Hey everyone, I wanted to share my experience with the Shelly Pro Dimmer 2PM and how I resolved some stability issues with my long-distance switches. I recently upgraded my lighting system, replacing some old dimmers with these Shelly units. Everything worked perfectly through the app, but I noticed that two of my physical switches weren’t responding consistently. Sometimes they worked, and other times they didn’t, which was pretty frustrating!
After some research, I came across a similar issue on the Shelly forum where someone mentioned potential issues with stray capacitance in the wiring. This made me think that the longer wires might be causing some interference or voltage drops. I decided to test this theory by measuring the voltage at the switches and found that it was lower than expected, which explained the inconsistent behavior.
To fix this, I considered a few solutions. One option was to add capacitors to the wiring to compensate for the capacitance, but I wasn’t sure how effective that would be. Another idea was to use shielded cables to reduce interference, but that would have been a more invasive change to my wiring setup.
Ultimately, I decided to adjust the sensitivity settings on the Shelly dimmers. Through the app, I increased the sensitivity of the switch inputs, which helped the dimmers detect the button presses more reliably. Additionally, I added a small capacitor in parallel with the switch wiring to stabilize the voltage. This combination of software and hardware adjustments seems to have resolved the issue!
I hope this helps anyone else experiencing similar problems with their Shelly devices. It’s a great product once you work out the kinks, and the community support on forums like this really helps in troubleshooting. Happy tinkering everyone! 