I want to make a Distance Calibrating sensor using only IR emitter and photo diode. In short I need an electrical voltage as an output for the corresponding intensity of IR emitter that falls back on photo diode after reflection. Once a I get a voltage that is consistent to the distance of the object my purpose is served. The object to be detected is always a smooth white surfaced wall and my sensors at all times are perpendicular to the plane of the wall. All the external parameters like ambiance because of sun , camera flashes and other sources of noise should be considered. Kindly Help me with a circuitry or some really nice implementable ideas.
Thank you
Thank you