# Arduino IR remote NEC control

I'm trying to build a generic IR remote controlling device using an arduino.

I've done some investigation to discover the IR protocol used by my NAD SR8 remote controller.

I've connected a simple IR photodiode to an oscilloscope in order to dump the signal coming from the remote (VOL UP key).

I got the following:

This signal looks like a NEC IR protocol regarding the documentation. I've decoded the signal:

1110 0001 0011 1110 0001 0001 1110 1110


I don't know why but this signal does not fully comply with the protocol specification:

[1110] 0001 [0011] 1110 0001 0001 1110 1110


Am I wrong somewhere (wrong protocol) ? Is the remote controller broken ?

• Where would the deviation be in your opinion? – jippie Jul 20 '13 at 19:33