Bug994 Posted September 26, 2020 Posted September 26, 2020 Is there a way for me to subscribe to 12VDC output trigger (as is found on A/V receivers, projectors)? For instance, my Russound has this functionality: 12VDC System Trigger Out Trigger Out 12VDC output is used for triggering an external amplifier or other component. The connections for the output are made using a two-conductor cable with 1/8” male mini-plug jacks at each end. The tip is positive (+) and sleeve is negative (-). The System Trigger Out supplies 12VDC when the first keypad is turned on. The 12 VDC is removed 5 minutes after the last keypad is turned off. I'm looking for a some way to detect when either of those things happens: when the first zone/keypad turns on, give me something that I can use to fire a program. Five minutes after all of the zones have been turned off, let me fire another program. It seems like everything I can find about 12V triggers are the opposite: using some devices to send an input trigger to another device to turn it on. I want to do the opposite: DETECT a trigger and do something with it. I found this older thread which discusses asks similar: But I don't want to turn a light on or off - I would like to call a Network resource in my program. Is there some way I could hack an open/close sensor or something like that? Russound is on, door is "open", Russound is off, door is "closed"? Thanks for any ideas... (preferably something that doesn't involve soldering...)
gzahar Posted September 26, 2020 Posted September 26, 2020 You could use something like this paired with an I/O Linc. https://www.amazon.com/dp/B00LWX9PPA/?coliid=I3TZQA51Z1RMS9&colid=3FU9DR7KP09DP&ref_=lv_ov_lig_dp_it&th=1
Bug994 Posted September 26, 2020 Author Posted September 26, 2020 Cool - I'll start looking down that path. I assume that I would need to cut the 1/8" plug and separate it out into separate wires for the input side. Will do some further research (and probably pop in back here with more questions I'm sure...)
Bug994 Posted October 7, 2020 Author Posted October 7, 2020 Popping in with more questions - really feeling my lack of knowledge on circuitry and electronics here... So I got the 12v relay as suggested (https://amz.run/3djb) but I'm not really sure how to hook everything up. From my receiver/amp I have a 12vdc trigger output - I got a cable with mono 3.5mm jack on one end and two breakout wires on the other end. The input side of the board is four options: VCC (power supply +), GND (Power supply ground), GND (Control signal ground) and INPUT (Control signal input). Intuitively I thought that I would take one of the 12vdc ends and use it for VCC and the other for the Power Supply Ground - i.e., the 12vdc trigger itself would be powering the relay module. I was hoping that I would get the LED to light up, even without anything hooked up on the other side. Now I'm not so sure - do I need to have an actual (separate) DC power supply to the VCC/GND? And then hook my 12vdc trigger output into the Control signal side? I thought that the power from the trigger cable would take care of everything but now I'm not so sure. The other side then looks like this? COM1 to i/o Linc GND and then NO1 (or NC1) to SENSE? Thanks for looking at my remedial questions...
gzahar Posted October 8, 2020 Posted October 8, 2020 I would think the 12v trigger out could power the relay without a separate power supply. Only requires 30mA. It should definitely not require any connections on the relay output side to test. Your relay out connections look fine. For the input, the 12V trigger + (probably tip on the 3.5mm connector, but I would check with voltmeter) should go to relay board VCC & INPUT. The 12V trigger - (3.5mm ring connection?) would go to GND (the two ground inputs are tied together internally, so either should work). Have you verified the trigger output is activated? (the LED will only come on when it is active)
garybixler Posted October 8, 2020 Posted October 8, 2020 (edited) Thought these may be of interest. ELK-912 or ELK-912B. They are passive and need no external power. Edited October 8, 2020 by garybixler
Bug994 Posted October 9, 2020 Author Posted October 9, 2020 Gzahar - It indeed looks like the trick for the relay was to provide the power to BOTH the VCC and INPUT channels (like you suggested) - making a small jumper wire between those two makes it work as expected: 12v trigger has power, LED lights up. 12v trigger goes away, LED turns off. So now it's on to the i/o Linc side of things and then figuring out how to integrate it into my ISY program. I'll report back...
Bug994 Posted October 9, 2020 Author Posted October 9, 2020 On 10/8/2020 at 11:17 AM, garybixler said: Thought these may be of interest. ELK-912 or ELK-912B. They are passive and need no external power. Thanks, Gary - I'll look at one of those if I have trouble moving forward ...
Brian H Posted October 9, 2020 Posted October 9, 2020 If you go for a 12 volt relay it would be wise. To have a reverse polarity diode across the relays coil. To suppress the voltage spike when the relay is turned off. The ELK-912 has the diode on it as part of the assembly.
Brian H Posted October 11, 2020 Posted October 11, 2020 Diode is also on the ELK 912. I had thought they where going to try a plain 12VDC relay not an assembled board with protection.
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