RTG

Ah. I'm guessing that's what you and @garybixler meant earlier about installing a reverse diode. Got it, and I fixed it. I soldered one more wire (I'm getting better at it) to the incoming 5V power source on the PCB, then removed the jumper wire and moved the LED #1 wire over to the input terminal on the relay. It works perfect. I moved the whole setup to the garage and edited the test program to run the landscape lighting instead of my test chandelier. It works great. All I need to do now is mount the solar motion detector on a post at the end of the driveway and I'm done. You guys are great. Thanks again for the help!

Success! (At lest in the lab). My soldering job is horrific, but I got it to work. Here's what I did: Ordered the relay @epfunke linked above. (Thanks for the tip!) Soldered a ground wire to the PCB ground and a power lead to the #1 pin on the chip in the pic above (which is the power for the #1 LED). On the relay I connected: the power lead to the pos. power terminal (DC+, or VCC, depending on your relay) the ground wire to the neg. terminal, and a jumper wire from the pos. terminal to the input terminal. This causes the relay to turn on when the speaker's LED pulses on, and off when the LED turns off (which it does once per second for six seconds when the alarm is tripped) Connected the relay's Normally On and Common terminals to the Ground and Sensor terminals on the I/O Linc. (Doesn't matter which is connected to which.) Now when the alarm is tripped the I/O Linc sensor pulses on, then off, six times. To deal with the pulse I programed a State Variable in the ISY to count the number of times the I/O Linc sensor turns on. I then wrote a test program If: $Driveway_LED_count >= 4 (I started with "6", but it didn't work right. When I reduced it to "4," it worked perfectly. Not sure why.) Then: Set 'Chandelier' On; Wait 10 seconds; Set 'Chandelier' Off; $Driveway_LED_count = 0 End result: When I trip the driveway alarm the LED pulses six times, my chandelier turns on, then turns off at appointed time, and the LED pulse count resets to zero. This is exactly what I wanted. If someone drives or walks down my driveway in the middle of the night, I want my landscape lighting to come on and stay on for about an hour, then turn back off. We live out in the country and deer walk through my front yard all the time. So I don't want an internal alarm going off. This will be enough to make sure people coming up to my house know they are on Candid Camera. Thanks to all of you for the help and advice. This was fun.

That’s right. The numbers I wrote on the black chip are the power connections in front of the respective resistors for each LED (#s R63, R20, R14 and R10). I thought that would be the best place to solder wires. The ground (which I forgot to mark) is above the chip. I can easily solder a wire to that. we are in Savannah right now, but I’ll jump on this early next week when I get back. I’ll let you know how it goes.

We now aren't leaving for trip until tomorrow morning, and I couldn't wait any longer to dig into this thing. So, I took the speaker apart and found the following (picture attached): Each of the four LED lights pulse on and off six times (about once every second) when its respective alarm zone is triggered. I traced each LED to its power source in front of its respective resistor. I marked the sources as #1 - #4 in the picture. On my analog multimeter they pulse between zero and 6 volts when the zone is triggered, but I think it's less than 6V because my multimeter registers 2V on a 1.5V, AA battery. So, the LED power source probably pulses closer to 5V before it gets to the resistor. I now have three challenges: I need to find the right relay that will close the contact so my Insteon I/O Linc sensor can read it. I need to figure out how to deal with the fact that the power source pulses six times, rather than one long power draw. Is that going to cause problems with my I/O Linc? I guess I can insert a "wait" command somewhere in the program and have it wait 6 seconds after receiving a signal from the I/O Linc before it does anything. I need to figure out how in the world I am going to solder wires to this pcb. I put a small paper clip in the picture to give it scale. I don't think I can make a dot of solder that small and keep it from crossing over to another connection. So once again I appeal to the superior talent in this thread for advice. Thanks for helping me on this journey. I like learning new stuff!

Got it! That makes perfect sense. I would then simply connect to the front side of the resistor with the correct relay. I think I can handle that. We are headed out of town for a week (for the first time in 2020). So, it will be a week before I can get to it, but I'll let you know how it goes. BTW, I saw your occupation. I'm a huge Broadway fan. I hope you all get back to some sense of normalcy soon. Thanks again.

Thanks @epfunke. I'm not an electrician, but I play one in my house (frequently), and I'm always willing to learn more. I've got about 80 devices connected to my ISY. The speaker for the driveway alarm can monitor four separate motion detectors. An LED behind each of those four zones lights up when the respective motion detector gets triggered. I'm sure I could solder a wire inline with the LED for the one zone I monitor. I just need to find the right transistor and relay. Thanks again!

Thanks Brian. Do you mean something like this? https://www.amazon.com/HiLetgo-Voltage-Detection-Arduino-Electronic/dp/B01HTC4XKY/ref=sr_1_1_sspa?dchild=1&keywords=voltage+sensor&qid=1601639842&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExVlcwR1ZDUzIwRzVZJmVuY3J5cHRlZElkPUEwMTE1MjE4V1ZTTDc5WjlNNlkyJmVuY3J5cHRlZEFkSWQ9QTAxNTc1OTUzQUFCQUVMTVkwQ01SJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

It’s a Hosmart 1/2 Mile Long Range Solar Wireless Driveway Alarm, but I’m not sure what the model # is. It has a round speaker. Thanks gzahar for the link. I would actually like to disconnect the speaker entirely, but the option you provided might be a very simple solution I can live with. I don’t really need the sound, and I’m concerned that other sounds might trigger the I/O Linc. But I might still be able to work with this.

I have a wireless, solar powered driveway alarm at the end of my long driveway. If someone comes down my driveway it triggers a chime/tune in a speaker plugged in to my house. I would like to use the sensor connection on an Insteon I/O Linc Remote Controller (#2450) to sense power going to that speaker and trigger events in my ISY994i/IR Pro. For example, if someone walks or drives down my driveway after 2:00 AM (when my landscape lighting has turned off), I would like for the driveway alarm speaker to trigger the I/O Linc to turn on the landscape lighting for 10-15 minutes. I can handle the programming once I get the I/O Linc to recognize that the driveway alarm has been triggered. If I solder wire to the two speaker wires and connect them to the I/O Linc sensor and ground, will the I/O Linc Remote Controller sense the momentary power that goes to the speaker? (I presume that is DC power.) I am certainly open to other ideas. What I can't do is run power all the way to the end of my driveway to install a standalone Insteon motion detector. All wisdom is appreciated!