VWvan, In your diagram of the sofa bed micro-switches and diodes you explain that the current is flowing with the arrow in the diode symbol. It is my understand that the only thing that is moving inside a wire of a completed and powered electric circuit, is electrons. In an electrified circuit electrons will flow from the negative power terminal through the completed circuit to the positive terminal (unlike charges are attracted) which means they would be flowing against the arrow in your diode symbol. Is not current flow - electron flow?