TERES I Do It Yourself Open Source Hardware and Software Hacker’s friendly laptop is complete

teres

We are proud to announce that our TERES I laptop is complete. We have assembled units and now working on the software.

The building instructions are uploaded here and you can see that it’s pretty easy to build one yourself.

This weekend in Bruxell at FOSDEM we will have table in Hall AW where every one could touch and play with the very first built laptops.

All spare parts are uploaded at the web.

Hardware CAD files and Linux build scripts are on GitHub. TERES I is completely designed with KiCAD FOSS so everyone can download and learn, study, edit, modify.

Hardwarewise everything is OK and works, the software need some care to be completed, power supply management, Linux distribution, and few more details need attention, but we hope everything to be complete till Friday!

GNU/Linux Install fest in Plovdiv @ Olimex on December 10th

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We will host for a first time GNU/Linux install fest.

If you have problem with some device or driver or don’t know how to tweak your Linux distribution, or just want to chat with other people who use Linux – come to us on December 10th, 11.00-14.30 o’clock and meet Linux experts who will participate this event and get free advice and help.

Where to find us? Here is Google Maps Olimex Ltd location. And here is picture of the map, the green dot is the Olimex Training building where the GNU/Linux install fest will take place:

train

 

Looking forward to meet you there.

Here is the link of the event in Facebook.

A20-OLinuXino-MICRO project – How to set up a raid 1 filesystem

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Flayol Frédéric submitted on our project page link to his interesting project, he setup Raid 1 file system with two USB Flash drives.

There are also many other interesting projects on his blog!

Our Help Day for September is this Saturday 26th of September in our training building

Help Support Advice Assistance and Guidance on a signpost

Our next Help Day is this Saturday 26/09 at 11.00 o’clock in our training building.

If you need help with your project, or you don’t know how to use some of our boards you can come this Saturday at our Help day.

We got a number of requests to make KiCAD workshop in Plovdiv like the one we did in Sofia at Hack Conf this weekend, so if you want to get familiar with KiCAD you can come on the Help day with your laptop with KiCad pre-installed and to learn how to use it 🙂

We use KiCAD extensively this year and already got more than 20 boards designed with it, so we got some experience we can share.

ESP8266-EVB support for JTAG development with flash load, breakpoints, disassembly, step debugging in Visual Studio C/C++

17-stepover

Ivan Shcherbakov @SysProgs shared interesting article. He wrote support for ESP8266-EVB to VisualGDB Visual Studio plugin for embedded software development in C/C++.

With this plugin you can use JTAG to debug code in ESP8266, also to set breakpoints, view the disassembled code etc. This adds new level for professional developing using ESP8266.

TuxCon conference – only 10 days left

tuxcon

Just 10 days left till TuxCon conference in Plovdiv!

For these who didn’t hear yet: TuxCon is a free community event about free and open-source software for Internet of Things, mobile, embedded and wearable devices.

In Saturday 11th of July there will be lectures and Lighting talks. Peter Valkov from Olimex will talk about ESP8266-IoT Firmware and six other lecturers are registered.

In Sunday 12th of July we will have Hackathon at Olimex training building including  IoT workshop with ESP8266 and SMT components soldering workshop.

The Help day for June and July will be combined with this event, so if you have questions how to use our boards or want help from our developers they will be available all day long.

Experimenting with Gas Sensors and Arduino

Sensors

We have 4 different Gas Sensors on our web shop: MQ-2, MQ-3, MQ-7 and MQ-135.

All they work on same principle: sensor element is heated and it’s conductivity change with the gas concentration.

The heater require 5V and have 31 ohm resistance, so your power supply should provide 200mA of current for the sensor.

Sensor have both analog and digital output, the analog output is 0-5V, the digital output is frequency related to the output value.

MQ-2 is sensor of LPG, Propane, Methane and Hydrogen gas and can be used for domestic gas leak alarms
MQ-3 is sensor of Alcohol and Benzine and can be used for breath analizer
MQ-7 is sensor of Carbon monoxide CO and can be used for car gases analizer
MQ-135 is sensor of NH3, NOx, Alcohol, Benzine, Smoke, CO2 and can be used for quality of air analizer

We did some experiments today with all four sensors connecting them to OLIMEXINO-32U4 (Arduino Leonardo compatible).

The sensors have 4 pins: AO – Analog Output, DO – Digital output, GND, VCC-5V

MQ-1 MQ-2

OLIMEXINO-32U4 should be switched to work on 5V.

Three wires are used: AO from sensor to A0 of Arduino, VCC from sensor to 5V, GND from sensor to GND of Arduino.

The sketch is simple:

int sensorPin = A0;
int sensorValue = 0;
void setup() {
 Serial.begin(9600);
 pinMode(sensorPin, INPUT);
}
void loop() {
 sensorValue = analogRead(sensorPin);
 Serial.println(sensorValue);
}

It reads the sensor value and print it on Serial terminal.

Note that when sensor are power up they need about 1 minute to settle, in this time the heater heats up the sensor.

We experimented with Isopropile alcohol, Benzine, Lighter Gas, human breath of two different persons 🙂

Here is the measured data:

MQ-2 normal air output  100
     Isopropile alcohol 540
     Ligther Gas        760
     Benzine            450
     Breath1            150
     Breath2            140
MQ-3 normal air output 180
     Isopropile alcohol 800
     Lighter Gas        400
     Benzine            700
     Breath1            220
     Breath2            270
 
MQ-7 normal air output  150
     Isopropile alcohol 750
     Lighter Gas        900
     Benzine            800
     Breath1            170
     Breath2            160
MQ-135 normal air output 130
      Isopropile alcohol 700
      Lighter Gas        760
      Benzine            450
      Breath1            150
      Breath2            140

the results are:

MQ-2 shows good sensibility to Lighter Gas

MQ-3 detects well Isopropile alcohol and Benzine

MQ-7 detects well Isopropile alcohol, Lighter gas and Benzine

MQ-135 detects well Isopropile alcohol, Lighter gas

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