One side was an infrared led, and the other was a phototransistor although with only two pins I think it should be called a photodiode. With that part ready, my first goal was to scour the Internet for examples of these types of projects. So I gave up and attacked it another way. Looking at the specifications for the device, the diode side was easy. I saw a reference to using a ohm resistor, so I used an available one ohm and connected it to power. Anything over that would keep my current under 50mA, no matter what the resistance of the diode might be.
In any case, I had proof the diode was working, so now on to the photo-transistor. My next step was to connect power to it, and then connect the other lead to a resistor again, ohm and to ground:. At this point, I hooked in my multimeter, and checked the current. Then, I put a piece of paper into the photointerrupter to cut the beam, and watched as the milliamps went to zero.
I had a working detector! Brilliant, thanks for taking the time to write this up. I was looking for exactly this having salvaged a couple of slotted optical sensors from an old printer. Most of photo interrupter are 5v. How can i plug it to 3. This light enters the phototransistor, resulting in current flow. By continuing to browse this website without changing your web-browser cookie settings, you are agreeing to our use of cookies.
Please use latest browser to ensure the best performance on ROHM website. Rohm Breadcrumb. What is a Photointerrupter? Photointerrupters A Photointerrupter is a transmission-type photosensor, which typically consists of a light emitting elements and light receiving elements aligned facing each other in a single package, that works by detecting light blockage when a target object comes between both elements, acting as an optical switch.
At ROHM, we refer to optical-type photosensors as photointerrupters. Reflector-Type Photosensors Photoreflectors Reflector-type photosensors Photoreflectors are configured by positioning light receiving and emitting elements on the same surface. Electronics Basics What is a Transistor? What is a Diode? What are SiC Power Devices?
What are SiC Semiconductors? What is IGBT? What are LEDs? What is a laser diode? What is a Resistor? What is Tantalum Capacitor?
What is Binary? What are Opamps? What are Opamps and Comparators?
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