This is a very nice listing of site which EFF success to you buy Music no-DRM :
https://www.defectivebydesign.org/guide/audio
Unfortunately many of these sites are not available for Brazil and other countries.
Month: July 2013
Quando usar “replaced by” e “replaced with”
No post anterior eu fiquei com duvida na frase:
“The Arduino CNC Shield could be replaced with …”
Eu fiquei em duvida se deveria usar “replaced with” ou “replaced by”, entao aqui vai a explicacao:
Use “replaced with” para algo que nao aconteceu ainda, como na frase acima.
Use “replaced by” para algo que ja’ aconteceu, que ja’ foi substituido.
Fonte: http://answers.yahoo.com/question/index?qid=20080717050158AAZUZIf
How to create an Open Source CNC
This is a nice post about how to create an open source CNC:
http://wyolum.com/shapeoko-desktop-cnc-mill-build/
This CNC uses an Arduino board with a CNC Shield. This CNC Shield could be replaced with this one:
http://blog.protoneer.co.nz/arduino-cnc-shield/
The software used to control the CNC is called GRBL and it was developed in C and could be flashed on Arduino board:
http://dank.bengler.no/-/page/show/5470_grbl
Unfortunately this software is not (yet) portable, this means it is optimized to run on AVR microcontroller only. Then it will not work directly on Raspi.
Other missing part is a graphical interface to use whit GRBL. I missed the GRBL Controller used to control and monitor it.
Update: Although you cannot run GRBL direclty on Raspi, you control the Arduino CNC from it:
http://zapmaker.org/raspberry-pi/running-grbl-controller-on-raspberry-pi/
A very nice KiCAD tutorial
So you decided to try KiCAD and want to substitute Eagle by KiCAD!?!
Good! You will find many tutorials explaining how to use it, but the best “Getting Started to KiCAD” is this one:
Hacking CSR Bluetooth BC4-EXT dongle
I like these CSR BC4 chips!
You can update its firmware to become a sniffer:
www.evilgenius.de/wp-content/uploads/2008/03/diy_bt_sniffer.pdf
You can update its firmware to become a bluetooth node to control GPIO and point to point communication:
http://pfalcon-oe.blogspot.com.br/2012/04/opensource-sensor-node-firmware-for.html
More information about these nice chip:
Flashing a new firmware:
http://byron76.blogspot.com.br/2011/09/i-hope-you-have-good-time-soldering.html
Modifying the firmware from the cheap BC4 module you bought from DX.COM :
http://www.efihacks.com/using-bluetooth-experiences-part-1/
http://www.efihacks.com/using-bluetooth-experiences-part-2/
Interactive Maps for Mobile Sites
If you are looking for an open-source maps solution to replace Google Maps with Open Street Maps then you should to know the Leaflet project:
If you want to see it in action access this page:
This is an autonomous robotic boat which will cross the atlantic from United States to Spain.
How to install Java 7 on Ubuntu (update 1.7.0_25)
Unfortunately JAVA is a necessary evil for many online banks. Then you need it to get access to Santander, Caixa and other Brazillian banks.
To install it execute the procedure explained in this page: http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html Basically we need to execute:
$ sudo add-apt-repository ppa:webupd8team/java $ sudo apt-get update $ sudo apt-get install oracle-java7-installer
You need more two steps to get java plugin working on your web browser (Firefox):
$ sudo ln -s /usr/lib/jvm/java-7-oracle/jre/lib/amd64/libjavaplugin_jni.so /usr/lib/mozilla/plugins/libjavaplugin.so $ sudo ln -s /usr/lib/jvm/java-7-oracle/jre/lib/amd64/libnpjp2.so /usr/lib/mozilla/plugins/libnpjp2.so
That is it. I hope you still praying for the day that we don’t need to use Java in our browser.
Como pagar um fornecedor chines
Atualmente é comum você comprar produtos diretamente da China, sem atravessadores, porém algumas precauções são necessárias. Sites como o Alibaba (Aliexpress) ajudam a encontrar o fornecedor de vários produtos, mas você não precisa necessariamente comprar através destes sites.
Na verdade comprando através deles você vai pagar mais caro. Quanto mais caro? Provavelmente mais de 100% mais caro, afinal elas precisam ganhar dinheiro com a exposição dos produtos a venda e como você compra em menor volume (varejo), portanto o valor final que você paga é bem mais alto.
Se você tem dúvidas sobre T/T Western Union, Paypal ou outras formas de pagamento, qual a mais segura, etc., então a leitura deste artigo é recomendada:
Este artigo em português contém alguns erros de tradução, você encontra o original em inglês neste link:
http://www.sourcejuice.com/2008/10/05/paying-your-chinese-supplier-%E2%80%93-know-your-payment-terms-and-options-in-advance/
Alan C. Assis 