Laser. Gun. Strange Request

Discussion in 'General Chat' started by Member 328449, Apr 13, 2016.

  1. Member 328449

    Member 328449
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    I'm trying to figure out how to make a device which has a laser gun and a target. When the laser hits the target it changes the message on a connected screen. Anyone smart enough to work out how this could be done as I am not!
     
  2. MrSossidge

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    Ooh, could you repurpose a Tin Can Alley with an arduino or a Raspbery Pi and some wires and some crocodile clips?
     
  3. Member 328449

    Member 328449
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    That's the sort of thing I was thinking of to be honest. No idea how I'd make it though.
     
  4. E-com

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    i imagine a simple light sensor input might work. if they work the way i think, it would record light levels, and as such you could just set a threshold in software to trigger from. this might get the result you need?
     
  5. balidey

    balidey
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    I think most photo sensors would be switched on by the ambient light.
    I think a laser would trigger one, but I think it would need to be shrouded or partially hidden from most light, then a well placed laser hit would close the circuit.
    I seem to remember there were some electronics kits on ebay a while ago that were 'GPRS switches' but when you looked at them it was a photo sensor that you place in front of a mobile phone screen, then when you ring the phone the screen comes on and turns on the device.
    I would start with one of those and adapt it.
    Can't look for them right now as work don't like us using ebay.
     
  6. balidey

    balidey
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    Or one of these kits as a starting point?
    Google: velleman mk125
     
  7. noiseboy72

    noiseboy72
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    We use a virtual spray wall - where you "paint" on a screen using spray cans that emit a UV laser beam.

    Behind the screen is a UV camera, which once calibrated can read the exact position of the laser. Works up to about 15M from the sensor.

    About £600 for the sensor and software, so maybe a bit expensive for this application?
     

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