I want to design a bathroom light that automatically adjust color and brightness according to many factors (time of the day, people presence, mood, weather...) but I don't trust myself with electronics so I want to design a foolproof way to override my device so that I can normally switch lights.

Fort this design I would like to use two switches. The first switch is a dpdt that will activate the manual override, and the second switch will actually operate the light (provided override is active, otherwise it should not do anything).


Is it possible to build such circuit with commercial switches such that it will blend with normally used switches like in the picture? How are they called?


  • \$\begingroup\$ You can do this with a "3 way" switch, and a regular switch if you change the circuit a little bit. \$\endgroup\$
    – Drew
    Nov 28, 2020 at 2:56
  • \$\begingroup\$ I’m listening... \$\endgroup\$
    – gurghet
    Nov 28, 2020 at 2:58
  • \$\begingroup\$ 4 way lighting switch has only 4 terminals. You need 6. In your drawing manual override looks like two 3-way switches. It will be two buttons. Why just not to put one 3-way switch before transistor? \$\endgroup\$
    – user263983
    Nov 28, 2020 at 2:58
  • \$\begingroup\$ I corrected the question text, it's a DPTP switch \$\endgroup\$
    – gurghet
    Nov 28, 2020 at 2:59
  • \$\begingroup\$ I think you mean DPDT but you had me puzzled for a bit. \$\endgroup\$
    – user16324
    Nov 28, 2020 at 10:34

1 Answer 1


A "3 way" switch for domestic wiring, plus a regular switch should be able to do this:

circuit diagram

  • \$\begingroup\$ This looks much better than my design. I’ll examine it and probably accept the answer. \$\endgroup\$
    – gurghet
    Nov 28, 2020 at 3:39

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