Some PCB design ideas for DIY LDD-L driver based builds - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 01-25-2019, 07:17 PM Thread Starter
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Some PCB design ideas for DIY LDD-L driver based builds

Just in case anybody finds these interesting, after building some larger scale LED setups for a couple propagation and fishroom setups I've been wanting something different than the usual offerings from places like Coralux, Steve'sLED, RapidLED, etc. All of the boards you see offered for sale work for lower voltage builds (12-24 volts) just fine, but the LDD-L drivers are compact, easy to use alternatives to the LDD-H series for smaller builds, or when multiple smaller strings are required. I for one use them extensively for nano fixtures, or for filling in the extra colors on "full spectrum" types of builds, in conjunction with 21 volt laptop power supplies, ranging in size from 3 to 7 amps, which is plenty in most smaller to medium situations.

These can be jumpered to allow channels to be doubled up, to allow four or eight channels of control on the eight driver version, and eight channels of control on the sixteen channel version, with daisy chaining also possible for stacking boards as needed for larger scale configurations. All parts are through-hole, so easy enough for even a novice to solder up


Keep in mind these are sort-of a power-user board, and while they offer pretty good flexibility, they are not as of now compatible with the Bluefish mini- although with the use of a level shifter they would be, the fullsize Bluefish will work however. I have been primarily using the LDD-L with the Storm controller or the very nice 16 channel controller featured over at Ultimatereef- https://www.ultimatereef.net/threads...roller.784531/ Any controller using the PCA9685 PWM driver would be a perfect fit for a companion to this board.


I'm also working up some sketches for larger versions using the LDD-H drivers as well, but due to the larger physical size I'm not sure I'll put more than eight drivers to a single board to keep them affordable for small runs of PCBs. Suggestions are welcome.
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post #2 of 8 (permalink) Old 01-25-2019, 09:27 PM Thread Starter
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Nano version too, 4 channels for the little guys
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post #3 of 8 (permalink) Old 01-27-2019, 02:02 AM Thread Starter
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For anybody who cares, these are an open source design, once things are finalised the files will be open to free use by anyone interested!!!

Here's the first iteration of the "EZ" Nano board, onboard DC power and 1/8" TRS (stereo) jacks, so that all one needs to do is drill corresponding holes in the panel and allow the TRS jacks to protrude slightly, and then insert power. I'll work up a drilling template too (easy peasy) to make it easy enough to use. Sure beats air-wiring things on small fixture builds!

Since this is the "EZ" version, I've left off the jumpering feature to allow it to be a very simple board, if one wishes to parallel channels they would need to do some jumpering of their own, or go with the "Pro" version of the board.

The DC jack chosen- Kobiconn 163-179PH-EX:

https://www.mouser.com/ProductDetail...5l2UOaIqcGCw==


The TRS/stereo jack chosen- CUI SJ1-3533:

https://www.mouser.com/ProductDetail...0TSYIwwZxYnQ==

If anyone knows of any alternatives that may be cheaper/preferable for similar quality let me know.
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post #4 of 8 (permalink) Old 01-27-2019, 02:24 AM
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Is VN+ on LDD2 correct???


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post #5 of 8 (permalink) Old 01-27-2019, 04:43 AM Thread Starter
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NO

Thanks for noticing, just fixed it.
Still working on it, and I make little goofups here and there!


Also working on the "EZ" version of the 8-UP board too. You'll see small, often unexplained tweaks as I go.
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post #6 of 8 (permalink) Old 01-31-2019, 05:43 PM Thread Starter
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Alright, got the boards to a mostly final state for the 4 and 8 channel versions. Attached are the current board designs.

So far this has been a very enjoyable (and challenging!) project, and I'm very pleased with the boards so far. We have standard functionality across all four, with similar layout and schemes to make them easy to understand as well as making upgrades easy when moving from one to the next. Small too! The nano versions are 50mm (2") square, and the 8Up boards are 50x100mm (2x4") for nice compact builds.

Now we just need a cool logo or symbol of some sort to silkscreen onto them
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post #7 of 8 (permalink) Old 02-08-2019, 07:47 AM
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where is the 10K pull-down attached to?
it doesn't seem to go anywhere from the jumper onward

I might be dutch but I don't have a dutch scape.


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post #8 of 8 (permalink) Old 02-09-2019, 01:43 PM Thread Starter
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The top-most end has a connection directly to the ground plane, a little hard to tell in the pics, but there is a "spoke" type connection.

Bump: also worked up the first in a series of PCBs for the LDD-H as well-
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