Hi everyone, I recently embarked on a project to integrate my external alarm system with the Shelly Uni module, and I thought I’d share my journey with you.
The Setup
I’ve been using a Visonic WL-iog alarm system, which operates on 3.3V and has two output connections (O1 and O2). These outputs are programmed to close when the alarm is triggered or activated. Previously, I was using Z-Wave devices to handle this, but I wanted to switch to Shelly Uni for better compatibility and flexibility.
The Challenge
Connecting the alarm to Shelly Uni seemed straightforward at first. I wired O1 to Shelly’s IN1 and O2 to IN2, assuming the ground connection would handle the rest. However, the Shelly app wasn’t detecting any state changes. After some trial and error, I realized the ground connection was crucial but wasn’t configured correctly. I tried connecting the DATA cable (blue #5) to the alarm’s GND, but that didn’t solve the issue either.
The Solution
After some research and reaching out to the community, I discovered that using the GND_SENSOR (#6) pin on the Shelly Uni was the right approach. I reconnected everything, ensuring the ground was properly linked, and voilà! The Shelly app started detecting the alarm states accurately.
Lessons Learned
This project taught me the importance of proper grounding in low-voltage systems. It also highlighted how community support can be invaluable when troubleshooting. If you’re looking to integrate legacy systems with modern smart home devices, Shelly Uni is a great choice, but don’t overlook the details like grounding!
I’d love to hear your experiences with similar integrations or any tips you might have for optimizing setups like this. Let’s keep the conversation going!
Cheers,
[Your Name]