I have some two-phase photo interrupters I intend to use in a project and am having difficulty figuring out how to hook them up and use each phase independently. In case you are wondering, the obvious use for a two-phase interrupter is rotation speed & direction.
The issue is that the two photo-transistors in the interrupter use a common Collector, with two separate Emitters.
But every circuit I have looked at for driving a digital output has the resistor on the collector side with the output between the resistor and the collector, and the Emitter tied to Ground. Using the typical connection does not enable me to read each transistor separately. I need to read each output on the emitter side.