I need to generate en (extended) NEC signal. I have connected an Arduino with a display-device via an IR cable.
Arduino --> IR-cable --> IR-input of display device
One plug is cutted and the 3 wires are connected with the arduino.
The arduino should generate NEC Signals, and the display shall react to it. Basically the arduino acts like a wired remote control.
The problem is: There are many tutorials around, that show how to do this with a sensor (e.g by using this library). But none of the tutorials says how to do it with a cable.
I found out, my previous attempts all failed, because I tried to generate a modulated NEC-signal to the display. The display however does not understand it, because there is no device that demodulates the signal. The IR sensor normally does this, which is missing in this case.
e.g. This is, what an modulated NEC signal looks like:
00 4e ff 61
The library generates the moduled signal (pulse bursts) and this is how it works for IR sensors.
But how do I have to send my IR-command, that the display understands it? How do I send a not-modulated IR signal?
The following graphic demonstrates the issue:
I do not have IR-LED Transmitter, Amplifier, Limiter, Band Pass Filter, Demodulator, Integrator, Comparator.... I just want to create the green Output-signal directly from my Arduino