I see the CTSU noted in the datasheet for both the Minima and the Wifi, but I don't see any documentation about what pins are used, nor any examples of that capability in action.
Am I missing something?
Thanks
more is promised on youtube
trevor makes
Very impressive work! I recommend anyone interested in this topic to watch the video.
On reading about that Easter egg, I found another: you can put emoji in your strings and Serial Monitor will display them! 
I'm glad you liked my video!
I spent a few days trying to figure out the CTSU and didn't get anywhere with it. There are two approaches I looked into: setting the registers by hand (there are a lot and you also have to deal with GPIO, timers, and the data transfer controller), and using the FSP API with the Renesas QE software on Windows (extra FSP source files available here). It also seems that you need an external capacitor (how many Farads???) on the TSCAP pin P112 (D10 on Minima, D7 on WiFi). Hopefully someone can figure this out and release a nice library for it!
Also, it was pointed out to me that there's a bunch of research work on measuring heart rate with capacitive touch, so there may be more code tucked away in the Arduino core that I haven't found yet.