Created a 3x3 matrix from red capacitive TTP223 sensors. I supply 5V power and some buttons work without pressing. One by one, everything works fine, but phantom alarms appear in the matrix. The contacts are insulated, they do not intersect anywhere. What could be the reason?
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Have a look at this instructable
Notice the earth plain around the touch button and keep all the connections to the capacitors short and have fixed unchanging touchpad setup and tune for it.
I assume you have the datasheet
You can increase the Cs capacitor on the touch pad to reduce sensitivity.
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