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That sounds pretty good, i'll definitely take a look at that shield, thanks

Wow that's pretty cool, the tutorial i used used a midi jack but i couldnt get the serial communication with the keyboard to function properly. Does it sound really artificial or does it have realistic synth like sounds?

This IR sensor Arduino Sharp Gp2y0a21 Ir Infrared Range Sensor + Cable New: Amazon.com: Industrial & Scientific says it has an angle of >40 degrees, which may be doable for a few beams but when you're talking 12 individual ones thats kind of a stretch. My only concern with using light intensity...

*well, sorry I was typing that on my phone.

True, i dont know what the divergance is on those sonar modules, maybe you could hook up another mirror to split the IR beam but since you cant see it it might be hard to adjust, and the sensor may not read it as sell

I think the best way to have a variable pitch would be using a sonar range finder like these Amazon.com: SainSmart HC-SR04 Ranging Detector Mod Distance Sensor (Blue): Car Electronics, they're pretty accurate and responsive and since they're already optimized for arduino it should be alot easier...

I think they normally use an external fog machine but ive never actually seen one so i dont really know

I dunno if anyone's still gonna see this thread but I figured i'd point out just for anyone trying to figure this out that the schematic for the project actually uses a transistor to turn the laser off and on, so any laser will work as long as you connect the laser to the arduino via the...

Ok thanks, i'll see if anyone's willing to part with their lab for something I can afford, i'll probably just have to go for a lower wattage

You guys are right, the code has the laser turn on and off for each step of the motor, are you sure that that can't be done with just a handheld laser though? He never says you need TTL and he even uses a handheld laser in most of the pictures.

Haha not exactly, I just figured that since the stepper motor stays on the steps for longer it would reflect alot more light at those specific intervals and not so much in between them, there'd still be light reflected in between them but because it's not reflecting as much light as the steps...

But isn't that why i'm using a stepper motor? The speed of the motor in between each step should ensure that you don't perceive the laser in between each step, and due to persistence of vision you only see the beam at those specific steps. I haven't looked the code over thoroughly enough to see...

If you'd be willing to let it go for cheap enough i'd probably be willing to buy it but i've got a pretty limited budget so I don't think I can offer you a fair price for it

I think a LAB laser is more than I really need, thanks for offering though

Yeah, it's just for my own amusement so it doesn't really matter that much, if it gets to be a problem I may be able to just take it apart and replace the pushbutton with a toggle switch, i'll keep my eye out for one that already has it though.

That would be nice but I figure if its easier to get a pushbutton one i'll just tape the button down

I don't think the laser needs to turn on and off at high speeds, the idea is the beam is continuous but when you place your hand over it the photoresistor will read it and tell the processor at what stage of the stepper motor the signal was read, the stepper motor is creating the split beam...

I probably just don't know what i'm talking about but why does it need TTL or analogue modulation, can't any laser interact with the arduino and photoresistor?

Phew, glad I came here first, thanks for your help!

Thanks for the help, that seems pretty doable. Is laserpointerus.com reliable? It seems most of their lasers are under priced and that usually means they're ripoffs.