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

TomGeorge October 6, 2021, 1:27pm 7

Hi,
Can you post pictures of how you have mounted the switches and your PCB?

Thanks.. Tom...