How To wire up your Big Dome Button

The Problem

Many customers have emailed us on the proper way to wire up their Big Dome Buttons.

Wiring is pretty simple as illustrated by the image below.

Big Dome Button Circuit

The Explanation

Firstly to explain, there are 5 connections for this circuit. Two connectors (the brass colored tabs) are for the light. There are 3 connectors on the white switch, one at the bottom is the common (COM) and the other two are normally open (NO) and normally closed (NC).

Wiring up is dependent on how you want the switch to operate. Do you want it to do perform an action when depressed (this is called normally open or NO) or do you want it to stop perform an action when depressed (this is called normally closed or NC).

The Solution

If you want to light to illuminate when the switch is depressed you will wire it for NO operation as follows:

Take the negative wire from your power supply and connect it to one of the tabs of the light holder. Take the positive(hot) wire from you power supply and connect it to the COM tab of the switch. Then connect a wire from the NO tab on the right hand side of the switch to the other tab of the light holder (long red line on image).

If you want the light to be illuminated always and to switch off when the button is pressed wire it for NC operation as follows:

Take the negative wire from your power supply and connect it to one of the tabs of the light holder. Take the positive(hot)  wire from you power supply and connect it to the COM tab of the switch. Then connect a wire from the NC tab on the right hand side of the switch to the other tab of the light holder (green dotted line on image).

This should get you going with your project.

 

{ 3 comments… add one }
  • Dusitn October 29, 2015, 5:27 pm

    So can I hook this straight to a 12 volt car battery or should I place a resistor between the two. Is there a resistor already in the button?

    Reply
    • gkarlsson November 13, 2015, 2:17 pm

      you should be able to do that – it already has a resistor.

      Reply
  • Justin May 29, 2016, 10:34 am

    Thanks for the diagram! My button works great.

    Reply

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