u/Martino_argese

Hi everyone,

I’m working on upgrading a lighting circuit in my house and I could really use a quick sanity check on my wiring diagram before stuffing everything back into the junction box.

My Goal: I want to control a pair of light bulbs using both my smartphone/Alexa and my existing physical wall switches. Crucially, I only care about dimming via the app or voice control. From the physical wall switches, I just want a standard, reliable ON/OFF toggle action.

The Problem & Constraints: The current setup is a traditional multi-switch circuit with two 3-way switches (deviatori) and one 4-way switch (invertitore). I absolutely cannot pull any new wires through the existing conduits.

Initially, I tried running the 230V switched phase straight into the S2 terminal while leaving S1 empty—which surprisingly works on standard, non-dimmable Sonoff Mini switches. However, on this dimmer model, it causes the light to stay stuck at 100% brightness and ignores all inputs. The S1/S2 ports on this dimmer are meant for dry contacts only and hate external 230V voltage.

The Solution & Parts Purchased: To bypass this without routing new cables, I bought these exact parts:

• Sonoff MINI Zigbee Dimmer (MINI-ZBDIM)
• Finder 13.31 Monostable Relay (230V AC coil)

My plan is to use the Finder 13.31 as an isolation interface (galvanic isolation). The 230V switched phase coming from the last wall switch will power the Finder's coil (A1), with Neutral going to A2. Then, the completely isolated dry contact terminals from the Finder (11 and 14) will connect straight into S1 and S2 on the Sonoff Dimmer.

I intend to set the external switch type to "Edge" (or Toggle) in the eWeLink app, so that any flip of a wall switch toggles the light state.

https://preview.redd.it/wxotbw7fq6ah1.png?width=896&format=png&auto=webp&s=d08f68e4f11f53b41a529ab221fe40bcf3aa3ef2

Does this configuration look solid and safe to you? Will the Sonoff Dimmer properly handle the open/closed states from a monostable relay when configured in Edge mode?

Thanks in advance for your insights!

Hi everyone,

I’m working on upgrading a lighting circuit in my house and I could really use a quick sanity check on my wiring diagram before stuffing everything back into the junction box.

My Goal: I want to control a pair of light bulbs using both my smartphone/Alexa and my existing physical wall switches. Crucially, I only care about dimming via the app or voice control. From the physical wall switches, I just want a standard, reliable ON/OFF toggle action.

The Problem & Constraints: The current setup is a traditional multi-switch circuit with two 3-way switches (deviatori) and one 4-way switch (invertitore). I absolutely cannot pull any new wires through the existing conduits.

Initially, I tried running the 230V switched phase straight into the S2 terminal while leaving S1 empty—which surprisingly works on standard, non-dimmable Sonoff Mini switches. However, on this dimmer model, it causes the light to stay stuck at 100% brightness and ignores all inputs. The S1/S2 ports on this dimmer are meant for dry contacts only and hate external 230V voltage.

The Solution & Parts Purchased: To bypass this without routing new cables, I bought these exact parts:

• Sonoff MINI Zigbee Dimmer (MINI-ZBDIM)
• Finder 13.31 Monostable Relay (230V AC coil)

My plan is to use the Finder 13.31 as an isolation interface (galvanic isolation). The 230V switched phase coming from the last wall switch will power the Finder's coil (A1), with Neutral going to A2. Then, the completely isolated dry contact terminals from the Finder (11 and 14) will connect straight into S1 and S2 on the Sonoff Dimmer.

I intend to set the external switch type to "Edge" (or Toggle) in the eWeLink app, so that any flip of a wall switch toggles the light state.

https://preview.redd.it/n9ss616up6ah1.png?width=896&format=png&auto=webp&s=131ee8f552d714c1604a20a01c04868a9b616f74

Does this configuration look solid and safe to you? Will the Sonoff Dimmer properly handle the open/closed states from a monostable relay when configured in Edge mode?

Thanks in advance for your insights!

Hi everyone,

I’m working on upgrading a lighting circuit in my house and I could really use a quick sanity check on my wiring diagram before stuffing everything back into the junction box.

My Goal: I want to control a pair of light bulbs using both my smartphone/Alexa and my existing physical wall switches. Crucially, I only care about dimming via the app or voice control. From the physical wall switches, I just want a standard, reliable ON/OFF toggle action.

The Problem & Constraints: The current setup is a traditional multi-switch circuit with two 3-way switches (deviatori) and one 4-way switch (invertitore). I absolutely cannot pull any new wires through the existing conduits.

Initially, I tried running the 230V switched phase straight into the S2 terminal while leaving S1 empty—which surprisingly works on standard, non-dimmable Sonoff Mini switches. However, on this dimmer model, it causes the light to stay stuck at 100% brightness and ignores all inputs. The S1/S2 ports on this dimmer are meant for dry contacts only and hate external 230V voltage.

The Solution & Parts Purchased: To bypass this without routing new cables, I bought these exact parts:

• Sonoff MINI Zigbee Dimmer (MINI-ZBDIM)
• Finder 13.31 Monostable Relay (230V AC coil)

My plan is to use the Finder 13.31 as an isolation interface (galvanic isolation). The 230V switched phase coming from the last wall switch will power the Finder's coil (A1), with Neutral going to A2. Then, the completely isolated dry contact terminals from the Finder (11 and 14) will connect straight into S1 and S2 on the Sonoff Dimmer.

I intend to set the external switch type to "Edge" (or Toggle) in the eWeLink app, so that any flip of a wall switch toggles the light state.

https://preview.redd.it/0t3si3lxg6ah1.png?width=896&format=png&auto=webp&s=e6f9689694e10af0e4f993d24989be47a1e83ed1

Does this configuration look solid and safe to you? Will the Sonoff Dimmer properly handle the open/closed states from a monostable relay when configured in Edge mode?

Thanks in advance for your insights!