I recently got this hat screen for my B+. It has headers to use the GPIO pins that aren't used for the screen. The screen works well, but I want to make use of the other GPIO pins. The only problem with it is I can't seem to find a ground that works. As you need a ground for pretty much anything, this is a pretty big set back. It does work if I touch the ground to an actual ground pin solder point, but this isn't really feasible with the screen on. Anyone have experience with this?
- Instead of soldering on the supplied 2x20 female header, you get a stackable header like this one and solder this on. Now you have all 40 pins available, and you can pick your ground. Just make sure your other boards don't use any of the non-GND pins used by the display.
- If you don't mind soldering a wire on, you could solder a wire onto one of the GND pins exposed on the solder joints for the existing 2x20 header, and then use the exposed breakout of available pins for your other device, and the wire for ground. This would save you having to desolder the 2x20 header that came with the kit and you probably already soldered on.
Finally - the board seems to have 3 pins directly exposed (labeled #4, #5 and #6). Pin 6 on the Pi is GND - you could try to connect your ground there after first confirming with a multimeter that that pin is indeed ground.