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Isolating Capacitive Sensor AD7147

Question asked by Dave_Tripp on Jul 12, 2016
Latest reply on Jul 26, 2016 by Maurice


Hi,

 

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?

 

Thanks, Dave

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