I’m joining the split keyboard group by building a piantor. I have the pcbs already and they’re lead free coated and I will use lead free solder on the components.

I’m a bit worried though as I used a borrowed split and I noticed I keep touching the soldering in the microcontroller quite a bit and the build I was going for was a bare one where we just put rubber feet directly in the pcb so there’s no case or anything.

I tend to rub my eyes and bite my nails quite a bit during the day. I was wondering if it’s safe enough on lead free solder or if this is something I should completely avoid.

Any suggestions in case I should avoid it entirely. I reckon the worst place would be the top of the pcb maybe I can use some hot glue where the solder is but I have no idea if it’s hard to pull it off later if I need to review/resolder.

This is my first project and I haven’t done anything like this before, so even the flux I’m kind of unaware how to clean, solder comes with it right, do I need to wipe it somehow or use isopropyl alcohol and wipe with maybe a paper towel?

Sorry about being a complete noob. I searched around but most people are concerned about the lead solder not lead free like me.

  • @nezbyte
    7•6 months ago

    You can put clear finger nail polish over the pins you are afraid of touching. The higher quality polish, the longer it will last. If you ever need to rework it then the soldering iron will burn through the polish and create extra smoke. Conformal coating is what the industry uses to protect boards from chemicals and moisture, but is more expensive and harder to rework.

    Flux comes in many varieties. Rosin or No-clean are most likely what you have. Rosin should be cleaned off with rubbing alcohol and a toothbrush if you want the board to last decades. No-clean can stay on the board, but can also be cleaned off in the same manner. If you have water-soluble flux then you must clean the board thoroughly with water to prevent future damage from the aggressive flux.

      • @nezbyte
        6•6 months ago

        The description says “resin core” which is a misspelling of rosin core. It is just pine tree sap that can be cleaned off if you want with alcohol with a toothbrush and then wiped with something absorbent so it doesn’t evaporate on the board and leave a haze.

        Tin, copper, and rosin sound pretty safe to me but I’m no doctor. Just try and avoid any fumes from the resin while soldering.

        https://en.wikipedia.org/wiki/Rosin