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TCRT5000 IR Sensor

Pin Configuration 1 Collector The collector of the phototransistor is connected to +5V 2 Emitter

IR LED (Infrared LED)

Pin Configuration The IR LED or Infrared LED has polarity has a positive and negative pin. The pin which is long is the positive pin (anode) and the pin which is short is the negative pin (cathode) as shown in the above IR LED pinout.   

TSOP1738 IR Receiver

Pin Configuration Pin Number Pin Name Description 1 Ground Connected to the Ground of circuit