Re: Help needed for circuit design
Right now I don't have time to draw the circuit, I don't have it drawn already with me at present. The hint is use 2 light beams and determine their order of interruption to determine the direction of movement of a person.
Also if a door is really wide then it will be difficult to ensure people enter in a single file, and if they don't, this type of circuit won't work. If you do ensure single file, I think you have to have a strips of pressure sensors, to cover major length of the bottom of the door frame, each strip length less than the width of the wheelchair wheels.