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Learn Arduino Prototyping in 10 days by Kallol Bosu Roy Choudhuri

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Using an IR transmitter LED

The IR transmitter LEDs look similar to normal LEDs, but are slightly larger than the normal LEDs:

Figure 12: A typical IR transmitter LED

An IR transmitter LED has two legs (terminals) as shown in the preceding figure:

  • Positive terminal (longer leg), this pin will be connected to the 5-volt power supply pin of the Arduino.
  • Negative terminal (shorter leg), this pin will be connected to the GND pin of the Arduino, via a transistor.

The parts required for building the IR transmitter prototype are listed as follows:

  • One Arduino Uno R3
  • One USB A to USB B cable
  • One IR transmitter LED (Blue/Transparent/other color) ...

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