Bike-TSL-Kit now is ready and we are looking forward to see you at Open Fest Workshop.
As always the workshop will be free to participate.
Do not forget to book kit by e-mail to info@olimex.com for Open Fest Workshop, as we will have just 100 kits for the workshop.
If you have soldering iron, twizzers and cutters take them with you as we will provide 6 sets, but previous workshops proven there will be long tail of people wanting to participate/solder and having soldering tools will spare you the waiting.
Here is small video clip how Bike-TSL-Kit works when assembled:
We are looking forward to see you there and have fun together!
The Open Source Hardware Association OSHWA.org choose October 2019 to be month of the OSHW. The idea is to have events all around the world which to popularize Open Source Hardware.
Here you can see the full list of registered OSHW events you may find interesting event in your country.
On October 19th in Plovdiv is the Open Source Day. It will be held at SiteGround and starts 11.00.
Come to learn about:
What is Open Source Hardware;
How to design electronic boards with KiCad;
How to prepare your files for PCB production;
Where to source your components from EU/USA/China;
How to assembly your boards;
How to certify your project as OSHW;
How to organize crowdfunding for your OSHW project production;
As all other events organized by TuxCon, SiteGround and Olimex this will be free to participate.
RuseConf is part of IT-Tour. Every year IT-Tour organize conferences in Sofia, Plovdiv, Varna, Ruse, Burgas, Veliko Tarnovo. They are all made by volunteers and completely free to participate. The idea is to encourage local IT community to share ideas and interesting talks.
This weekend on 28th of September was RuseConf and Olimex presented there our newest NB-IoT boards.
NB-IoT-DevKit boards will be on our web for sale next week with sale price per one unit EUR 18.00. They employ the NB-IoT technology which uses existing LTE 4G network to implement LPWAN.
The NB-IoT devices use low power and can operate on battery for 10 years if network traffic is less 200 bytes per day (this may seems small but SigFox for instance allow 2 to 140 uploads of 12 bytes messages per day. NB-IoT has no restrictions and limits, but if have to be careful as more traffic means more battery discharge. One GSM LTE base cell can connect up to 100 000 NB-IoT devices at same time ( but of course it no one talk on his GSM phone in this cell range) which beats LoRa gateway maximal theoretical 49 connections. Also the NB-IoT module we use has +20dB more sensitivity so if normally one Base cell can connect to NB-IoT nodes up to 10km this module has 10 time more sensitivity and can connect up to 100 km from the base cell. This of course is marketing claim theoretical claim as explained in the talk but still impressive.
The slides are in Bulgarian and English and uploaded at Slideshare.com
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 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.
and back side:
it comes with pair of switches which allow you to activate left and right side lights.
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 🙂
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.
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:
and bottom of the board:
this effectively removed all noises and the A20-OLinuXino-LIME2 pass CE requirements:
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.
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.
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