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Adresable relays
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qwertis:
Hello guys,

For a volunteer artwork project, I want to switch 30 230v light bulb - stretched over 35 meters.

Hardwired would be the best way to go ( no unstable wireless) because it needs to be robust and they will be switched on/off fast (the delay has to be minimal).

Therefore I would like to daisy chain the relays - addressable relays just like those ws2812 LEDs or DMX. Significant less cable is needed this way and I can connect them any way I want.

Preferably they have their own address so I can send a command like '14 1' which turns on the 15th relay.

Needless to say it needs to be relatively cheap. So giving each relay an Arduino with dmx shield would be a bit too much.

I envision this to be controlled by one Arduino (in addition with a dmx shield - if possible).

I've searched the internet for inspiration and similar projects but couldn't find one.

Could you tell me how you would have done something like this? Or maybe there is a better way than mine? Or is led the way to go (cost vs aesthetics, bulbs are way more beautiful)?  :)

Thank in advance for your advice,
Mark


ogden:
Easy. Virtually any DMX LED dimmer with 12V relays instead of 12V LEDs connected, will do the job. Just don't send dimmed signal - either off or full brightness. [edit] Relay coil needs flyback diode to protect dimmer from overvoltages.

Just one of first internet search hits that would be OK: https://www.mossled.com/products/dmx-decoder-24-channel-16-bit-high-current Or this, cheaper one
qwertis:
Hello,
Thank you for your reply!
This device would stand in the middle of the 30-meter path. To run two wires from this base station to all the relays would mean I need a lot of cable. I need to switch 30 bulbs, ever meter. So this means 2x1 meter + 2x2meter + 2x15 meters would add up to 242meters (x2 because you have a data + ground)(!) of cable. Okay, 12v rates cable would be way cheaper than 230v rated Cable. But still a lot of wiring.

To clarify:
I would like to use normal 230v ~25w household lightbulb.
The purpose is a 'light' show among a path of 30 meters. Each bulb is placed roughly every meter.
I am away from the speed and lifespan limitations of mechanical relays (vs solid state).
The kind of bulbs and switching times are subordinate. Most important is to daisy chain them (like ws2811 LEDs). If switching times and or watts are limited - I will be able to live with that.

See also the attached image
ogden:
Then use many DMX triac dimmers, one for each lamp or two.

sorin:
You can use shift register, and maybe just to be sure, you can parallel them with and port.
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