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  1. S

    Detect angle between 2 devices

    I'm hoping you experienced Robot and Laser builders can help me with some brainstorming for a new project. I need to turn a "robot" to face a human. The human could be carrying an iPhone with GPS, ultrasonic sensor, laser reflector, anything small. Within 15-30 degrees would be close enough...
  2. S

    Emerald dust fireflies many twinkling dots DIY?

    BlissLights Spright - Amazon.com What kind of diffraction gratings does this require? 2 of em? Where can I purchase them? Ebay? Cost? Is there another method to generate many 100's of beams from 1? How about just 10 randomly XY spaced dots? Which method is most efficient for power output...


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