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Large 7 segment kit

by JujuGG Feb 2, 2018
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Got it. Remade the segments into single pieces so I could print them large. As soon as I get one of my Robo R1+s going again I'm making a 12" segment so it'll be a little over two feet height per digit. Haven't gotten the zip tie part taken care of yet but it's on the list.


Great result !

Have you hosted your code on Git or elsewhere? I'd like to use that if you have it. Thanks.

No, I have not shared the project because, the hardware and software works. But it was definitely not the best solution.
Also, the usage was very specific : timeshoot of 3 displays using an electrical cable of only 3 wires, with a 2 buttons remote.

What is your project ?
What is your hadware ?

I'm building a simple 6 digit stopwatch to time an activity.

Presumably, I will use WS2812B 144 strips but there are also 300 strips which might work better so I'm undecided at this point. I have 12V PSUs to power and will use either an STM32 board, RasPi, or a run-of-the-mill Arduino compatible board with relatively high memory/processing to control the display.

opps, I read wrong. You're doing a stopwatch, not a clock.
Be careful if it's for outdoor use. WS2812B may probably not light enough when there's sun.

Yeah, better use adressable leds for this kind of use. Less electronics, less problems, less waste of time.

144leds/m, I'm not sure it will fit perfectly in the frame. I have designed the frame with 60leds/m.
It's possible to modelize a 144Leds/m strip and test with the 3d model frame, but unfortunately, I don't have 144Leds/m.
Maybe if there is a datasheet on internet with all dimentions. (There is not yet 144leds/m 3D model on grabcad...)

300 strips ?


Also, It' will be better to do an other model for adressable leds without the cable manager (big time saving, plastic saving)
What do you think ?

Here is a pic showing the measurements. The 144 strip is wider so you were correct. https://i.imgur.com/6ABZDWz.png

Each LED link is the equivalent of 6.92mm x 12mm.

When I searched the strips one said 300 but reading it again it was per 16 ft.


It's an indoor project and will have a diffuser of some type over the segments. I'm thinking a white dome-like strip that snaps over the edges of each segment.

I agree that it would be an improvement if you eliminate the cable raceways. Any part that requires bridging can be done away with. If the strip raceways were fully open with lower sidewalls and had a few notches to use small zip ties that might be nice and would reduce print time as well as add some security. Additionally, it would allow the usage of IP67 strips that are quite a bit bulkier. It works well as-is, but no harm in updates.

Have you considered making this more modular and having it be single segments? With that you could make a few different sizes pretty quickly and put them out. If I had my way, I'd be able to print individual segments that were doubled up (two strips per segment) at 10 inches per segment. 10-11 is about the max you can expect out of a 200mm build plate if you print at the 45 degree angle.

Do you know of a brighter addressable strip than these? The 144's will probably work fine without making changes to the design.

Feel free to message me directly and I'll shoot you my email address.

For the diffuser, you can just use a flat strip instead of dome strip. You will need to get the good distance between leds strip and diffuser.
The good distance depend of the density of leds/m, and the lighting angle of the led model.
If it's too close, each pixels will be visible.
And if it's too far away. The light will be not uniform.

Example :

Sorry to answer late.

I don't really have time for this project.
Do you want the 3D model to remix it for you own needs ? (Unfortunately, I have not used parametric design, and the 3D model is not very clean. But it's better than simple STL...)

It's a Fusion 360 project, You want it? (I can convert it to another format if you prefer)