04-06-2021, 06:55 AM
I just tried using two photodiodes as recommended by Bill Thompson on his website. Please see my post “Beam of Light Good Results” I was skeptical but it worked great. I was able to get the diodes on EBay at $16 door a pack of 5. I connected two together as he recommends with opposite polarity and a 3.3k resistor across their output. I was truly amazed.