User manual

0:m500 s600 1:m550 s550 2:m500 s600 3:m550 s600

4:m500 s600 5:m500 s600 6:m500 s600 7:m550 s550

8:m500 s1750 9:m500 s1700 10:m500 s1700 11:m550 s1650

12:m550 s1700 13:m500 s1700 14:m500 s600 15:m550 s1700

16:m500 s1700 17:m500 s600 18:m500 s600 19:m500 s600

20:m550 s600 21:m450 s650 22:m500 s600 23:m500 s600

24:m500 s600 25:m500 s1700 26:m550 s1700 27:m500 s1700

28:m500 s1700 29:m550 s1700 30:m500 s1700 31:m500 s1700

32:m500

Extent=65850

Mark min:450 max:550

The important part of this dump is the first line. This tells us that the protocol detected was "NEC"

which is protocol number "1" in IRLib's supported protocols. The data value received was the 32-bit

hexadecimal value FD807F. The rest of the information is the raw timing data of the actual marks

and spaces received. That information is useful in trying to understand and supported protocols.

This 32-bit number uniquely identifies the button that you pushed. If we push the Volume down and

Volume up buttons on this remote we would get the values 0xFD00FF and 0xFD40BF.

Try pressing various buttons on a TV or DVD remote you might have lying around the house. If the

top line says:

Decoded Unknown(0): Value:0 (0 bits)

this means that IRLib did not understand the protocol used by your remote. Here are some typical

values from other remotes. I got these from the power button on a Sony DVD player, and the play

button on my Scientific Atlantic DVR/Cable Box.

Decoded Sony(2): Value:74BCA (20 bits)

Decoded Panasonic Old(5): Value:37990C (22 bits)

This shows that the DVD player used Sony protocol which is protocol number 2 and that it is a 20 bit

protocol. The cable box uses Panasonic_Old protocol 5 which is 22 bits. Most protocols always use

the same number of bits however some such as Sony have different versions which could use 8, 12,

or 15 bits in addition to 20.

How It Works

Let's look at what's going on here. The receiver object listens to the IR sensor and when it sees a

signal it starts measuring the timing of the marks and spaces. If a particular amount of time passes

with no additional signals, it presumes that the data is complete and when you call

My_Receiver.GetResults it returns "true". It passes the data to your decoder object. The decoder