Reflective Infrared Sensor Photoelectric
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The LED emits invisible Infrared Light. The Phototransistor detects the reflected light from some external object.. Often used as a close-in Robot object sensor / line follower, paper or position sensor etc.
Typical use with Arduino uses a 220 ohm resistor from +5V to the LED (A to Resistor and C to Gnd), and a 10K resistor from Gnd to E of the Phototransistor and C of the Phototransistor to +5V. The Phototransistor E connection then goes to an Arduino digital input. A "High" = 1 on the Arduino means an object is close to the sensor and reflecting infrared light.
Dimensions: 0.94 in x 0.39 in x 0.24 in (2.4 cm x 1.0 cm x 0.6 cm)
Weight: 0.18 oz (5 g)
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