Very noticable how much more blah I feel ever since it became gray outside.
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@ao @gsuberland I'm definitely going to have to do things slightly differently because this one's an absolute chonker with an M12 hook instead of M14 but we'll figure something out
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@ao @gsuberland I wonder if the 10v input is fast enough you could reasonably DMX Control it
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Graham Sutherland / Polynomialreplied to Erin 💽✨ last edited by
@erincandescent @ao ooh, @jaseg recently posted a really cool all-in-one DMX IC that might work here.
jaseg (@[email protected])
Attached: 1 image Found a candidate for #chipofthemonth just now: UCS512B3 is a WS2811-style #dmx LED driver in a smol little SO-8 that has 30V constant-current sinks for R, G, and B LEDs. Datasheet: https://suntechlite.com/wp-content/uploads/2023/07/UCS512B-IC-Datasheet-SuntechLite.pdf #electronics
chaos.social (chaos.social)
rather than using an actual LED string you could place a resistor divider between +12V and one of the OUT pins. changing the channel value over DMX changes the drive current, which will change the divider voltage. run the divider midpoint into an opamp to scale that to 0-10V, and an inverting unity opamp to get the other side of the differential line.
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Graham Sutherland / Polynomialreplied to Graham Sutherland / Polynomial last edited by
@erincandescent @ao @jaseg looks like those drivers also support DALI, so that might be the easiest approach
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Graham Sutherland / Polynomialreplied to Graham Sutherland / Polynomial last edited by
@erincandescent @ao @jaseg and looking at it, I think the 10V thing is just 1-10V, not differential.
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Erin 💽✨replied to Graham Sutherland / Polynomial last edited by@gsuberland @ao @jaseg not sure if this controller does DALI, but 1-10v current *sink* is pretty common on commercial fixtures
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@gsuberland @ao @jaseg I think this doesn't dim all the way to off though, so I'd still need a relay to kill it fully
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Graham Sutherland / Polynomialreplied to Erin 💽✨ last edited by
@erincandescent @jaseg @ao yeah, it's 10-100% dimming. not sure if there's a threshold where it just turns off at ~0V.
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Erin 💽✨replied to Graham Sutherland / Polynomial last edited by@gsuberland @jaseg @ao well shorting the control lines together seems to turn it off so do you think it's actually 0-10v control or by doing so am I gonna make the driver sad?
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@gsuberland @ao @jaseg "the ballast shall not be damaged when the control voltage V1,2 is between -20V and +20V"
Ok, pulling it down to zero is fine then -
@ao @gsuberland @jaseg so probably map things as
DMX 0 = 0v
DMX 1 = 1v
DMX 255 = 10V/floating
Plus maybe some logic can detect when the DMX is not being fed "interactively" (e.g. were dimmed to 0 & update rate is ~1/s) and throw a relay, if the ballast consumes too much power when dimmed to 0 -
@magicatgwen tbh I'm not sure I need a fake window, I just need more light in here
Especially because this house is well shaded -
Temporarily it's living on top of a shelving unit pointing up. It makes the ceiling above it uncomfortable to look at.
This might work?? -
@erincandescent photos?!
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@neilhenning tbh it's impossible for sRGB and a phone camera to do this justice
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@erincandescent @neilhenning this photo makes me legitimately concerned it might start a fire
and you're saying the photo isn't even doing it justice
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@demize @neilhenning ehh the ceiling only gets slightly warm
Ideally it would be mounted 40cm lower down or do, in order to diffuse over a wider area. The ideal height is probably for the light to be just above people's eyelines -
Graham Sutherland / Polynomialreplied to Erin 💽✨ last edited by
@erincandescent @neilhenning the fact that I can see banding artifacts in the *upper* half of the luminance range tells me all I need to know about how fuckin' bright this thing is
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Erin 💽✨replied to Graham Sutherland / Polynomial last edited by@gsuberland @neilhenning do not look directly at the sun, or the indoor sun
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Graham Sutherland / Polynomialreplied to Erin 💽✨ last edited by
@erincandescent @neilhenning I just realised that your lamp is so bright that it actually exceeds the maximum luminance that can be expressed in the Perceptual Quantizer EOTF used in HDR10+, which caps out at 10000 nits (34483 lumens)