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NQ on A Raspberry Pi Phone For The Modern Era.JanW on Lithium-Ion Battery Circuitry Is Simple.fiddlingjunky on A Raspberry Pi Phone For The Modern Era.This Week In Security: PHP Attack Defused, Scoreboard Manipulation, And Tillitis 1 Comment (while looking real good on a resume)Īlso the benifit of choosing exactly what microprocessor to use as there is a very very wide variety out there to suit basically any need from a simple camera to an AI powerhouse. I would encourage more hobbiests to do this and not be too scared as it can be much much cheaper in bulk if you decide to sell the product over a lot of these ready made modules on the market.

PACKET SENDER HOMEBREW HOW TO

There is also the OS but most manufacturers supply both documentation on how to get a build up and running along with ready to go full fat Linux distros. The only catch is often you need to sequence 1 or 2 processor power rails and the ram but there are single chip solutions to this and more chips out there don’t even need this. I my self have made several and it’s not that hard to do just rather annoying to get the memory traces.Īll you really need is the microprocessor, ram, some custom CAD models and an SD card sticket and you can get something up and running fairly fast. Even though it’s 30 years old, it holds up quite well.Īt work we make embedded Linux systems fairly regularly. It explains the principles of transmission lines, current return path, crosstalk, EMI, etc. I have a copy of the book mentioned, and have read most of it. – don’t route high speed signals over plane splits – route your most sensitive signals first – choose the width of your traces (and spacing of your differential pairs) to match the impedance you need for that signal – use 4+ layers so you can have a continuous ground plane. Most of these considerations boil down to some pretty easy-to-apply practices for laying out your boards, e.g.: You also want your power supply (and ground) for each IC to be very low-impedance, otherwise you’ll see VCC drop and GND rise every time the IC draws current. You have to worry about the path that the return current for any signal will take, there are also special considerations for when you need to move your signal to a different layer. Impedance discontinuities will cause reflections, so you need to make sure your traces have the right impedance. At high speeds, you’re essentially sending radio waves between components, and so your traces need to act like transmission lines. Matching your trace lengths is part of it, but there’s a lot more to it than that. Posted in computer hacks, Linux Hacks Tagged SBC, single board computer, system on chip Post navigation

Over the course of about six months, we got to watch the open hardware board go from concept to a diminutive first prototype.

If you’re interested in more homebrew Linux SBCs, we’d highly recommend reading up on the WiFiWart developed by. For anyone playing along at home, collected up the lessons learned while developing CATFOOD, bringing the whole learning experience full circle. That last one was the biggest deviation from the reference design, which meant it took a little fiddling to get right. The USB-C powered board uses an ARM i.MX 6ULL processor and features DDR3, NAND flash, and an Ethernet interface. His incredibly detailed write-up of the experience and lessons learned along the way has emboldened other brave souls to take up the challenge. To those who’ve been keeping an eye on this sort of thing, it will probably come as no surprise to hear was inspired by the work of, who arguably kicked off this whole trend when he put together a bevy of homebrew Linux boards in an effort to compare different System-in-Package ICs. Creator tells us the only goal when developing CATFOOD (yes, that’s the name) was to gain confidence with at-home board production, so it looks like a success to us. While it would have seemed all but impossible a few years ago, we’re happy to report that yet another dedicated hardware hacker has managed to spin up their own custom Linux single-board computer. It’s truly incredible what the hobbyist is now capable of.

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