I'm having trouble getting a clean high/low response from my IR emitter-reciever module. I'm using an LED in series with the detector to show when it conducts and it only goes from dim to bright.
I scavenged several RPR-220 reflective modules from a discarded document feeder and found the datasheets online. My encoder disks are 'about' 3mm from the detectors. The disk resolution is 44. (I guess that means 44 pairs of stripes.) I put a 15-turn trimmer in series with the emitter to help find the sweet spot.
How do I get a clean high-low signal? Comparator? Schmitt trigger?