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I basically want my switches to act like a logical OR, so that when one, the other, or both doors are opened, a common light turns on.

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    \$\begingroup\$ It be easier if it was when the switch closes. Two in parallel would do that. Otherwise an actual OR IC and a relay circuit is required. \$\endgroup\$ – Passerby Dec 31 '16 at 5:05
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Simply wire the two switches in parallel, like so:

schematic

simulate this circuit – Schematic created using CircuitLab

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  • \$\begingroup\$ I think they want opposite logic. \$\endgroup\$ – Passerby Dec 31 '16 at 5:12
  • \$\begingroup\$ @Passerby: They want the light on when the door opens - I assume they can figure out that the switch should close when the door opens (but perhaps not, if they had to ask...) \$\endgroup\$ – Peter Bennett Dec 31 '16 at 5:14
  • \$\begingroup\$ Use an old car door switch which makes contact when the door is open. Then wire up as shown above. \$\endgroup\$ – Steve G Dec 31 '16 at 11:15

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