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Topic: Help wiring a momentary push switch to 3 pin computer mouse button (Read 4 times) previous topic - next topic


Hey guys! I need a bit of help with the right steps to wire my logictech mouse... which I modified. (removed buttons , re-soldered new pins and attached wire) However... there are 3 pins for each button, and 3 buttons in total as you can see from the picture. The extra button is under the LEFT click. My SPST momentary switch has 4 pins sticking out of it... I'm slightly confused as how to wire the "three wires" to this button. Seeing as the wires are probably, positive, negative and ground. However I don't know the order of the positive/negative on the switch... or on the mouse :(. Ground can be shared but once again I'm not sure how to go about this.
Please help... I'm new at this. Thank youuu!


The 'microswitch' style button switches in the mouse are probably double-throw,  One pin is common, one is normally closed (NC) and one is normally open (NO).   Probably uses the Normaly Open side and leaves the NC terminal unconnected (check the circuit board).

The NO button you have has two pairs of pins.  The switch connects one pin to another.  Having four pins has several advantages including making for a more stable support when soldered onto a board and doubling as two jumpers which may make it possible to use a single-sided board without additional jumpers.

Hope that helps.  Let me know if I can help with anything\ else.
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thank you very much :) that's very informative.

mainly at the moment... i'm simply trying to figure out which wires to solder to the switch..this might sound like a dumb question but.. i soldered 2 out of the 3 wires to the button. if i plug it into my usb will i short circuit anything or mess up my laptop? probably not since the power is very low. just to test it out.


Nevermind.. I tried. Luckily nothing happened. Button doesn't work. I'll go out tomorrow and buy another mouse model... hopefully it will have two pins to make this mouse hack easier.


I'll go out tomorrow and buy another mouse model.

You'd be a lot better off buying a multi-meter, instead. Quit guessing. Know.

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