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25 Nov 2014

20141122_00

by umn.edu :

This project is to build a portable GPS geared towards runners (well, me and what I think a runner wants a GPS thingy for). It’s sponsored by the University of Minnesota’s ECE Envision Fund.

The hardware is basically complete, and the software is functional, if not polished. This is what the main screen looks like while tracking, with another image to show scale (though you can also reference the microSD card in the images further down):

Runner’s GPS build - [Link]

25 Nov 2014

IMG_3140

by theresistornetwork.com:

I recently got my hands on a pair of Flir Lepton thermal imaging sensors and have spent the last week bringing them online in my spare time. These are absolutely incredible devices that I believe will pave the way to consumer devices incorporating thermal imaging cameras. The footprint of the camera module (and optical assembly) is about the size of a dime. The resolution is 80×60 at 14bpp which is remarkable despite sounding low.

Flir Lepton Thermal Imaging Sensor + Gameduino 2 - [Link]

25 Nov 2014

IMG_20141117_205724-600x450

Sjaak posted pictures of his password manager build in the project log forum:

I was frustrated by trying to remember my passwords for all my websites and got even more frustrated when i need to change a password again after some months. Dont even to mention the needed complexity of them nowadays. A bit insired by the mooltipass featured on hackaday, but too scared of the complexity and hugeness of it, I decided to roll my own.
Also I’m not a terrorist nor a high placed public person, so I dont need that high encrypted and bulky design. Prolly the NSA would crack this thing in a matter of days (minutes?) but I think it will keep your pr0n logins safe from your little brother ;).

Password manager - [Link]

24 Nov 2014

apps3

An app note from Atmel, digital sound recorder with AVR and DataFlash (PDF!):

This application note describes how to record, store and play back sound using any AVR microcontroller with A/D converter, the AT45DB161B DataFlash memory and a few extra components.
This application note shows in detail the usage of the A/D Converter for sound recording, the Serial Peripheral Interface – SPI – for accessing the external DataFlash memory and the Pulse Width Modulation – PWM – for playback. Typical applications that would require one or more of these blocks are temperature loggers, telephone answering machines, or digital voice recorders.

[via]

Digital sound recorder with AVR and DataFlash - [Link]


24 Nov 2014

FZLXPGWI2Q1H6GS.MEDIUM

by FabricateIO @ instructables.com:

Smart lightbulbs cost your firstborn child. Which is a shame, because smart lights unlock tremendous potential for home automation, energy savings, and all sorts of cool projects.

If only there was a way to control your lights without breaking the bank…

And now there is! For $19 on Amazon, you can get a 4-lightbulb kit from China that ordinarily is limited to 4 channels from a single remote…but with some creative hacking, can be used to control an unlimited number of channels using an arduino and a very simple RF module!

Cheap Arduino Controlled Light Sockets - [Link]

24 Nov 2014

esp8266-reflash-firmware

by marc2203 @ importhack.wordpress.com:

I’m not going to explain in detail what is ESP8266 because if you have found this post I’m sure you already know it. But just in case, it is an awesome cheap board (less than 4$) with built-in wifi communication (802.11 b/g/n), and SPI, UART. You can also use its processor to run your code.

How to use ESP8266 ESP-01 as a SENSOR web client - [Link]

24 Nov 2014

obr1627_3

Internet is “good” not only for people but also for various devices (things), what we´re experiencing on every step. And that´s only the beginning ….

Term „Internet of Things – IoT“ is known already for several years and in general it addresses connection of various devices to internet. What´s the benefit of internet connectivity for various devices, sensors and other modules? It´s quite a lot, what IoT enables, for example:

  • remote data read out, practically from any place on Earth
  • remote control
  • diagnostics, watching and early prevention of faults
  • minimizing of physical control and service intervention to a given device
  • real-time evaluation and many other

A common feature of all „IoT“ devices is, that they are uniquely identifiable. A global expansion of internet caused, that technical equipment (for example Ethernet/ serial interfaces) enabling implementation of TCP/IP Ethernet or WiFi into a target device are available for affordable prices, so it´s relatively simple and affordable to add internet connectivity into a target device. Using this connectivity we gain a possibility to use a given device in virtually any environment and any country.
Already a small, easily usable module like for example Xport is, is able to provide a TCP/IP connectivity and provides a possibility to administrate a given device through a web server.

