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Help with very basic switch circuit for skydiving!

Discussion in 'General Electronics Discussion' started by MrMagica, Nov 14, 2015.

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  1. MrMagica


    Nov 14, 2015
    Hi all, I have almost no knowledge of electronics - googled for this forum! I can just about solder and I know what I want to achieve! Ok two questions:

    I am a skydiver, starting to work a camera man next year, and building my helmet fitted with a stills SLR camera. I had an idea to use a shutter release cable, rewired to an ON - OFF switch button. So I would press the button once to connect the contacts and the shutter is triggered taking a shot every 0.5 seconds until I next push the button to break the circuit.

    Problem one : On searching the WHOLE of the internet I cannot find an ON / OFF button that would suit - they ALL are a panel fit type with exposed connectors on the rear, sticking out at least an inch. This would'nt be great should the helmet impact my head! So I need quite a flat surface mount button, or one than is enclosed and fitted on the inside - any suggestions? I am in the UK.

    The best I could find was this from Judco. Good but its 3cm tall and would stick out too far:

    The second question - falling at 200mph I may not know if the camera shutter is engaged or not by sound alone - it would be fantastic if I could run an LED to show if the camera is shooting or not. I looked at a pin readout from the camera USB port, and one did supply 3v - however I'm really not sure how to make use of this. It might be easier to take the power from a seperate very small battery to power an LED (I guess it would last forever), but I do not know how to even do something this simple, If I wired the batter and LED straight intop the switch I guess it would send the current down into the cameras USB!

    Not sure if that's clear.



    Olympus E-PL5 with a UC1 USB Port

    Pin Read Out (I think!!):

    1 - USB DATA +
    2 - USB DATA -
    3 - Shutter Release (when combined with 11)
    4 - Audio - Center (?)
    5 - Video Center
    6 -
    7 - Video Shield
    8 -
    9 - Audio Shield
    10 - USB -ve
    11 - Auto Focus, Meter (half press of shutter release button)
    12 - USB +5ve
    Shell - Ground, USB ground

    Now here is a lead a friend has with the right kind of button, and a built in LED / fiberoptic indicator. However it is a smart switch designed for use with Sony camcorders, but it gives the idea....


  2. Bluejets


    Oct 5, 2014
    You could make a "touch switch" from a piece of veroboard using 2 strips for the contact. (maybe 1mm thick)
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