i am trying to build a proximity sensor using dual reflective sensor. it has an IR LED and a phototransistor in a single casing with a thermal and opaque shielding between the two. the ir rays are reflected from any object and the phototransistor detects it.
the sensor has 4 terminals. two of the LED and two from the collector and the emitter of the phototransistor while the base current is controlled by the intensity of IR rays incident on it.
The problem is identifying the terminals. any ideas about how to identify it?
the sensor has 4 terminals. two of the LED and two from the collector and the emitter of the phototransistor while the base current is controlled by the intensity of IR rays incident on it.
The problem is identifying the terminals. any ideas about how to identify it?