Wire one push button to 2 PCB's simultaneously

Thread Starter

Silvos

Joined Feb 3, 2016
2
Hi All,

I am new here so I shall add a short introduction before I start my question, I am a 27 year old 3d designer from the Netherlands. My interest lies within 3d design but occasionally I have a more technical project, I am some understanding of hardware electronic components and software (like how to operate a Raspberry Pi).

My questions is probably very simple, but I did a lot of effort googling for a solution and I could not find anything about it.
- I have 2PCB's and each has a standard 4-pin push button like shown in the picture below.
2015-Hot-100-Pcs-6-x-6mm-x-9-5mm-font-b-PCB-b-font-Momentary.jpg
- Now I want to push the buttons simultaneously, First I designed a hardware solution using a case with a big button that when pushed reached both PCB push buttons, however this solution does not work very well. So I was wondering if there is any possibility of wiring the connectors of both PCB's to one new push button which activates an action on both PCB's simultaneously. However I think I would at least need a push button with 8 pin connectors, which I cannot find.

Any advice is welcome,
 

dl324

Joined Mar 30, 2015
10,911
I was wondering if there is any possibility of wiring the connectors of both PCB's to one new push button which activates an action on both PCB's simultaneously.
You could wire the existing switches in parallel so pressing either switch would affect both boards simultaneously. A schematic would make feasibility easier to determine.
 

Thread Starter

Silvos

Joined Feb 3, 2016
2
Thanks for your replies,

Unfortunately I do not have schematics, I do have a picture of the PCB in question, I hope this will help,
P6280048.jpg
 

tracecom

Joined Apr 16, 2010
3,944
You should also be advised that the switches in the photos you posted do have four mounting legs, but only two electrical connections per switch.
 

#12

Joined Nov 30, 2010
18,210
If you're working in DC, a couple of diodes can direct the current or voltage from one switch to each board and keep the boards from interacting with each other.
 

AnalogKid

Joined Aug 1, 2013
8,485
The switch in your photo is called a Tact switch because you feel a tactile little thump when the mechanism breaks over to make contact. The switch mechanism is SPST - single pole single throw, the most basic kind of switch. In your kind of application, it usually connects a device input pin to either the positive operating voltage (usally the battery voltage, called Vcc) or the system ground, GND, maybe through a resistor. Without probing around on the board with a voltmeter or scope, it is very difficult to predict what the switch circuit actually is. However:

IF the two boards are identical,
AND IF they are powered by separate batteries,
THEN MAYBE you can get away with wiring the two switched together directly.

ak
 

dl324

Joined Mar 30, 2015
10,911
Unfortunately I do not have schematics, I do have a picture of the PCB in question, I hope this will help,
Doesn't help at all.

You need to trace the circuitry around the switches and create a schematic. If you're lucky, the switches will be switching ground or power and you can have a common ground between the two boards.
 
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