How to's

How to build an Electric Skateboard - Part 1 Research

  • Posted on: 12 June 2016
  • By: robin
electric skateboard

I think, 2 years ago I heard the first time about electric skateboards and I immediately wanted one. But at this time there where no good parts for mounting the motor(s). All electric stakeboards that you can buy are at least 900 Euro. I want that cheaper.

This week I even stumbled upon a Longboard at TK MAXX (or TJ MAXX) for just 70 €. Essential for this project ;-)

So I will do some reasearch and buy parts for my electric skateboard.

Magic Mirror - Turn off screen --> save energy

  • Posted on: 6 May 2016
  • By: robin

My Smart Mirror is running 24h a day. I unplug the screen at night but well that really impractical. From our server-dashboard at work (3 HD TV displaying server load, memory, cpu usage etc.) i knew that it is possible to turn off the screen programmically on the raspberry pi. I wrote a short python script which allows you to shut down the screen by calling a url.http://0.0.0.0:5511/onhttp://0.0.0.0:5511/offSolutions I had in mine.1. The one that I already presented2.

Part 1: Installing OpenCV 3.1.0 on Raspberry Pi Debian Jessy with Java Library

  • Posted on: 26 April 2016
  • By: robin
terminal  Installing OpenCV

The Raspberry Pi has become a Icon. I have nearly 10 Raspberry Pis and i love every single one of them. ;-) In December 2015 I started my Smart Mirror (Magic Mirror) Project and now its finally ready. Or better said the Hardware or the Smart Mirror is finally ready. What is now missing is a mind blowing Software. While searching for features a friend of my, Hendrik,  came up with a mind blowing idea. A absolute key feature for a Smart Mirror - Face recognition.

Capture WiFi / WLAN / 802.11 Probe Request with tcpdump

  • Posted on: 4 March 2016
  • By: robin
A Probe Request is a special type of WLAN frame sent from a terminal-device (for example your smartphone) to ask all AP nearby for their presence. This allows you to find out if smartphone or other wifi enable devices are close to you. Since many users want to use the Probe Request to identify devices:

Facebook süchtig ? Seiten wie Facebook blockieren (Mac, Windows, Linux)

  • Posted on: 29 February 2016
  • By: robin
Block Facebook

Internetseiten wie Facebook haben sich zu den beliebtesten Beschäftigung der meisten Usern entwickelt. Doch leider lenken sie uns oft ab, sodass Studium und Arbeit darunter leiden. Doch was kann man tun um von dem zwanghaften Verhalten Facebook zu besuchen wegzukommen ? Die Lösung ist einfach: Wir blocken die Seite einfach für unseren Rechner. Diese Methode ist zwar komplizierter als Browser Plugins, jedoch effektiver. Ein Browser Plugin ist schnell deaktiviert und i.d.R.

Android Vibrator pattern explained

  • Posted on: 29 February 2016
  • By: robin
Android Vibrator pattern explained

The Android Vibrator feature is supported by the majority of the android devices. It is easy to understand. First of all the feature requires premissions. So first thing you need to do is edit your AndroidManifest.xml:

<uses-permission android:name="android.permission.VIBRATE"/>

Next: The Vibrator service.

 Vibrator vibrator = (Vibrator) this.context.getSystemService(Context.VIBRATOR_SERVICE);
Now you need to define a pattern how the Vibrator should vibrate. The explaination in the Android documentation for Vibrator is:

"The first value indicates the number of milliseconds to wait before turning the vibrator on. The next value indicates the number of milliseconds for which to keep the vibrator on before turning it off. Subsequent values alternate between durations in milliseconds to turn the vibrator off or to turn the vibrator on."

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