A Laser Xylophone created at the Laser Music Hackathon at RWTH Aachen University in May 2018.
Väλine Kaksi was ideated, designed and constructed by these creative folks:
Following is the material needed to build the Väλine Kaksi.
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Casing build with Laser Cutter (svg files in repo)
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Arduino Uno (Any Arduino/Microcontroller will do the job)
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Laser Red Dot: 5V 650nm 5mW
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Photodiode: SFH 203 (+ 10 kOhm resistor)
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Speaker Miniatur: 0.5W 66mm Diameter
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4 10mm mechanical springs