I would like to make a sensor of some sort that will only operate the handicap door switch if the person holding some type of sending unit comes in proximity of the switch, but that they would not have to push a button. It should open only for them and only when it comes within 3 feet or so of the door. Is this possible? I have seen the switch that operates the handicap door and am including a photo. I'm guessing what I make would temporarily bridge the circuit (bypassing the already-installed switch) to engage the door's actuator. What would I need to make something like this? Here is a photo of the switch on the wall. I'm thinking my switch would just connect to the pigtails to complete the circuit when activated. If it helps any, the switch in the photo is 15A, 125/250VAC.