DavidJ Posted July 9, 2011 Posted July 9, 2011 Hi, I'd like to use the 12v power-on trigger from my Panasonic projector to turn on a "Now Showing..." light. I get how to turn on the light, but I have a question on the triggering. What device do I need to sense the on/off 12v trigger from the projector? A 2450 IO Linc? Thanks.
Brian H Posted July 9, 2011 Posted July 9, 2011 The 2450 I/OLinc can not be triggered by a 12 volt signal. It needs a closure between the S Sensor Terminal and the GND terminal. Smarthome does have a Low Voltage Detector Kit. That includes the I/OLinc and a Low Voltage Detector. That should work. Unfortunately it is showing out of stock. http://www.smarthome.com/24950A4/I-O-Li ... Kit/p.aspx I have used an Optoisolator to trigger an I/OLinc if you care to create a small interface board to connect to it. A 12 volt relay could be made to work also. As long as you can determine the safe current the 12 volt signal can provide.
LeeG Posted July 9, 2011 Posted July 9, 2011 An I/O Linc Sensor requires GND to activate the sensor. The projector trigger could be hooked to a 12V relay. Then use the relay contacts to apply GND to the I/O Linc Sensor. Do not know if the projector trigger can energize a relay. The projector spec's should provide that answer. An alternative would be to use a Simplehomenet EZIO2X4. It has opto=isolated Inputs which will trigger with clean 12V DC. Again it depends on what the projector 12V trigger really is. The I/O Linc would be the less expensive approach if the projector trigger will energize a relay.
DavidJ Posted July 9, 2011 Author Posted July 9, 2011 Thanks guys! I mis-read the manuals, and was quite surprised when I found 5v across the GND and S terminals. I'll look into the relay or optoisolator approach and give it a go.
Brian H Posted July 9, 2011 Posted July 9, 2011 You are welcome. Calling the Input a Sensor may have not been the best choice. I keep forgetting the some of the Simplehomenet modules have isolated inputs.
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