TLDR: what’s the easiest way to use the pads on the front of the protoboard to create traces? I think I should be able to just join up the pads on the front of the protoboard and create a trace through to each button, but what’s the best way? I’ve tried:
- solder paste: once it melts surface tension pulls it up onto the separate pads
- regular solder: the same thing happens, unless I put a heap on, and then it’s a bit higher than I’d like
Would conductive paint do the trick? Something else? Do something to the board to get the solder to stick?
What I’m making it a board to add some 3 buttons and a https://core-electronics.com.au/neopixel-mini-3535-rgb-leds-w-integrated-driver-chip-black-pack-of-10.html to the Pimoroni Inky pHat | Core Electronics Australia, for details on where where I’m coming from see here: GitHub - baralong/inky-gadget: Scripts etc for the pi zero with inkyPhat
I’ve cut a board to replace the black plastic bit in this:
It’s all pretty flush so the protobaord is sandwitched bwtween the case and the PHAT, I’ll be putting kapton tape on both sides just to be safe. That also means I’m trying to keep things fairly low profile. The buttons and pixel fit to the left of the PHAT as the case is wider than the PHAT
Based on Inky pHAT at Raspberry Pi GPIO Pinout I’m connecting the neopixel to pins 1 & 7, then the bottons to 27, 29 & 31. One of the handy ground pins will connect to the ground pour (saving me from having to connect to multipl grounds or crossing the traces.
I’ve managed to attatch the neopixel to 3 pads on a board (I don’t need data out) using solder paste and hot air (much trial and error as it’s my first go with SMT), but it covers the pads completely so I can’t drive it yet.