ref
boards
https://www.electrodragon.com/product/touch-pads-variable-14816-pins/
touch chips
TP223
TP224
BS814A-1 MSOP-10 4-button capacitive touch detection chip
https://www.electrodragon.com/product/touch-pads-variable-14816-pins/
TP223
TP224
BS814A-1 MSOP-10 4-button capacitive touch detection chip