QRD1114 Optical Detector Hookup Guide - SparkFun Learn
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F249 4 Pin Infrared Speed Sensor Module For Arduino/51/avr/pic 3.3v-5v High Quality - Integrated Circuits - AliExpress
F249 High Quality 4 Pin Infrared Speed Sensor Module For Arduino/51/avr/pic 3.3v-5v - Sensors - AliExpress
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Reflective Infrared IR Optical Sensor with 470 and 10K Resistors : ID 2349 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
KTC CONS Labs LDR light sensor module(3 Pin) for Arduino (1 Pieces) : Amazon.in: Computers & Accessories
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Optical slot speed measuring sensor for arduino
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Infrared Speed Sensor Slotted 4 pin Optical Photoelectric Module Arduino LM393 | eBay
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4 Pin Speed Sensor Module Slot Type Ir Optocoupler Speed Sensor Module Lm393 - Buy Speed Sensor Module,Slot Type Ir Optocoupler,Lm393 Speed Sensor Module Product on Alibaba.com
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QRD1114 Optical Detector Hookup Guide - SparkFun Learn
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Reading Sensors with an Arduino - Projects
Gravity: Photoelectric High Accuracy Liquid Level Sensor for Arduino (5V) - DFRobot
IR Optical Line Hunting Sensor Module with VCC / OUT / GND Pin Connector for Arduino - Flutter Shopping Universe
