I tried the capacitive touch using library available in this website and its working perfectly.
Since my pcb requires 5 switches of same type i added it.
Now the issue is when i covered 2.5mm thickness sheet on pcb ...the capacitive touch isn't working at all
i have used 10Mohm resistor without the capacitor at the touch side terminal of the 10Mohm resistor.
but when i remove the 2.5mm thickness and touch using bare fingers its working.!!!
can anyone tell me how to resolve this issue?
please its very much required.
Rakshith_KR:
but when i remove the 2.5mm thickness and touch using bare fingers its working.!!!
Well, there you have your answer - that is, assuming your unspecified sheet is of non-conductive material.
It seems your sensors are not sensitive enough to detect proximity, but require touch.
Possible solutions:
increase the sensitivity of your sensors (software and/or hardware wise - can't give suggestions as you didn't tell anything about the sensors themselves, nor the software that reads them),
create a conductor from the top of the sheet to the sensor below it.
You need 2 plates for every capacitive sensor, one connected to Gnd, and one connected to the I/O pins. Else you risk to activate multiple sensors at the same time, poor sensitivity and random behaviour of the sensors.
You can surround and separate every sensor by a common Gnd plane on the PCB. Turn the copper side towards the operator, and cover it by thinner material.