Laser Harp with WiiMote

http://www.stephenhobley.com

Finally got the chance to complete the WiiMote extension to the Laser Harp.

The WiiMote front sensor has been modified to track 532nm light, rather than the normal IR.

Software on the PC converts the information from the WiiMote into MIDI controller data - this is merged (using MIDIOX and MIDI-Yoke) with the trigger pulses coming from the harp and fed to the impOSCar synth.

It solved a whole heap of problems I was having with the analog sensor on the harp, at the cost of having to include some software on the PC.

Eventually it should be possible to wire the Arduino MPU in the harp directly into the I2C bus that the PixArt WiiMote sensor is connected to. This would bypass the Bluetooth and PC altogether.

Category:

Science & Technology

Tags:

• Laser
• Harp
• WiiMote
• Jarre
• Arduino

[Ltdog234]

How much does it cost to build a fully functional harp?

[shobley]

About $600 for a basic 250mw one, but adding higher power lasers will increase the cost dramatically.

[raysingermn]

So, do your plans come with the WiiMote code as well? And you can change that to any sound, right? Like hooking it up to a keyboard and such.

[shobley]

I didn't include the source code with the plans - as I hadn't completed them at that time.

I can send the source out if you need it.

It only emits MIDI continuous controller data, no note on/off. This is merged with the note on/off data from the harp.

[shobley]

Yep - but between the Toub MIDI library and the WiiMote library, there was only about a dozen lines of code to write...

[Xsilo993]

I'd like to have the same one :o

[pnapkparkour]

what kind of lazer filter do you use

[wax78]

@lemorlenny I've never released anything until now. Probably will release source or executable soon on my website...

[lemorlenny]

@wax78

Hi, where can I see some details of your project, expecially about the opencv code?

Many thanks.

[wax78]

Made my own too, but slightly different system. A laser line, webcam, opencv, java and voila you got your own midi keyboard harp for 30 $ ;)

[xJessxM]

what causes the sound?

[klocke]

all the beams had the same tone WTF? has potential but needs refinement

[kwelts]

nice JMJ (jean Michel Jarre) action there. Copied is performance with wiimotes.

[Stoney3K]

What's your scan speed on the galvo's? Somewhere around 10kpps with 30 degree opening angle?

I'm a little concerned about the Wiimote's camera picking up the beam scanning and causing flicker. If it proves reliable enough you can drop the entire photodiode altogether.

[Grunzviech]

Hi Shobley,

I would need one Laser Harp for an interactive House Clubbing in Vienna. Can you sell me one? Greets florian