Infrared detector for 5-line infra-red emitter Infrared detector for 5-line infra-red emitter:After power is connected to the infra-red emitter, if the green light of the emitter and the red light of the receiver are both lighted, it means that the emitter and the receiver are not on the same level and not in the samestraight line. Then, the position of either the emitter or the receiver needs ...