Using a buzzer with Arduino in pure C

October 15, 2014

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Arduino UNO connected to KEPO buzzer

Since one of my most viewed posts is Programming Arduino Uno in pure C, I wanted to write other posts about common Arduino functionalities implemented in C instead of the default language. In my experiments I use a Debian computer with avr-gcc compiler. This time I’m using a buzzer that I bought at an electronics fair. […]

Posted in: Hardware

Fake Dawn app updated, and thoughts about Android API backward compatibility

October 12, 2014

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Fake Dawn feature image

Some time ago I wrote an Android app called Fake Dawn, mainly to learn about the basics of Java development on Android, and also to implement something that I can use everyday: an alarm that wakes you up gently by gradually increasing the volume and the light in a customizable way. I collected the things […]

Posted in: Software

Eric S. Raymond: Time, Clock, and Calendar Programming In C

October 9, 2014

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esr (of The Cathedral & the Bazaar fame) has just written a comprehensive guide on the many functions, structures and styles for dealing with time in C, mostly for UNIX, Linux and POSIX operating systems. It’s especially direct in marking obsolete functionalities, stuff that shouldn’t be used, pitfalls and recommendations. I’m sure he struggled with these APIs […]

Posted in: Software

Google announces Android One

September 15, 2014

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The Nexus products are meant to be the flagship of Android smartphones and tablets, implemented at the state of the art, powerful enough to display all the latest features and efficient enough to have a decent battery life. Android One aims to be the smartphone of the masses, much like Nokia GSM phones were at the […]

Posted in: Hardware

Debian jessie XFCE hang on login [solved]

September 7, 2014

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openlogo-100

Today I had a nasty surprise when turning on my computer: when I tried to login, it hanged while closing the login screen, and my desktop didn’t appear. So I started troubleshooting. Using Ctrl-Alt-F1 I tried to login from text console, and it worked. From there, I was able to run a desktop session with […]

Posted in: Software

A story of Gmail war on spam, and plans for end-to-end encrypted mail

September 6, 2014

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Mike Hearn is a security expert that worked on prevention of spam and abuse at Google, and on Bitcoin-related systems. He wrote a rich but clear mail that gives a good perspective on the effort that email providers must pay to be able to fight spam effectively: Modern anti-spam and E2E crypto (via reddit.com/r/programming). The essay […]

Posted in: Security

HowTo setup A20-OLinuXino-MICRO RootFS on SATA and ownCloud

August 20, 2014

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Originally posted on olimex:
fromcologne posted on our forum interesting tutorial how to setup rootfs on SATA drive and to setup your own cloud service with A20-OLinuXino-MICRO. Now you can keep all your work files, pictures, movies to your own Cloud storage service and have access to them via your phone, laptop, tablet etc devices. Good…

Posted in: Software
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