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fasteddy

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Re: WS2801 RGB Strip

smartalec said:
It states that this strip is 36 LEDs per metre (i would check with Ray to ensure it is 36 leds/m and not 30leds/m)
Each pixel is made up of 3 5050 LEDs (there is conflicting pictures here, one with 2 leds per pixel and the other with 3 leds per pixel, but i assume that the strip being 12vdc that it is 3 led per pixel)
so 36 / 3 = 12 pixels per metre
so 12 pixels/m x 5 metres = 60 pixels of control over 5 metres
 

mschell

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Re: WS2801 RGB Strip

I believe that each 5050 LED has R G and B in the same housing, and that there are 36 LEDs/meter.

So there's 36 RGB pixels per meter or 180 per 5 meter strip.

You can cut the strip every 3 LEDs, so you can get 48 or 51 pixels, not 50, with the strip.

Using the individual pixels, you can get however many you want on a string. Ray should be able to quote you a price for 50 per string. These pixels are about 4 inches apart, but I wouldn't want to stretch the string too much or you'll have to waterproof the pixels better than they come from the factory.
 

mschell

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Re: WS2801 RGB Strip

Yes, that's 180 RGB channels per 5m arch, which translates into 540 (3 x 180) actual pixel controller channels. My thought on arches, if I were going to do RGB arches, would be to use the dumb RGB pixel strips in segments. That way, if I use 8 segments per arch, there's only 24 channels to sequence, rather than 540.

And the "dumb" or non-intelligent strips don't cost as much either....
 

mschell

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Re: WS2801 RGB Strip

The LED count is NOT per R, G or B LED. It's a single LED module, with 3 LEDs in each module. But there are 36 modules per meter in this strip.

This is how many strips are designed. 3 modules per segment, which are usually 100 mm long. There are 10 of these segments in a regular strip which gives you 30 LED per meter.

In the case of the WS2801 strip, it looks like there are 12 segments per meter, but there's still 3 RGB LED modules per segment.
 

fasteddy

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Re: WS2801 RGB Strip

mschell said:
The LED count is NOT per R, G or B LED. It's a single LED module, with 3 LEDs in each module. But there are 36 modules per meter in this strip.

This is how many strips are designed. 3 modules per segment, which are usually 100 mm long. There are 10 of these segments in a regular strip which gives you 30 LED per meter.

In the case of the WS2801 strip, it looks like there are 12 segments per meter, but there's still 3 RGB LED modules per segment.
I would confirm this with Ray as it may be a typo, normally the strips come in 10 controllable pixels per metre, so the 12 segments may be incorrect. I would definetly check this before purchasing this strip.
 

fasteddy

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Re: WS2801 RGB Strip

neil said:
how about this strip which appears to be 2 * 5050 nodes per segment and 36/M
http://www.aliexpress.com/fm-store/701799/209843764-329130421/5m-roll-led-digital-flexible-strip-WS2801-IC-256-scale-8-bit-36pcs-5050-RGB-leds.html
the 6803 strip I have is 3 * 5050's per segment and 30/M
The fact that there are 2 different pictures, one showing 2 x 5050 LEDs and the other with 3 x 5050 LEDs per segment has me cautious. The other thing to note is that the strip is rated at 12vdc which ussually means it is 3 x 5050 LEDs per segment.
As I said best to check with Ray before you purchase, if anyone finds out then can they confirm this.
 

dmoore

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Re: WS2801 RGB Strip

I have some of this 2801, 12v strip from another vendor. Here are the specs:

* In/out plugs on each end of the strip (one for power another for signal)
* Encased in a boot and silicone injection
* 12v input power
* 2801 pixel chip
* Each "section" or pixel is 3.27 inches or 83mm in length
* There 60 indvidually controlled pixels
* There are three 5050 LEDs per pixel
* 36 5050 LED's per meter
* 180 channels per length
* 195 inches / 4.95m overall length (excluding the lead-in/out)

Please people....don't buy 6803 anything - it's just junk.
 

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mschell

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Re: WS2801 RGB Strip

dmoore said:
I have some of this 2801, 12v strip from another vendor. Here are the specs:

* In/out plugs on each end of the strip (one for power another for signal)
* Encased in a boot and silicone injection
* 12v input power
* 2801 pixel chip
* Each "section" or pixel is 3.27 inches or 83mm in length
* There 60 indvidually controlled pixels
* There are three 5050 LEDs per pixel
* 36 5050 LED's per meter
* 180 channels per length
* 195 inches / 4.95m overall length (excluding the lead-in/out)

Please people....don't buy 6803 anything - it's just junk.
When I first read this description, I had to scratch my head and think about it before I realized exactly how this works.

Theres only one 2801 chip for each group of 3 pixels.

There are 12 groups of 3 pixels per meter, and obviously with 5 meters, there's 60 groups that can be controlled.

60 groups x 3 colors (RGB) => 180 channels in Vixen or LSP or LOR (via iDMX).

Makes sense now...
 
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