I am working on making a second iteration of a switchboard I made a while back and am going to use 32 SPST switches to control various elements of air vehicles. All of the switches will control at least a single 5mm L.E.D (Some will control 2), grand total of which is like 34. They will all be going to one of these.http://www.leobodnar.com/shop/index...id=206&zenid=f465c12e9ca0d801532698e4e744b2bd

When linking them together - the 5V power wire - would it be wise to connect them in parallel. Or would the 5volts depreciate as the line continued or not?

In addition to this, Would you guys consider a 470r to high of a resistance for an 2-2.2v 5mm L.E.D, or in some cases 2 L.E.D's to one switch. And while I am at this part it might be pertinent to ask whether it is possible to achieve a Switch off = Red L.E.D off and Green L.E.D On when Switch is flicked on.

 

When linking them together - the 5V power wire - would it be wise to connect them in parallel. Or would the 5volts depreciate as the line continued or not?

This is a partial read:

32 truly independent digital inputs for buttons and switches - No matrix, no diodes and no daisy-chaining. Each input has its own two terminals for GND and button input(GND can also be shared between inputs if necessary)

Looks like each of the button inputs uses a button to ground leading me to believe there is a pull up input which when a button is pressed results in a momentary logic low or a logic low for the duration the button is held or in your case a switch is closed. Also note how a LED is Illuminated on a button push. That scheme could be used to drive a for example D Flip Flop so you could have Red and Green LEDs illuminate depending on switch position. I have not thought that through. Finally if I were me I would likely use the BBI-32 Button Box Interface - With Connectors. It would make for easier connection interface especially the USB interface.

Ron

 

So how would I go about wiring the SPST to give me the desired scenario (Diagram please?).

 

You would wire it using a SPST switch as it is wired in the example I linked to. If you want two LEDs you would add for example a Hex Inverter like a 74HC04 or similar. Closing the switch places B1 low and that line would run to a inverter and another LED configured like the first. That or add a transistor to drive the second LED. Here is an example using a transistor:


This is based on the drawing in the link and just an example of using two LED indicators. You need to determine the LED series resistances for the LEDs you choose. V1 and S1 make up a simulated push button being held for 1 second and off for 2 seconds and repeat. R2 is the internal pull up to the unit and V2 simulates a 5 volt power supply. Q1 can be any cheap switching NPN transistor. The drawing is approximatelt what you could do.

Ron