Novosti – Lemilica

Cheap EOS3 BGA64 design

Goran Mahovlić 12. February 2021. Elektronika, Mikrokontroleri 0

I bought EOS3 BGA on CrowdSupply and as I started to work on my board. After some time I have discovered that it would be hard to make it at low price.If I would do it correctly I would need to use small vias, probably buried vias so for few boards that did not make sense to me…But as I still wanted board I had some idea to do it hacky way. If I do not use VIA under BGA then all will be good and cheap. I tough that one of two approaches should work.First idea was to use just the pins I need – and not to place pads for the pins I do not need. But then I looked at the datasheet and as I discovered some pins in datasheet would not mind if they are connected on startup I used other approac... »

ULX4M-LS – NLnet funded FPGA board

Goran Mahovlić 28. November 2021. Elektronika 0

At start of the year NLnet decided to sponsor development of modular FPGA, for now we will call it ULX4M as first version should have everything that ULX3S already has. https://radiona.org/ulx3s/ Goal is to make board modular and add more peripherals. We are specially interested in adding fast SerDes peripherals that are now missing on ULX3S. Along with that future plans are also to create modules with multiple FPGA vendors so we can do more vendor neutral coding. https://nlnet.nl/project/ULX3S/ It all started with selecting connectors – you can check story here http://lemilica.com/archives/3158 We ware also interested in blender so Paula joined team – her story is here http://le... »

Continuation of work ULX4M funded by NLnet

Goran Mahovlić 21. September 2021. Elektronika 0

Milestone 2 •Start to work on first daughter board that will have selected connectorsFor start I first needed to completly dissasemble ULX3S.I did that in a way of spliting into modules. https://www.linkedin.com/posts/goran-mahovlic_ulx3s-innovation-activity-6823611763443933184-4n5O Once I had everything separated I combined parts from same module.After combining parts I checked what parts could be smaller, and changed them to smaller replacement.Once I were satisfied with size I squeezed parts together, to have a little space, but still be nice and tight. All 3 power supply modules are then sorted the same way. And rounded with lines.Now PS units are looking like a puzzle… •We will aim to h... »

Modular FPGA board

Goran Mahovlić 14. May 2021. Elektronika 0

At start of the year NLnet decided to sponsor development of modular FPGA, for now we will call it ULX4M as first version should have everything that ULX3S already has. Later we want to add more peripherals, and we are specially interested in adding fast peripherals that are now missing on ULX3S. Along with that future plans are also to create modules with multiple FPGA vendors so we can do more vendor neutral coding. https://nlnet.nl/project/ULX3S/ We started this project with buying few versions of connectors. We selected cheaper ones – as we want to preserve affordability if ULX3S board. Little bit better connectors are priced around $7-$10 per pc. sometimes even more, and our plan ... »

Modular FPGA board – blender

Paula 13. May 2021. Elektronika 0

Paula: Blender: We imported the board from KiCad in various formats into Blender in order to get the most customized and simple object for editing or manipulation. The first problems were related to the excess geometry that occurs when importing .stl and .obj format. This problem needs to be solved at the beginning due to complications which happened with colouring part of the object or with selecting many surfaces. I made a mistake colouring objects after adjusting the whole animation, so there was a lot of problems that were difficult to fix and I lost a lot of time. I’ve learned that the process should be followed this way: import file, separate components, clean geometry, colour componen... »

Adjusting microscope focus with adapter ring

Goran Mahovlić 12. February 2021. Elektronika 0

At some point I have ordered microscope. I wanted one that would have Simul-Focal Stereo with HDMI out that would allow me to work on it looking on eye peaces while recording or streaming at the same time. But it was impossible to get good focus at eye-peace and on the HDMI at the same time. I could get it close to good if I loose camera holder, but then it was shaky and not stable, but I was to lazy to fix it with some 3D printer ring… One day my friend Darko arrived, and saw that this is not stable. As he is always targeting perfection he told me he can fix this in no time… He did fast sketch of new adapter ring Next day he was back with aluminum ring And from that day microsco... »