Ok, to start off I would like to state that I have absolutely no experience with electronics or components.
I would like to build a very small curcuit that is a "Photosensitive wireless relay" basicaly what I want it to do is, when the sensor is exposed to light I want it to relay a wireless signal to a reciever when exposed to light. I want the reciever to be able to switch an appliance off. The problem is the relay has to be as small as I can get it. The key thing with this component is it has to be very small and descrete, if possible run with those coin batteries that will last quiet a while.
I also don't want to break bank with this project.
Any suggestions as to parts and how to do it would be excellent! Thank you.
Very important project I despritely needs help on.