Hie!
I am trying to build an interactive poster using Bare Conductive Ink and CapacitiveSensor Library. Random sound is generated when certain spots on the poster are touched. Unfortunately I am having some problems.
The poster works when Arduino is powered by USB but it doesn't work when I connect a 9V battery.
I guess the issue is with grounding. Does anyone have idea about where I am doing wrong ? Please help.
Thank You.
-Sam
I guess the issue is with grounding.
Yes I think that is a good guess.
Capacitive sensors work by measuring how much capacitance there is between you and the system. I would try and put an adhesive copper strip or even a conducting paint line round the perimeter of the back of the poster and connect it to the arduino ground.