The schematic currently shows three terminal pads labeled VCC, I/O, and GND, but no nets/wires have been defined yet. So electrically, Flux does not currently show them connected to anything else.
Conceptually on a TTP223 touch module:
- VCC pad → power input, typically 2.0–5.5 V depending on the module/IC version
- GND pad → ground/common reference
- I/O pad → digital touch output signal to your Arduino/MCU input pin
So you would wire it like:
TTP223 VCC → Arduino 5V or 3.3V
TTP223 GND → Arduino GND
TTP223 I/O → Arduino digital input pin
The touch pad electrode itself is not one of those three external pads; it connects internally to the TTP223 sensor input. The three exposed pads are just the power and output interface.