RFID pet feeder

Step 4 Add auto/manual mode switch and open/close button

You have to be able to open the feeder without a tag, when you want to fill it with food for example. Thus, we add a switch that puts it in 'manual mode' in which the feeder opens by pressing a button. For clarity, the schematic shows only this latest addition without anything else. This can also be tested with the code that can be downloaded over here:
http://www.writtensound.com/arduino/cat_feeder.htm.