Electronics > Projects, Designs, and Technical Stuff

3 switches, 7 lamps (no solid state)

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Cyberdragon:
i'm trying to come up with a system to switch 7 lamps on (indevidually) with 3 spdt switches and relays (just for funsies).

I'm trying to figure out the most efficient wat to do it. Getting the light to switch on when all switches are on is easy, when all switches are on, none of the secondary switch contacts have power which shuts of a spdt relay that disconnects the common from most lamps and connects it to the remaining lamp. Each switch is connected to a light through the nc contacts of other relays.

What I'm still trying to figure out is the logic that drives the other three lamps.

Aslo, the current circuit requires the same voltage for coils and lamps. So I'd have to have a different circuit using dual pole relays for different voltages (IE LV coils and mains bulbs).

Nusa:
If by lamps, you mean LED's, check out charlieplexing. 3 pins can control 6 led's, 4 pins can control 12.

If you mean something higher wattage/voltage that requires a relay, you won't be able to make do with less than one relay per lamp. Not if they're to be independently controlled.

As for input, there are 8 possible combinations of 3 switches. If you eliminate the all-off state, that leaves 7. If your microcontroller monitors the 3 switches and waits long enough (a full second after first switch change maybe) for you to pick your combination, you could specify which lamp to toggle status on. The all-off state could either mean no change, or turn everything off.

Cyberdragon:
I should clarify ONLY spdt switches and relays (making this from scrap), for a demonstration of relay logic (no solid state allowed). The lamps can be whatever (maybe not even the same).

EDIT: It'll be AC, so polarity reversal is nonexistant.

AlfBaz:
Is there a limit to the number of relays you would like to use?
If not the easiest way to do it would be each switch turns on 4 spdt relays, 12 in total. Then it's a simple matter of wiring the appropriate switches in series using binary weights assigned to each group of relays

Benta:
Nice little exercise  :)

You'll need 7 spst relays for the lamps, 3 spdt switches and 4 spdt relays for the additional logic.

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