In this video Dustin demonstrates how to implement the logic to use signal present feedback from a DVD player to allow a single power toggle IR control to reliably control power.
Learn more about the Crestron Basics Bootcamp course here:
http://proavschool.com/crestronbootcamp
NOTE - I made a mistake in this video near the end, pointed out by
Ralph DiMeo in the comments below (thanks for setting me straight on this!) In this video, turning off the blu-ray around the 10:00 mark doesn't actually work, because I am using bluray_is_sld to enable the osc gate. The instant you navigate away from the blu-ray page the check will STOP. So it won't ever evaluate the condition where it should check for blu-ray off.
The *right* way to have done this would have been for me to use system on/off to feed the gate of the oscillator. Or even just keep it always checking regardless of what else is happening.
(sorry for the error!)
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Crestron Programming - Using DMPS Signal Feedback To Keep IR Device On | NatokHD