Internet of Things should be beneficial for both – producer and also for user (or administrator) of a given device. A user is prospering from an easy data collection through a practically everywhere-available network and a producer is in many cases able to diagnose or service given device within few seconds or minutes.
One of the biggest advantages of using internet as an “interconnecting element” is a possibility of unlimited expansion of connected devices and relatively simple data processing. Many smaller but also renowned companies already today offer a software development – customized for a given IoT application.
A characteristic feature of IoT is, that generated data originate from “things”, not from human as it is so far at the majority of nowadays internet content. Direct data transfer without human intervention increases accuracy, eliminates possible mistakes and mainly – saves human work and attention.

One of many ways how to IoT enable your device is to use some of common embedded microcomputers. UDOO, Embedded Artists, BeagleBoard, Raspberry Pi, Banana Pi and many other modules provide for an affordable price a considerable computing power, wide connectivity and intelligence to a target device. Finally, a display with a touch panel in connection with such a microcomputer usually creates a user friendly (HMI) interfaces. As a result, such a device is in majority of cases much more attractive for an end user. A brief comparison of some popular embedded microcomputers can be found here.
The newest term on this field is the „Internet of Everything“, i.e. internet connecting people, processes, data and things. Perhaps only the nearest future will show a real status, which can be influenced even by you – by a design of your devices.


Are you familiar with Internet of (every) Things? - [Link]

22 Nov 2014

obr1459_1

 

Minimal power consumption, slim design and a big amount of available versions with multi-color backlight – these are some benefits of the EADOG series displays.

EADOG series is familiar to many of you and probably it´s your favorite one from these main reasons:

  • displays are unusually flat (thin)
  • the have a very low power consumption of 100-s uA (without backlight)
  • wide possibilities of backlight, monochrome and also RGB
  • some types are well legible even without backlight
  • simple communication through 4/8 bit or SPI interface and newly even I2C

So far, types with up to 128x64px or 3×16 characters were available. The most recent additions to the EADOG family are bigger types with resolution of 160x104px (EADOGXL160), 240x64px (EADOGM240), 240x128px (EADOGXL240) and 4×20 characters (EADOGM204) and appropriate backlight modules EALED66x40, EALED94x40 and EALED94x67. Also these new types maintain a low profile – only 5.8 or 6.5mm with backlighting. A positivity is that even these new types are based on standard LCD controllers.

A guide at a choice of a suitable combination of display +backlight will provide you the application described in our article – Start with the EA DOG displays for free.

Detailed information will provide you the datasheets at particular types.

Industrial applications rely on the EA DOG displays - [Link]

22 Nov 2014

In this tutorial Dave describes what AC trigger coupling is on an oscilloscope and why it can be useful. Not only on old analog CRT oscilloscopes, but modern digital scopes as well.
How and why is it different to AC channel input coupling?
Also, use of the 50% trigger control, and how the venerable DS1052E is still more usable than the new DS1054Z.

EEVblog #685 – What Is Oscilloscope AC Trigger Coupling? - [Link]

22 Nov 2014

by w2aew @ youtube.com:

Today’s “Back to Basics” tutorial topic – why flyback or snubber diodes are used around relay coils when switched or controlled by low power electronics. We’ll talk about how and why dangerously high voltages can be generated from the collapse of the stored magnetic energy in the coil when they’re switched off, and how the diode can protect the low power electronics from being damaged by these high voltages. Some voltage and current measurements are made on an actual circuit to see the real-world effects.

Why diodes are used around relay coils - [Link]



 
 
 

 

 

 

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