Hi, I would like to "remap" the remote controlers, I would simply have an ir receiver on the TV, and opposite the tv an ir diode, of course both connected to 1 arduino. this way I could control the TV and other devices 1 with a controller (which neither device natively supports) but now to the problem:
I haven't read anywhere if I should use a rezistor for the ir diode and possibly which one. because the ir diode flashes and is used only occasionally so i don't know. if I fired the diode itself after a while, I wouldn't mind, but I wouldn't want to hurt Arduino
The IR diode itself will be pulled some distance (like 4 meters (13 feet) or something like that) so if that doesn't help either.
Firstly if you see "new and genuine" for some semiconductors on eBay, you can be
pretty confident they are fakes! Buy semiconductors from a trusted electronics
supplier these days to be sure they aren't junk. (Yes, some eBay sellers are good,
but its hard to know which are which without personal recommendation)
You asking about how to drive an LED, this case its an IR LED, but its just an LED.
The datasheet will say what the maximum operating current (Imax) is, both continuous
and pulse mode (which is more relevant to IR remote controls). It will also say
what the forward voltage is (Vf).
If your supply voltage is Vs, then the resistor value should be at least
R = (Vs-Vf) / Imax
For instance if the pulse rating is 100mA, Vs = 5V, Vf = 1.1V, you'd calculate R = 39 ohms
for pulsed use.
Note that a large current like 100mA cannot be driven from a microcontroller I/O pin,
its far too big, so some sort of transistor, MOSFET or driver chip will be needed typically.
Personally, I don't care if it's original or not, I just clicked on the first ir diode I found on ebay.com, maybe I would use one of the old remote controls. If it worked for at least 50% of the time it lasted and nothing happened to arduin, I don't care
But I will definitely arrange an external power supply
It’s not about originality it’s about quality and performance , a cheap device may not for example give out as much light or last along or give out light on the right wavelength . A lot of cheap components maybe rejects from manufacturers as being “ out of spec” -it can cost you a lot of time
