AMX User Forum
AMX General Discussion
dual IR emitters
AMX General Discussion
has anyone added a second IR emitter to an NI-700 turns out I am one port short. I was thinking of custom capturing all of the IR to one file and just connecting a second blink emitter to the port to allow for control of two devices.
I used 4 IR devices on 1 port but i needed an IR extender. Its no problem for 2 devices we ive done it before.
It works fine but there's a trap to be aware of.
I'm told that if you wire the two IR flashers in parallel, you run a risk that any given pulse will be grabbed by whichever LED switches fastest and the other LED then won't flash.
So wire them in series - making sure you get the polarity right.
I've done this a few times, and usually it works without issue or additional hardware. As noted, wire them in series; make sure the two devices don't interact with each other's code too. I generally run all my IR through a CALL as a matter of course because I like to use virtual devices as an alias (for example, for a sat receiver that doubles as an audio source for DirecTV XM and as a video source, so I can have two different "devices" even though it's the same hardware). SInce I already have a framework that checks for the current device name and redirects the IR to the appropriate real device, it's a simple matter to offset the channel numbers as well if I have to double up in the IR file.
I hate doing this though. It requires you have a custom IR for whatever the combination happens to be, and this offends my sense of reusability.
Xantech actually makes dual IR flashes but it's really only beneficial when using the 3.5mm mini jack.
I think I've got you all beat! I did this in my Home Theatre setup before I got my cardcage. I had 7 IR Devices on one port. I would NEVER recommend this for an install but it was just for my own personal enjoyment. I had six flashers (they need to be the same value led) wired in a series-parallel combination (3 series in parallel to another 3 in series). I ran the 7th hopped through one of the IO ports because I was controlling two TV's of the same make. I simply toggled the IO port when I needed to control the other TV. You should use the negative end of the LED lead connected to the IO (open-collector). Hope that helps.