Netgear Arlo – komplett kabellose Überwachungskamera

Ein gravierender Nachteil für ein Sicherheitssystem mit Kameras ist das selbst Wifi Kameras Strom benötigen und damit mindestens ein Kabel. Für Aussenkameras ist dies meist ohne aufwendige Installation und bohren durch die Hausdämmung nicht getan. Allerdings ist eine Lösung von Netgear auf dem Markt die ich heute endeckt habe.

Arlo heisst das System von Netgear und ist eine Lösung die mit 4 Stück CR123 Lithium 3-volt Batterien betrieben wird.

Als Laufzeit gibt Netgear bis zu 6 Monaten an, was je nach Temperatur auch weniger sein kann.

VMS3230

(c) http://arlo.com/en-us/products/kit/VMS3230.aspx

Bei Amazon.com gibt es auch Rezessionen die genau dies beschreiben und ebenfalls einen Hinweis das die Laufzeitberechnung in der Software ungenau ist und das daran bereits vom Arlo Developer Team gearbeitet wird.

Die Kameras sind wetterfest, benötigen aber eine zusätzliche Basisstation. Diese ist laut Hersteller notwendig um den Verbrauch der Kameras niedrig zu halten.

http://arlo.com/en-us/

 

 

 

DIY – how to make graphene

“ One definition given in a recent review on graphene is:

Graphene is a flat monolayer of carbon atoms tightly packed into a two-dimensional (2D) honeycomb lattice, and is a basic building block for graphitic materials of all other dimensionalities. It can be wrapped up into 0D fullerenes, rolled into 1D nanotubes or stacked into 3D graphite.

A previous definition is:

A single carbon layer of the graphitic structure can be considered as the final member of the series naphthalene, anthracene, coronene, etc. and the term graphene should therefore be used to designate the individual carbon layers in graphite intercalation compounds. Use of the term „graphene layer“ is also considered for the general terminology of carbons.“

http://en.wikipedia.org/wiki/Graphene

Graphene transistor

lossy-page1-1280px-Nobelpriset_i_fysik_2010.tif

http://en.wikipedia.org/wiki/File:Nobelpriset_i_fysik_2010.tif

 

 

DiveDuino – DIY dive computer

“ What is DiveDuino?

Right now Diveduino will not replace your dive computer, but it can log your depth and temperature during your dive, saving it to a MicroSd Card in a TEXT file format so you can import it to excel and do your fancy dive profile graphics, no need of special $100 USD cables that all the diving equipment manufacturing companies sell. Plus it has a display for that information with a actual graph of your dive profile.How it came to my mind?

DiveDuino came to my mind since I am an active diver and I enjoy the sport. I am an electrical engineer and at work I came across with the Arduino platform. Dive computers are expensive, if you want all the fancy features, you can find some computers for about $150 USD and others for about $1500 USD. Every basic dive computer has this indicators: No Decompression Limit(NDL), depth, temperature and elapsed time. So why not create something with the help of the Arduino open source platform, I found a sensor that could interact with Arduino and the rest is the prototype that I am building.“

http://www.diveduino.com/

Project is still fund raising at Kickstarter http://www.kickstarter.com/projects/1454384970/diveduino-diy-dive-logger?ref=ending_soon

Make a slim watch with ARM Cortex-M3 EFM32

Hack-a-Gecko project by Anders and Adam 

How to make a very slim watch and keep battery life long? In this Hack-a-Gecko project, they tried to catch two birds with one stone.

The Idea
We thought it would be cool to utilize the extremely low power EFM32 in combination with an extremely low power display to create a wrist watch demo application. And usually, the smaller and thinner something is, the cooler it is. (Admittedly, wrist watches do not necessarily follow this trend… big watches.)

Anyway, we wanted it slim. The starting point was the memory LCD display from Sharp (link). It is truly a Nano ampere display technology. And it is also thin, only 0.75 mm. A watch also needs a battery, cool new technologies exist such as the Thinergy battery, but the voltage of 4.1 V is a bit awkward. We decided to use a standard 3.0V CR1616 cell as it can power the EFM32 and display directly. Thickness of battery + display is 2.35 mm, is it possible to design the electronics as well within this thickness limit…? Challenge accepted!“

http://blog.energymicro.com/2012/12/12/make-a-slim-watch-with-arm-cortex-m3-efm32/

found via http://hackaday.com/2012/12/12/super-slim-wristwatch-build/

iPhone RFID with ID-12

That’s cool, on http://blog.section9.co.uk/2010/03/iphone-rfid-reader.html you can see the work process  in pictures. The RFID chip is from http://www.id-innovations.com/new%20launch.htm.

„The idea behind this project is to see what the iPhone’s serial is capable of and to try and have a little fun with RFID along the way. This reader works with the low frequency (125Khz) tags but I have a half working version for MiFARE Hi-Frequency as well.“

DIY – The cheapest dual trace scope in the galaxy

It has 2 analog inputs and can supply 5V ont the 4 pins header on the right. One of the inputs can be scaled down with the trim pot.
The firmware in the Tiny45 is written in C and compiled with Winavr and usb source code from obdev. As you can see, there is no crystal , the software sync the internal 16.5Mhz pll clock with the USB clock.

The cost with a home made pcb is around 5€.
Of course, do not expect 1Gs/s HID does not alow that data rate !
But it is using a 10bits AD.“

http://yveslebrac.blogspot.com/2008/10/cheapest-dual-trace-scope-in-galaxy.html