I am planning to for an Arduino to read status of a switch, and accordingly switch on and off AC appliance, for a demo purpose. I want to add a feature to it of easy recovery to manual switch control.
First circuit to the left is when Arduino reads status of switch, and controls a bulb by digital pin P2 which drives SSR/relay. Circuit on the right is normal switch board controlled light bulb.
So basically what I am trying is: when I remove Arduino board, my previous control (light bulb controlled only through switch) should be regained. Really stuck on this, help will be highly appreciated :)