A simple breakout PCB for the GP1A57HR photo interrupter (also known as a photogate, photodiode, or phototransistor). This PCB has three connections for PWR, GND, and Signal.
When the gate is clear, SIG will be high (>4.9V). When the gate is blocked by a finger, writing utensil, food pellet, or anything else - SIG will go low (<0.4V).
Assembled picture is for reference only, board comes bare; photo interrupter and the 220Ω (330Ω, works as well) current limiting resistor are listed below.
This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.
Skill Level: Noob - Some basic soldering is required, but it is limited to a just a few pins, basic through-hole soldering, and couple (if any) polarized components. A basic soldering iron is all you should need.
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This little board makes interfacing the Photo Interrupter a breeze. My only wish would be for some sort of mounting holes.
I'm going to be using this in a Lunar Clock, to detect the starting-point slot in a large wheel. Its mounting needs something like screw holes so I could fasten it to a supporting (insulated) bar. It would be great if that mounting didn't increase the width of the sensor - I'm trying to minimize the space between the wheel and the outside of the clock. A pair of small bolt holes near the P and S of PWR and SIG would be perfect.
P.S., I used a 3-pin header soldered so the pins are below the board (the opposite side of the Photo Interrupter part). That made it easy to insert it into a breadboard to try out the code and electronics.
Bought 8 of these for a project. All worked.
Works exactly like you’d expect, easy to set up and program on a raspberry pi. Would be nice if it had mounting holes.
Been using them for years with the photo interrupters for homing engraving machine axis. They rarely go bad, and work perfectly!