[BUILD LOG] - First DIY Build - Numpad Mod

[Bunford]

If it's right (and I'm hoping MiL0 or extraclassic could check please ), then I know where to wire the arcade buttons to and which arcade buttons will be where.

One thing I need to check though. If 1-3 are unused by the original numpad (as it seems from my understanding), can I then use them or are they not recognised by the brain?

[MiL0]

the next step is re-creating the circuit using wires and buttons!

according to your chart above, connecting a button via two wires to terminals 7 & 8 will replicate the 'Enter' key, for example (edit: oops, bad example as Enter actually uses three terminals... you get the point though)

Looks like most of the terminals have 4-6 wires connected to them... so you could daisychain wires by following the chart. This would mean that you only need to connect one wire to each terminal, and then daisychain (solder more than one wire to a terminal) the rest of the wires.

gah, it's hard to explain properly... hope it makes sense!

edit: terminals 1-3 are unused by the numpad... its unlikely that they would do anything if wired up... doesn't hurt to try though does it!

[Archies'bald]

I thought using a keyboard was more complicated than it is. Thanks for the explanation guys.

[VirtualLogic]

i think your chart is right, it just make a map on paper of where wires need to go. a circuit diagram if you like

[Bunford]

I thought using a keyboard was more complicated than it is. Thanks for the explanation guys.

No probs. It was my intention with this thread to show how someone can get from knowing nothing to having a mod controller. Will be posting step-by-step photos/logs as it goes along too.

Going away with work for a few days today though, and waiting on parts deliveries from eBay, so might take a couple of weeks to get there.

[Bunford]

the next step is re-creating the circuit using wires and buttons!

according to your chart above, connecting a button via two wires to terminals 7 & 8 will replicate the 'Enter' key, for example (edit: oops, bad example as Enter actually uses three terminals... you get the point though)

Looks like most of the terminals have 4-6 wires connected to them... so you could daisychain wires by following the chart. This would mean that you only need to connect one wire to each terminal, and then daisychain (solder more than one wire to a terminal) the rest of the wires.

gah, it's hard to explain properly... hope it makes sense!

edit: terminals 1-3 are unused by the numpad... its unlikely that they would do anything if wired up... doesn't hurt to try though does it!

I get what you mean. So the + wire goes from terminal 4 to all the buttons that use for by going to + on first button, then wire from same + on that button to the next button using terminal 4 and so on.

However, all use 2 terminals, and a couple use 3 obviously. so that mean some of the arcade buttons will have 2 wires soldered onto the + (one to daisy chained onto next button in terminal, and one daisy chained in from button on another terminal). Does this sound right?

[Bunford]

i think your chart is right, it just make a map on paper of where wires need to go. a circuit diagram if you like

That's the plan. Here's a rough sketch of a diagram, where they are all connected to the + terminals on each arcade button. Does this look right?

Where would the wiring from the other terminal on the arcade buttons go?

[kooper1980]

I get it now. Daisy chaining sounded complicated but it all makes sense. I love this thread!!!!

So do you have to daisy chain the - terminals on each arcade button the same way as you do the + terminals?

Where are you getting your arcade buttons from?

[MiL0]

Hmmm I think you get the general idea but i can see a couple of possible mistakes... don't forget each button needs at least 2 wires connected to it... The ". Del" button only has 1 wire.

Also I'm not quite sure how the daisy chaining will work when you start to attach more than one cable onto each terminal of a button. Your wiring diagram doesn't show which terminal each wire is attached to on a button. This matters! Otherwise, if u get it wrong, the circuit will be completed even when the button isn't pressed.

Going back to your original excel chart, I think the best way to approach this is to make sure that all the wires on column one (the top plastic sheet) are soldered to the + terminal on the arcade button and all the wires on column two are soldered to the - terminal.

You basically want to avoid creating completed circuits when no button is pressed down. Hope that makes sense!

[MiL0]

This is what I've worked out from your Excel chart:



key: green wires get soldered to one terminal on the arcade button, red wires get soldered to the other terminal.

Basically, it looks alright to me but obviously I haven't checked it against the actual plastic sheet circuits so there might be some mistakes.

Actually, I can see one already - look at your chart and check out "Del" and "2" - they both share the same circuit which doesn't look right to me...