The Open Source Hardware Linux board A20-OLinuXino-LIME2 is now supported by freedom respected Parabola GNU Linux-Libre distribution

Parabola_Gnu_Linux-libre_icon.svg

Parabola GNU Linux-libre is derived from Arch (the GNU/Linux distribution) and provides packages from it that meet the Free System Distribution Guidelines (FSDG) and replacements for the packages that don’t meet this requirement.

The goal is to provide a fully freedom-respecting GNU+Linux distribution.

We are very happy to announce that now A20-OLinuXino-LIME2 is one of the supported boards.

Open Fest 2019 is approaching,the traditional Olimex Soldering Workshop this year will be: Pimp your bike with OSHW Audi type turn signal lights

Screenshot from 2019-09-05 10-08-37

Open Fest is the biggest and most anticipated Open Source Technology event in Bulgaria!

This year it will be held in Sofia Tech Park November 2nd and 3rd.

The site already has CFP link where you can submit your proposal for talk.

Olimex submitted proposal for the traditional Soldering Workshop.

This year we prepared very interesting Open Source Hardware kit: “Pimp your bike with Audi like turn signal lights”, here is teaser. We use x5 pcs 10mm round LEDs on bothe sides, total PCB length is around 20 cm.

Screenshot from 2019-09-05 08-53-36

and back side:

Screenshot from 2019-09-05 08-54-01

it comes with pair of switches which allow you to activate left and right side lights.

Screenshot from 2019-09-05 10-23-06

This design is made purely analog, no processors, no programming. The design files will be uploaded on our GitHub account so anyone who has no chance to come can do his own version. Also we will have the kits on our web for sale after OpenFest.

On the workshop we will explain how it works, so you will learn what resistor divider is, what analog comparator is and how we achieve the Audi effect with the LEDs.

As we are preparing only 100 kits and there may be lot of people who want to participate, we solicit you to pre-register at info@olimex.com to have kit reserved.

As always our number of soldering irons are limited, so if you have your own, bring it to the workshop with you to speed up the process 🙂

Looking forward to see you at Open Fest!

 

Magic shield plates helps naked A20-OLinuXino-LIME2 board to pass CE EMC requirements.

Ax0-OLinuXino-LIME-1

A20-OLinuXino-LIME and A20-OLinuXino-LIME2 are choice for many industrial applications, when the board is inside metal box like BOX-LIME:

BOX-LIME-BLACK-1

it has no problems with shielding the radio emissions, but when just board is used as component, our customers has to shield it by their own in their designs. We had number of request to do official CE EMC certifications for A20-OLinuXino-LIME2 as this would make their life easier, and we decided to do this after we already get some experience with the certification of USB-ISO and ESP32-POE-ISO.

Initially the naked board failed on EMC measurements as seen here from the test results.

LIME2-naked

The major problem is the Gigabit Ethernet PHY. You can see spikes at 125 Mhz, 325Mhz etc. Disabling the PHY removes all noise and everything is in safe levels. So we knew who is ther trouble maker.

The major noise emitter are the Transmit and Receive clock lines. We put 33 ohm resistors in series R119 and R123 in A20-OLinuXino-LIME2 schematic , but obviously this was not enough. To further fade the line harmonics we replaced the resistors with 0402 Ferite Beads with 600 ohm impedance at 100 Mhz. This lowered the emissions, but still not well enough to be at safe levels.

So we had to make small Faraday cage on top:

LIME2-SHIELD-top

and bottom of the board:

LIME2-SHIELD-bot

this effectively removed all noises and the A20-OLinuXino-LIME2 pass CE requirements:

LIME2-1

LIME2-2

LIME2-3

LIME2-4

We are preparing now to implement the Ferite Beads on PHY Tx and Rx lines in all our other boards production assembly, and will offer the shield plates as kit they are good for A20-OLinuXino-LIME and A20-OLinuXino-LIME2 and we will prepare same for A20-OLinuXino-MICRO and A64-OLinuXino.

 

New from our forum – experimental NixOS image for TERES DIY OSHW Laptop

nixos.png

Recent post from our forum explains how to build experimental NixOS image for TERES-I  – Do It Yourself, Environmental friendly, modular Open Source Hardware ARM Laptop.

Programming with open source hardware educational board eduArdu and Scratch 3

Screenshot from 2019-07-29 14-52-10

New demo code which transforms eduArdu in Makey Makey and tutorial how to use with Scratch 3 is uploaded to GitHub.

Here is the result from above code:

New Open Source Hardware board adds SATA drive connectivity to any computer with USB host

USB-SATA

USB-SATA is board which connects to any computer with USB host and bridge it to SATA Hard disk.

The read/write speed with USB2.0 host is approx 30MB/s.

USB-SATA has USB device connector, SATA connector and power connector, when used with SATA-CABLE-SET it can drive directly SATA-HDD-2.5-500GB

It’s very convenient when you have to move large files from one computer to another you can just plug big HDD with it and use it as “giant USB Flash storage” it works faster than the USB Flash disks and can have way larger capacity.

Lime2-SD add on board for second SD card on A20-OLinuXino-LIME2

Lime2-SDa.jpg

Lime2-SD is small add on board which snaps on GPIO-1 connector and add second SD card to A20-OLinuxino-LIME2. It doesn’t interference with other parts on the board and do not increase the height.

Lime2-SD

Why we do this? Because this is an easy way to increase storage for Pioneer-FreedomBox-HSK . What we are preparing to offer soon is upgraded version of the Home Server Kit with 256GB storage made with 2 “disks” x 128GB micro SD cards. For these who already have Pioneer-FreedomBox-HSK they still can upgrade by ordering Lime2-SD .

Note that support in FreedomBox for Lime2-SD is not add, but you can try Lime2-SD with the current Armbian image for LIME2. To enable the Lime2-SD support you also have to add this dts overlay .

 

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