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I have two different buttons B3F-1000 and 3a250vac switch which i want to integrate into a lego "machine" which i'm powering with an arduino. Since the rest is integrated into lego plates, i also want the same for buttons, which means they need to be covered in lego, but still fit with the rest, which means no glue.

Looking for suggestions on how to attach lego parts in a way so the user pushes a lego part and it is registered by the button. Its a very tiny range of press, so it doesnt need to move much in the press, and its not a toggle button, which means every press will feel the same.

Picture with two common parts for scale.

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  • Are you wanting to place the buttons inside of the bricks, or just be able to stack them with other Lego parts? – Matthew Jensen Sep 3 '20 at 1:29
  • @MatthewJensen they should just be stacked, as a part of the build, not inside. – bogen Sep 3 '20 at 6:29
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    Are you willing to drill, glue or otherwise irrevocably alter your bricks? What are the size constraints of the solution? How stable must it be? – zovits Sep 8 '20 at 10:32
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For the first switch I bent the legs of the button and splayed them out just a little bit.

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Next I stripped off the caps of two Dupont connectors, ran them through the headlight bricks and connected the button upside down.

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An axle will trigger the button. Either one with a stud on one end (and a 1x1 tile) or a regular one with a half bush.

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A 2x2 brick on top serves as a button.

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The second switch is a hacked light brick. They're very inexpensive on bricklink.

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I took out the batteries and the LED (they're not soldered as they're meant to come apart) and replaced the one on the right with a metal contact.

For that I took a paper fastener, cut off one of its legs and bent it in an e shape.

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  • Solution with hacked light brick is just great combination of non-destructive use of LEGO with 3rd party elements. – Alex Sep 14 '20 at 14:06
  • This is amazing! Thanks – bogen Sep 15 '20 at 9:09

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