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IR

TCRT5000 IR Sensor
TCRT5000 IR Sensor

TCRT5000 IR Sensor

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

IR LED (Infrared LED)

Pin Configuration The IR LED or Infrared LED has polarity i.e.it 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
TSOP1738 IR Receiver

TSOP1738 IR Receiver

Pin Configuration Pin Number Pin Name Description 1 Ground