IT! It's done. Thank you so much for your input, again. I needed to keep thinking it through and your response encouraged me to do so. :)<br> <br><br> <br>I didn't have time for the case fans to come in from China before I needed to turn in my project, so I had to improvise. I took some wick tabs from the bottom of cheap votive candles and soldered them to the tip of the motor. That gave me a solid surface to glue the mirrors on to. Also, the tabs are somewhat flexible and I could adjust the tilt after putting them on. That enabled me to use Lego's as the motor stands, since my tilt wasn't so large.<br> <br><br> <br>I'm really excited about this working, it is the most intricate project I've ever made and EVERYBODY loves playing with it! I have to let my teacher keep this one and I've already started my second one (for me to keep). I'm trying your 108 degree model and it really seems to be working great. You have made the the envy of my pre-engineering classmates, lol. I'm already enrolled in the fall electronics engineering program, after enjoying this project so much. Thanks for the help and the inspiration, man! :)
Glad to hear it worked out so well, that's a major reason I write these guides, is to encourage others to push themselves and have fun learning. Not to mention the often very-cool projects they tend to be ;D.<br> <br> If you really want to have fun with it, use it outside on a foggy night, or throw up some dust or make smoke and fire the beam into it. We've had a few campfires were people have fun pointing the beam up into the rising smoke, and it's pretty&nbsp;mesmerizing.<br> <br> If you make anything that's cool or a video or have pics, please show them to me. It's always neat to see the work of others, often you guys tend to improve upon my designs in ways I never would have thought of. Keep up the great work!
Just got mine done and posted it today!<br> <a href="http://www.instructables.com/id/4-Motor-100mw-532nm-Laser-Spirograph-Budget-Build-/" rel="nofollow">http://www.instructables.com/id/4-Motor-100mw-532nm-Laser-Spirograph-Budget-Build-/</a><br> <br> <br> Thanks for sharing your's with us!!!!! It was the push I needed to get one built.<br> <div> <iframe frameborder="0" height="315" src="http://www.youtube.com/embed/h60ekvdJbSg" width="420"></iframe></div> <br> <br>
I think I've been hit by the laser bug and hard at that. Over the past 3 weeks I've been preoccupied with all aspects of the working laser...Ive purchased The Arctic 3 by Wicked Lasers and several turnkey laser projectors and scanners by American DJ. With that being said It's no surprise that I must build one one now. This project is great and just what I was looking for as a my standard for this first attempt. Please, I'm open for any and all suggestions that may help me actually achieve this <br>Thank you and look forward to being a part of this forum.
Regarding how to adjust the wobble: do a google search on &quot;harmonograph&quot; and see if that gives any helpful pointers.
would this instructable work with a dollar store laser pointer? very cool project and i am considering builing one of my own, thanks!
Will it work? Yes. Will it be as stunning and easy to see? Unlikely. If you're going to spend ~$20-100 in parts, spend a little for a nice laser, even a $10 5mW is a huge step up from the 0.25mW dollar store lasers.
Regarding your excellent safety warning: Some years ago (15? 20? more?) I very foolishly decided to look inside the laser checkout window at the grocery store checkout and get a closer look at that pretty red laser. It was the briefest flash I could manage and within the first half-second afterwards I realized &quot;That was really stupid.&quot; The blackout spot in the middle of my eye was, fortunately, just a small spot that eventually healed, but it took over a decade.<br><br>ALL PERSONS DEALING WITH LASERS IN THIS OR ANY OTHER INSTRUCTABLE SHOULD TAKE THIS WARNING WITH THE UTMOST SERIOUSNESS!!!
Could I get away with using glass mirrors instead of acrylic?<br>
Glass should work just fine. Be aware that glass is quite a bit heavier than acrylic, it might require more support.
Do you mean I should put more weight on the opposite end of the motor?
I mean to either a) use epoxy rather than hot glue, which is very messy but very strong, or b) use a 40mm computer fan as the base rather than a 3v hobby motor.
Followed your design and it came out amazing! Thanks for the great guide.<br><br><iframe frameborder="0" height="315" src="http://www.youtube.com/embed/tfXUHAUdRJc" width="560"></iframe>
im looking into building an 8 mirror RGB verson of this. i tracked down affordable front surface mirrors in the form of #3 dental mirrors (20mm). they come in a pack of 12 for roughly $20 on the good ole flebay. just gotta remove them from their holder/backing without breaking them. ill be using a 200mw green, 500mw red and 400mw UV in this.
Do you have to keep turning the knobs to get all the variation in the patterns, or does the variation occur naturally as the spirograph is allowed to run?
I am physically turning the knobs to adjust their speed. To have the spirograph run on it's own would require programming an arduino to use pulse-width-modulation with the motors to vary the speed, which is pretty complex.
Awesome, thank you for your reply. I'm planning on building one based off of your design. I thought about adding an additional mirror at the end, but instead of attaching it to a motor, attaching the mirror to some type of membrane that's been pulled tight across an opening in the box opposite the projection window. When set next to a speaker, (I'm hoping) the sound waves would cause the membrane to move back and forth causing the projection to shrink and expand, pulsating with the music (or at the very least have some type of interesting response). Do you think it might work?
If you want to go that method, you would likely use mylar film. The reflective stuff is annoying and expensive to get though, though the cheap stuff can sometimes be found in electrostatic bags for electronics<br><br>If you want sound reactivity, the easiest method would be gluing a mirror directly to a speaker. It wouldn't make a clean expand/contract image, but it would shake it's vibration according to how strong the bass is.<br><br>Just an idea =]
Can I make the same with a CD / DVD Drive Laser diode?<br>Thanks in advance, :)
Yes, using a DVD+RW laser diode works pretty well. However it takes a lot more than just the diode to make the laser turn on, circuitry is needed to control the voltage and the amperage given to the diode. Laserpointforums.com has guides on how to build a high-powered laser pointer/module using a diode from a drive.

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Bio: I have a passion for tweaking things. Whether it be modding video game consoles, creating custom laser displays, or any creations with lights I love ... More »
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