Hypnodisc

14 May, 2010 2 comments

My version

On the Make flickr pool I found hypnodisk by osbock. From the description:

The hypno disk is a dvd with a hypno pattern glued on. It’s attached to a CD-ROM spindle motor attached to an arduino with Adafruit’s motor shield. I used a Sharp infrared rangefinder to make the hypno spin faster as you got closer. If you got too close it reverses direction.

The orginal by Kevin Osborn

I thought it was an excellent idea and wanted my own. I was getting bored with revision come the penultimate exam so I started making it one evening. It’s a fairly simple build but I took plenty of photos of the build so I’ll describe the process here.

Watching the video gives you a sense of what it feels like to watch it but it’s much better seeing it live. The limited frames per second of the camera slightly ruins the effect in my opinion.

: Testing the motor I found in my bag of motors.

: This test hypno pattern was printed on A4 paper because I need to get into university to use the A3 printers there

: Attaching motor to card with double sided tape. I eventually used to super glue to make it permanent.

: The test pattern in position.

: Starting the electronics for it

: Testing the electronics

: My failed pizza attempt I had that night. They took a ridiculously long time to make!

: Messing with the code using my laptop

: A3 pattern is now in place and I’m putting on the letters using printer sticker paper. The letters were cut out then put back in place so they were correctly aligned

: Letters getting stuck in place

: A view from the back. The blue foam blocks are to make it sit level

: The (nearly) final design

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Written by Kevin Osborn on 8 June, 2010.

Awesome. Looks really nicely finished. Where did you get the disc pattern? I’m not terribly happy with mine. Also, I see a couple of transistors. Did you make your own h-bridge?
I’m curious about your distance code too. I think your version is a lot less expensive to build than my own…
Written by JJ on 8 June, 2010.

Haven’t quite finished the page yet, the questions you’ve asked are the bits I still need to cover. In summary:

Where did you get the disc pattern?
After many searches I found one I like but the resolution was poor so I used Inkscape to turn it into a vector. Free, easy to do an very effective. I’ll upload it later.

Did you make your own h-bridge?
I was lazy, used an L293D motor controller IC. It’s a little bit overkill since it’s designed for two motors but I have plenty of them lying around. I’ve yet to make my own h-bridge, in hindsight this would have been a good project to do it on since the motor has little resistance (can’t stall like in a robot application). The transistors were for my range finding, I’ll mention that shortly.

I’m curious about your distance code too
It’s non existant! The range of the method was just not enough 30cm, tops. I should have realised that since I’ve used this style of range sensing in the past.
http://letsmakerobots.com/node/2907
That’s what I was using. I will eventually buy the same IR sensor you were using. Probably in bulk because my robots need to see too! It’s frustrating to have buy them because until now my parts were easily less that £5 but I really want the range sensing speed change as that’s the bit that caught my attention in the first place.

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Jonathan Jamieson

Hypnodisc

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