Published by OneSwitch.org.uk Tuesday, 21 March 2017 10:16 pm.
Above is a pin-out guide for the third party Playstation 4 controller the "Armor 3". It's very easy to adapt for switch access. Removing the joysticks though is difficult (desoldering braid essential, plastic levering tools and patience). The sticks are also unusual in design, with very wide compressed springs. Click the small PCB image above for a big view.
D-PAD: 1 = GND, 2 = LEFT, 3 = UP, 4 = DOWN, 5 = RIGHT, 6 = SHARE.
SHAPES: 1 = GND [SAME AS D-PAD GND], 2 = OPTIONS/START, 3 = PS, 4 = CROSS, 5 = SQUARE, 6 = TRIANGLE, 7 = CIRCLE, 8 = vdd [R2 GND]
T9 = L1 and T11 = R1 (use shared ground point).
T19 + T28 = L2
T29 + vdd = R2