capacitive sensor switching a relay with a time delay

Using Arduino Project Guidance
1

Hi all
Im very much new to the arduino world. I have an electrical/ electronics back ground but the programming Im still wrapping my head around. I am trying to create a touch sensor for a light with time delay

Im using the Uno and Ive been able to set up and program my arduino to toggle switch a relay with help from The capacitiveSensor library but I haven't been able add the relay to switch momentary.

Seen here Arduino Playground - CapacitiveSensor

My question is
how can I program my relay to turn on via to cap sense then power off with a time delay?
and how large can I make the conductive surface area to activate to system?

Any help would be greatly appreciated

Thanks guys

2

Since the system itself is a hackjob, you'll need to play around yourself and see how large you can make the surface. There's no spec to refer to or anything.

As for making it turn a relay off after a time delay, just record gettime() in a global variable when the button is pressed, and every time loop() runs, check to see if it's time to turn off the relay. See the blink-without-delay examples for an demo of that concept