Build Guide · Lighting Control
Three-Way Switches
Control one light from two locations using a pair of 3-way (SPDT) switches.
What you’re building
Parts to add
- 1Power Source
- 23-Way Switch
- 1Light
Steps
Add the parts
Click Power Source, two 3-Way Switch, and one Light.
Feed the first switch
To wire, click the first terminal (it highlights), then click the second to connect them. Power goes to the common of the first 3-way.
Power Source L1 → 3-Way A COMRun the two travelers
Connect both traveler terminals of switch A to the matching travelers of switch B. These two wires are what let either switch change the path.
3-Way A T1 → 3-Way B T13-Way A T2 → 3-Way B T2Feed the light from the second switch
The common of switch B feeds the light; the light returns to neutral.
3-Way B COM → Light (left)Light (right) → Power Source NEnergize and toggle
Click Energize. Flip either switch — the light toggles. Either location controls it, no matter what the other switch is set to.
✓ Test it
- Flip switch A: light toggles.
- Flip switch B: light toggles.
- Either location controls the light, regardless of the other switch’s position.
Tip: Think “which traveler,” not on/off. The light is on when both switches sit on the same traveler.
Open the Sandbox and build it
Follow the steps above with the trainer open in another tab.
Open the Sandbox →