Driven shield for touch sensors
Posted: Thu Mar 19, 2020 4:58 pm
I'm working on a product development using a touch wheel based on the ESP32 touch sensors. The ESP32 is very close behind the touch wheel and the grounded meta cover is messing with the sensitivity. I could design in a driven shield plane between the touch sensors and the ESP32 metal case but don't know where I can take an active signal from to use as the shield. I'm assuming a copy of the touch waveform would limit the effects of parasitic capacitance.
Does anyone have an idea where I can pick up a isolated waveform from the ESP32 matching the touch sensing waveform to uncouple the sensors from the ESP32 ground plane.
Thank you.
Does anyone have an idea where I can pick up a isolated waveform from the ESP32 matching the touch sensing waveform to uncouple the sensors from the ESP32 ground plane.
Thank you.