Laser show for poor man

Here's another useless but cool looking "must build" gadget for every romantic geek.
Let me introduce PIC microcontroller based three axis laser spirograph.

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Check link below if you want to see more patterns
Laser patterns gallery
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Step 1 Gathering stuff

Design is quite simple and employs regular parts and components but you are free to change/modify it in way you like.

At first prototype I used blank DVD as reflective material but later I discovered more practical way. Technology of making FS mirror is described in my article
DIY Front Surface Mirror

Originally I'm very lazy man so I've chosen programmed microcontroller PIC18F1220 (can be replaced with PIC18F1320) to handle routine job.

PIC implements 3 channels PWM generator.
Actually it's the same engine as one I used in my IKEA light project just code is adopted for PIC18.

PWM signal toggles MOSFET transistor 2N7000 (Id 200mA). Mirror actuator is connected as load to MOSFET.
As mirror actuator I used 5V 200mA CPU cooling fan. It's easy to mount mirror on its flat side.
Device accepts 5V and 12V fan with maximum current 200mA . Voltage is selected by jumper.

Green laser pointer is rated at 3V so I've made LM317-based voltage regulator with adjustable output.

Cheap 5mW green laser module:
http://www.dealextreme.com/details.dx/sku.10094~r.32746761

What else will you need?
Dozen of resistors and capacitors, potentiometers, toggle switch, power jack, prototyping board, box of proper size and power supply unit.

Comments

[bbsbb]

Nice Job.
Could you also send me the BOM for the parts? How much will it be if I buy them from you?
Thanks

[AP Digital light]

PM has been sent.

[cmcgann]

I know that it has been a long time since you posted this, but could you also send me a list of prices for the parts and the preprogrammed PIC or an unassembled kit?

[AP Digital light]

I sent you PM.

[mirogajdzik]

That is great !

[Djandco]

Self cooling too!
Bonus!

[Kitty2011]

great picturer, have you got other colour graphic, such as blue or red?

[tautius]

Does anyone have made one of these on an Atmel microcontroller?

[onezhou]

i seriously want do one as same as yours ,but my patterns are very simple and ugly, i don't know how to solve my problems,would you like give me the nuclear advicethank you very very much.

[AP Digital light]

In this project I've implemented some rules that should provide random pattern generation and smooth transition.

1. All three fan should never run at the same speed or change speed at the same rate. Usually one or two fans are set for low/moderate speed and one is set for high speed. Human eyes cannot distinguish fast changing patterns so best results can be achieved only with regular low speed fans. On a lowest setting controller can maintain fan speed as low as 60 RPM.

2. If one fan or two are accelerating third one should decelerate.

3. Gradual speed increasing/decreasing. It may take 10 -15 sec for fan to accelerate from 0 to 100% speed.

4. One or two fans may stop spinning and take short brake for 5 -10 seconds.

[onezhou]

thank you !

[rhans]

Hello, you would pass me the schematic image of what you did when you made this PCI: http://www.instructables.com/image/F3ENCQ6FCZERBZZ/Brain.jpg
If you are willing to pass me, this is my email: [e-mail]

[AP Digital light]

PCB in PDF format is in archive pmls(MAR10).zip
Just download, unzip and print in 1:1 scale.

[mjaffe]

Mine was a speaker, wrapped with a balloon with a front surface mirror siliconed on... amazing.

[NE patsrock]

it isnt really for a poor man and i cant even make it

[williamyjk]

Can you please send me separate pricing for:

1) a programmed PIC
2) circuit board only
3) full, un-assembled kit

Thank you.

[AP Digital light]

PM has been sent.

[l19bal]

Hi could you also send me separate pricing for:

1) programmed PIC
2) PCB Board
3) full un-assembled kit

Thank you.

[AP Digital light]

PM has been sent.

[johnston1991]

hi,  could i have a price for the pre-programmed pic please

many thanks

[AP Digital light]

PM has been sent.

[macnomad84]

How easy are these enclosures to drill?

[AP Digital light]

Hammond box is made from PVC plastic. It's a soft material and it's very easy to work with.

[effste]

i want to make a laser show that analizes 3 frequency and depending on the frequency there will be a different colour of laser.. for example if the frequency of the sound right now is from 0Hz to 300Hz than the laser which is producing the light will be red. If it is from 300Hz to 5KHz the laser which is producing the light will be green and if the frequency is higher than the light will be blue. I will use matlab to generate different frequencies and dump them into the microcontroller. Any ideas on how to do this?

[macnomad84]

analogue vu meter basically...

microphone -->LM386--> 3x Hi-Q BPFs

Each output would swing between 0-5 V depending on the signal strength in each frequency "bin" made by the BPFs.

Could run each signal into a threshold detector/comparator circuit to turn the lasers on/off.

[bpark1000]

You will need an RGB laser set, with each one analog controllable. The 3 lasers are combined onto one beam with dichroic mirrors. You could have a computer looking at the music frequency output, and using a look-up table to drive the lasers.

[Treknology]

The reply is very simple, "color organs" are used at discos and clubs. You just need one shrunk down to power your lasers without burning them out. If you want to be really smart, direct the three lasers through a prism so that they combine to form white light and then throw that on the mirrors, as your music changes the density of each primary color, the output of your display will change accordingly. (If been thinking of this for a raster-scan laster projector.)

[AP Digital light]

You can do it even without microcontroller.
Check schematics of color organs.
Usually it includes three band-pass audio filters.
Output signal of each filter can be conditioned and used to drive TTL input of corresponding laser.

[effste]

but how will i input a song if i don't have a microcontroller?

[AP Digital light]

There are different approaches to accomplish the same task.
You can build analog version including audio preamp and band-pass filters or microcontroller-based digital version.

PIC with ADC input can be used to perform signal filtering.
Here's few examples

http://mondo-technology.com/organ.html
http://www.horrorseek.com/home/halloween/wolfstone/ColorOrgans/clomak_MakingColorOrgan.html

[pbergeronronronron]

could i replace the whole pic circuit with three of this circuit? http://www.instructables.com/image/FGH9VJOFHTAIQK6/Part-List.jpg

[macnomad84]

neat.. don't have any PICs lying around, but think i may whip up a manual PWM w/ this circuit for shiiiiizles

[AP Digital light]

Yes. PIC is a solution for lazy man since it generates random pattern automatically. You can make manual spirograph with 3 or more mirrors using any pwm circuit. At first build one prototype and test it with your fan.

[vishalapar]

This is really cool! I am going to make one for myself!

[pbergeronronronron]

i just thought of something else to use as mirror!

as simple as a hard drive platter!! it has no imperfections!
im going to try this as soon as i find a scrap hard drive

[hollowpoint]

would it be possible to use mirror tint for the mirror rather then an actual mirror?

[AP Digital light]

You can try any available reflective material and if it works share your experience.

[coolo52]

this is a very neat spirograph i probably wont make it though

[shnyfher]

Hi can i get a pcb board and the microcontroller from you?

[AP Digital light]

Yes. I sent you PM.