I'm using the AD7147 as a force sensor, connected to the evaluation board right now. I have two metal pads on my board that I have placed a square of silicone rubber on to act as a dielectric, with an aluminum square on top connected to ground to act as the other plate in the capacitor. I am having issues though because even though I have connected the top plate to ground, the capacitance values change whenever my hand gets close to the sensor. I'll attach a schematic of my board below, this board is simply connecting to the edge connector of the evaluation board.
Does anyone know how I can isolate or stabilize (not sure I'm using the proper wording here) my sensors so they are unaffected by the environment around them?