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@Gordon
How exactly are you planning on doing capsense? Using http://www.espruino.com/Reference#l_Puck_capSense ?
If so, that uses an extremely simple software-only approach (using a FOR loop to count up until the voltage hits a logical 1, then down until 0, and so on 100 times). The Puck itself uses a 1MOhm resistor, so I'd just start with that and see if it works ok for you.
To use proper capsense using the hardware you'd have to use the http://www.espruino.com/NRF52LL library - but that should actually be pretty easy using the edge detection stuff there (you're effectively just using the inverter example as-is and adding a counter).