I'm trying to modify a small USB keypad to attach a foot switch to it, that would trigger the enter key.
I disassembled the keypad and figured out which pins I need to contact to make an enter keystroke. It's the 8 and 7 in the image below.
I need to attach wires to these pins (two separate wires, connected to a jack port). Now, I have never ever soldered anything in my life, so I'm not sure what's my best option here.
The 11 soldered pins you see are about 1,5/2mm wide each, so I'm afraid trying to solder there would end up in me soldering two of these pins together.
There is also the other flat areas, but can I solder something there? Will it hold, and will it not melt the board's coating?
Any other options I'd have missed?
Here's the backside of the board, the pins you see on the front come from the black connector in the bottom left.
And, for those interested, here's the contact sheet of the keys: