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How to install Remix OS on the ASUS C200M Chromebook

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Remix OS(http://www.jide.com/en/remixos-for-pc) is awesome, Chromebooks(http://www.google.com/chromebook/) are awesome, so why can't we just combine the two and add awesomeness on top of awesomeness ? Turns out we can, and it's worth every penny of it !

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Reading an H21A optical interruptor switch using an Arduino UNO - The simple way that really works

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About the Arduino and the H21A optical interruptor switch

Arduino is an open electronics development platform. It is widely used to power electronics projects. There are several boards that feature different capabilities. In my case, I am using an Arduino R3.

The H21A optical interruptor switch is a common piece of hardware. It is composed of an IR led and a photoresistor.

My goal is to use an Arduino to detect when the light is interrupted. As I am a newcomer to electronics and arduino, I started by looking on the internet for information on how to connect the two.

Some examples found on the internet

I found this search result to be relevant : http://www.electroschematics.com/10494/arduino-optical-position-rotary-encoder/

However, it did not worked, maybe because I did not had the recommended resistors at hand.

My solution

The solution that I found to be working is to simply connect the output pin of the H21A to a digital input pin of the Arduino. The trick is to declare the pin as "INPUT_PULLUP", this removes the need for a pull-up resistor ! :-)

Hope this helps !

5 semaines de COBOL ( et de mainframe )

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Mon stage de 5 semaines dans les services informatiques de BNP Paribas s'est achevé vendredi dernier. Pendant ces 5 semaines j'ai découvert le mainframe, dans son utilisation réelle par des clients d'IBM. Pour ceux qui ne connaissent pas, je vais vous faire un petit rappel de ce qu'est le mainframe puis je vous parlerai de mes découvertes pendant ce stage. Notamment, le langage COBOL, les appels dynamiques en environnement CICS.

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