Hello, I'm trying to use TTP223 touch buttons touch button . I placed them (3) on a PCF8574 inputs. [image] They work fine on the breakout board but don't work on the PCB, because the signal voltage doesn't drop low enough (about 2.5 to 3v instead of ~0). Then it doesn't trigger the I2C controll…

Capacitive Touch Button not working on pcb

DrDiettrich October 5, 2021, 9:04am 2

Which breakout board? Circuit diagram?

How do you power the circuits?