I intend to make a light switch with a touch pad and RF remote control. As the lighting circuit in my house does not have an earth or neutral connection some cunning is required. I intend to appropriate the circuit from a design explored by BigClive

In this circuit the '0V' rail is a half-wave rectified mains supply voltage so I don't expect that a standard capacitive touch switch would work so I am thinking of a circuit as below and using either a digital uC pin and looking for transitions or possibly using the ADC. The tough pad would be foil or a piece of PCB behind a blanking plate where the original light switch was.

Is this likey to work?
Is there a better way?

 

Is this likey to work?

This is the circuit I setup on my breadboard that functions correctly.
I'm using a Picaxe 08M2 which is a PIC12F1840 with a pre-programmed bootstrap code.
Program Test Code:

 

Thank you. So it looks like I am on the right track then.