avr ir transmitter
you need to design Infrared transmitter and receiver circuit and it
doesn't depend on microcontroller. but when you connect the transmitter
and reciever to the microcontroller, you need to design a transmission algorithm
to sen and receive data. it means that you must send your data with header ,tailer and parity with a timing that is synchron with receiver, then when
receiver checks the correctness, it sends back the answer or Ack. you should
design the algorithm yourself, but you can find IR transmitter and receiver circuits on the Internet.
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