I have the Skywriter HAT and the breakout board too.
I recently began to try out these devices a few days ago, but I seem to have some issues.
I made some videos, I linked to them at the bottom. I wrote a quick’n’dirty test program in python to better visualize the data given by the Skywriters. In the videos you can see both the Skywriters, and the output of the test program on my monitor. (The text is readable when 1080p is selected.)
In the text line where the “center” “south” “north” “east” “west” labels are visible the first set shows the number of double taps, the second the taps and the last the touch events.
The HAT works well, however there are some curiosities, for example the Z value only goes to zero at the sides (0:16 on the video) But I guess that could be normal, and maybe it’s because of the internal averaging of raw sensor readings. Also it’s visible at 0:36 that after a touch the tap event fires a few times even after I lifted my finger.
The breakout board shows much more erratic behaviour, I don’t even begin to list them, they can be seen on the videos. Earlier I experienced one more kind of behaviour, that I guess I couldn’t managed to record now: the board consistently detected the touch/tap events 2-3 cm above the board.
I used a Raspberry Pi 3 for the test, but earlier I tried the breakout with an Arduino Nano too, with similar results.
With the Raspberry I use the official Raspberry power supply.
Here is a photo of my soldering.
I think it looks okay, right?
(The blue thingy is just a bunch of layers of electrical tape, since using only the feets that came with the board, it was wiggly on my desk. I needed to apply tape only to this corner.)