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T-Slot Photo Interrupter with 1 Meter Cable : ID 3985 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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10 Pcs 4 Pins 1/5" Wide Gap Slotted Optical Switch Photo Interrupter - Power Tool Accessories - AliExpress
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10Pcs 1/8"Slot PCB Photo Interrupter Slotted Optical Sensor Switch HY870P - Black - 0.9" x 0.73" x 0.24"(L*W*H) - Overstock - 25415085
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uxcell 10 Pcs 5/16" Slot PCB Photo Interrupter Slotted Optical Sensor Switch HY860H-A - - Amazon.com
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Teyleten Robot IR Infrared Slotted Optical Optocoupler Module Speed Measuring Sensor 3.3V to 5V Photo Interrupter Sensor for Arduino 10pcs: Amazon.com: Industrial & Scientific
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OPB941W51Z: Optek Technology : Photointerrupter Transmissive 3.18Mm Photologic Open Collector Buffer 5-Pin : Opto & Illumination
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Heyiarbeit 5pcs ITR9606 Photoelectric Sensors 4 Pin Opto Photo Interrupter Optical Sensor Photoelectric Switch Optical Interrupter Photoelectric Sensor: Amazon.com: Industrial & Scientific
![led - Theory and question on using a photo interrupter as a switch - Electrical Engineering Stack Exchange led - Theory and question on using a photo interrupter as a switch - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/wPxny.jpg)
led - Theory and question on using a photo interrupter as a switch - Electrical Engineering Stack Exchange
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