I want to add a Shelly device to an existing lighting circuit to toggle the function of the circuit.
Currently, I have a 'standard'1 3-way lighting circuit with two switches at opposite ends of a space, controlling a pair of lights in the space -- one light is near each switch. I seek to be able to switch between this mode of operation (i.e. where both lights are controlled, together, by either switch), and the mode of operation where each light is independently controlled by only the switch nearest it.
To be clear, I do not want to change this permanently to two separate simple light-with-single-pole-switch circuits. Rather, I want to add a Shelly device to the circuit to make that mode be one of two selectable modes of operation (with the other mode being just as it is now. The many offerings of devices is somewhat confusing, as is the specs talking about 50VDC. This is a 120VAC (60Hz) lighting circuit.
Questions: What device(s) should I use? Will it have easily-configurable logic to control each light in the two different ways (ether changing the state of both lights whenever either of two switches changes state, or by ignoring one switch and 'passing-through' the state of the other switch to the light)? Lastly, can this be done with just a single Shelly device to control both lights independently, or do I need two separate Shelly devices?
1When I say 'standard' 3-way lighting circuit, I mean there are two 'carrier' wires between the two light switches, with one or the other being hot at any given time, depending on the state of the first switch, Then the state of the second switch determines which of those two 'carrier' wires is connected to the load.