I'm new to the forums and Arduinos in general, but for one of my first projects I have been wanting to make an RFID door opener. This is for my dorm room, so I can't modify the door or lock mechanism, so I wanted to have a servo attached to the deadbolt. My first question is whether I can run a bidirectional servo straight from the Arduino pins, or through a transistor or relay if the motor needs a higher current power source. I am not sure if I would need to get an H-bridge or a motor shield kit to accomplish this. (sorry, I'm sure this has been answered somewhere already; if so, just a link would be fine for me)
My second question is in regard to RFID readers. As of now, my choice is between the Parallax serial rfid reader and the ID20. Ideally, this would be mounted (gently duct taped :)) to the inside of my door, which is 2" solid wood, but with thinner inset panels that are about 3/4". I could definitely fit the reader over one of these panels. Is it feasible to have a keychain-type RFID tag be readable through the door, and which reader would be best suited for this application?
I really appreciate any input, I am excited to get going on this once I have the parts I need.