Trouble with Infrared Communications (Custom Transmission)

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What are the models of the transmitter and receiver?

 

According to the datasheet your Arduino must transmit signal like this:

The data signal should fulfill the following condition:

Carrier frequency should be close to center frequency of the band-pass (e.g. 38kHz).

Burst length should be 6 cycles/burst or longer.

After each burst a gap time of at least 9 cycles is necessary.

The data format should not make a continuous signal transmission. There must be a Signal Gap Time (longer than 15ms) at least each 90ms (see Figure A).

Site http://www.righto.com/2009/08/multi-protocol-infrared-remote-library.html, it has very good information which could possibly help you. In the code for IR led they use sony protocol for sending the signals.

 

I think you could send the signal using those protocols and then in the other Arduino you just read the code. If you want to use your own protocol you must use send.raw.

int khz = 38; // 38kHz carrier frequency for the NEC protocol

unsigned int irSignal[] = {9000, 4500, 560, 560, 560, 560, 560, 1690, 560, 560, 560, 560, 560, 560, 560, 560, 560, 560, 560, 1690, 560, 1690, 560, 560, 560, 1690, 560, 1690, 560, 1690, 560, 1690, 560, 1690, 560, 560, 560, 560, 560, 560, 560, 1690, 560, 560, 560, 560, 560, 560, 560, 560, 560, 1690, 560, 1690, 560, 1690, 560, 560, 560, 1690, 560, 1690, 560, 1690, 560, 1690, 560, 39416, 9000, 2210, 560}; //example raw nec protocol

irsend.sendRaw(irSignal, sizeof(irSignal) / sizeof(irSignal[0]), khz); //Note the approach used to automatically calculate the size of the array.

delay(5000); //In this example, the signal will be repeated every 5 seconds, approximately.
}
void loop() {

 

Look it up in the examples https://github.com/z3t0/Arduino-IRremote, code did not paste correctly in my last post.

 

It is the timing in uS.

 

I think the easy way would be to use one of the protocols for the transmission, or you could create one yourself, look at the files in the ir_NEC.cpp for how its done.

https://www.sbprojects.net/knowledge/ir/nec.php

Some examples for suitable data format are: NEC Code (repetitive pulse), NEC Code (repetitive
data), Toshiba Micom Format, Sharp Code, RC5 Code, RECS–80 Code, R–2000 Code.

 

Yeah, as far as I know that's right. I'm not expert on this subject, just interested about it also, since I have some projects where this can be useful.

You can just use the (irsend.sendNEC(//hex value here, //bit count here) like in the demo, I cant test it since I don't have any receivers like this available. I think NEC protocol was 8 bit address and 8bit command.

 

No, maximum bit length is 32bits when NEC is used. 16bits for address and 16 for command.

0x20DF10EF = 0000 0000 0010 0000 1101 1111 0001 0000 1110 1111
address 0010 0000
inverted address 1101 1111
command 0001 0000
inverted command 1110 1111

 

Use your own code what you got from reading the tx not my example, did you try to send it using 32bits?