Raspberry Pi powered fishtank

April 3, 2015

My fishtank is now internet-connected. It is run by a Raspberry Pi that can do three things: Feed the fish, switch the lights and take pictures.

To feed the fish, the Raspberry Pi sends commands to an automatic fishfeeder that I modified. It can empty any container in any order. This is achieved by an Arduino Pro Mini, two servos and a motor (more). The plate prevents hot air from flowing into the feeder. In an early iteration of the project, this made the food sticky and kept it from falling into the tank. Switching the lights is done using a remote light switch and 433Mhz transmitter. Finally, there is a webcam that is connected directly to the Raspberry Pi to take pictures.

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Connecting my fish tank to the Internet of Things – Part 1: Hacking an automatic fish feeder

June 30, 2014

I bought a used automatic fish feeder from ebay. This device is completely mechanic and very old (older than 1989). It has 27 containers for fish food and a disc that does one rotation per day. By sticking pins into that disc one can trigger one or more feedings per day. A pin will rotate an outer ring with the containers by one unit. One container always faces down, emptying its contents. So if the outer ring has made one revolution, all containers have been emptied.

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Android-Benachrichtigungen auf dem Schreibtisch

February 16, 2014

Das Ziel dieses Projekts ist, Benachrichtigungen von meinem Android-Handy automatisch auf einem LoL-Shield (Lots of LEDs) anzuzeigen. Dazu benutze ich einen Raspberry Pi, der sowieso schon auf meinem Schreibtisch steht, einen Arduino für das Schild und auf dem Handy Tasker, um auf Benachrichtigungen zu reagieren. Sobald eine Benachrichtigung erscheint, passiert folgendes:

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BTduino documentation

July 27, 2013

The BTduino app sends data using the serial interface of a microcontroller and a bluetooth connection. The concept of the protocol is to send all data in text form. Each set of data consists of the name and the value, seperated by a colon. This way of communication is not the most efficient one, but it is easy to use and human readable.

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Arduino-Wetterstation mit Bluetooth, Datalogging und Android-App

July 9, 2013

Die Wetterdaten für die Wetterstation werden von einem Board gesammelt, das ich für einen Schülerwettbewerb (ILC) bekommen und zusammengesetzt habe. Auf dem Board rechnet ein ATxmega128A3U. Temperatur, Luftfeuchte, Luftdruck, Helligkeit, Regenmenge und Windgeschwindigkeit werden bestimmt. Die letzen beiden Werte werden durch mechanische Aufbauten ermittelt, an denen ein Magnet einen Hallsensor passiert.

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