18650 Li-Ion battery powered Wemos D1 with Wemos Battery Shield - DONE 48 days achieved

>>> For the version with a solar panel attached see this post <<<
Wemos has developed a series of shields for the Wemos D1 :
DHT Shield Battery Shield Matrix LED Shield Buzzer Shield Dual Base SHT30 Shield WS2812B RGB Shield ProtoBoard Shield 1-Button Shield Micro SD Card Shield Relay Shield DC Power Shield Tripler Base Motor Shield OLED Shield
The good thing is that you can stack them on top of another.
Let's take a look for now to the Battery Shield that is now on version 1.2.0 and it has a retired version 1.1.0
Get the schematics from here version 1.1.0 and 1.2.0 to see the differences. An immediate visual difference is the inductor on the V1.1.0...

BMP180 and wemos D1 reading temperature, pressure and altitude

To read the pressure, temperature and altitude you can use an BMP180 cheap i2c breakout.
1. Materials:
Wemos D1USD 3.99 BMP180USD 1.97 Total:USD 5.96
2. Libraries:
Install Adafruit BMP_085 libraries from Library Manager:
3. Connections:
VCC----3V3 GND----GND SDA----D2 SCL----D1
4. Code:
#include <Wire.h>
#include <Adafruit_BMP085.h>
Adafruit_BMP085 bmp;
void setup()
{
  Serial.begin(115200);
  if (!bmp.begin()) {
    Serial.println(F("Could not find a valid BMP180 sensor, check wiring!"));
  }
}
void loop()
{
  // Wait a few seconds between measurements.
  delay(2000);
  Serial.print(F("Pressure: "));  Serial.println(bmp.readPressure()/100);
  Serial.print(F("Temperature: "));  Serial.print(bmp.readTemperature()); Serial.println(F("*C"));
  Serial.print(F("See level pressure: "));  Serial.println(bmp.readSealevelPressure());
  Serial.print(F("Altitude: "));  Serial.println(bmp.readAltitude());
  Serial.println(F("----------------------------------------"));
}

Virtual Um interface between OsmoBTS and OsmocomBB

During the last couple of days, I've been working on completing, cleaning up and merging a Virtual Um interface (i.e. virtual radio layer) between OsmoBTS and OsmocomBB. After I started with the implementation and left it in an early stage in January 2016, Sebastian Stumpf has been completing it around early 2017, with now some subsequent fixes and improvements by me. The combined result allows us to run a complete GSM network with 1-N BTSs and 1-M MSs without any actual radio hardware, which is of course excellent for all kinds of testing scenarios.

The Virtual Um layer is based on sending L2 frames...

www.apertus.org: The Road from AXIOM Beta Developer Kit to Production Camera

https://invidious.privacyredirect.com/watch?v=pmJyBEiuB7c

Developer Kits have been shipping for some time now and we are aware that the most pressing question for many of you is "When will the AXIOM Beta evolve from a Developer Kit to being a production ready camera?" This article should help to answer that question, but keep in mind that the camera has been carefully designed to evolve constantly.
For a detailed itinerary of outstanding tasks and a statement on expected timeframes please see Mission Briefings on the project's Wiki.
Metal Full Enclosure The work on completing open tasks related to enclosure design is progressing well (Additional help is always appreciated...

Ten years after first shipping Openmoko Neo1973

Exactly 10 years ago, on July 9th, 2007 we started to sell+ship the first Openmoko Neo1973. To be more precise, the webshop actually opened a few hours early, depending on your time zone. Sean announced the availability in this mailing list post

I don't really have to add much to my ten years [of starting to work on] Openmoko anniversary blog post a year ago, but still thought it's worth while to point out the tenth anniversary.

It was exciting times, and there was a lot of pioneering spirit: Building a Linux based smartphone with a 100% FOSS software stack on the application processor, including all drivers,...

FOSS misconceptions, still in 2017

The lack of basic FOSS understanding in Telecom

Given that the Free and Open Source movement has been around at least since the 1980ies, it puzzles me that people still seem to have such fundamental misconceptions about it.

Something that really triggered me was an article at LightReading [1] which quotes Ulf Ewaldsson, a leading Ericsson excecutive with

"I have yet to understand why we would open source something we think is really good software"

This completely misses the point. FOSS is not about making a charity donation of a finished product to the planet.

FOSS is about sharing the development costs among multiple players, and avoiding that everyone has...

How the Osmocom GSM stack is funded

As the topic has been raised on twitter, I thought I might share a bit of insight into the funding of the Osmocom Cellular Infrastructure Projects.

Keep in mind: Osmocom is a much larger umbrella project, and beyond the Networks-side cellular stack is home many different community-based projects around open source mobile communications. All of those have started more or less as just for fun projects, nothing serious, just a hobby [1]

The projects implementing the network-side protocol stacks and network elements of GSM/GPRS/EGPRS/UMTS cellular networks are somewhat the exception to that, as they have evolved to some extent professionalized. We call those projects collectively the Cellular Infrastructure projects inside Osmocom....

GSG Interns

Please welcome the Great Scott Gadgets summer interns, Ellie Puls and Jacob Graves. They joined us at the beginning of June, and we are thrilled to have both of these bright students on our team. Ellie is a junior at CU Boulder and Jacob is a senior at CU Denver, and they are both majoring in Computer Science. They plan to write a short blog post every couple of weeks over the summer to let you know what they've been learning and what kind of projects they've been working on. Here's what they've been up to in their first couple...

Как работает лазерная рулетка: реверс-инжиниринг

Ранее в своей статье я рассказывал о том, как устроены фазовые лазерные дальномеры. Теперь пришло время разобраться с тем, как работают бытовые лазерные рулетки. Разобраться — это не просто заглянуть, что же там внутри, а полностью восстановить всю схему и написать собственную программу для микроконтроллера.
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Устранение дребезга контактов на основе вертикальных счетчиков

При разработке встраиваемых систем очень часто возникает необходимость в устранении дребезга кнопок или цифровых входов. Это можно сделать аппаратно, применив ФНЧ на входе, либо программным способом. Хорошо известен программный метод устранения дребезга одновременно на нескольких входах на основе вертикальных счетчиков. Несмотря на широкое распространение этого метода, очень часто в литературе он представлен без подробного объяснения принципа работы. Попоробуем объяснить работу вертикальных счетчиков более полно и доступно. Вам потребуется базовые знания двоичной арифметики и программирования на С/С++.

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