Tag Archives: hardware

Computer Vision and Robotics Demo with Raspberry Pi

SetupThis spring, I spent some time at SAP’s commercial hackerspace. I wanted to explore how computer vision can be used with embedded devices and robotics. I built a demo that can detect QR codes and similar symbols and point a laser at them. Possible applications of this are putting QR codes on objects to help the robot locate them and grab or manipulate objects. Another possible use case is local navigation. A robot could infer its own location and orientation in space by detecting QR codes with known locations.
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Connecting my fish tank to the Internet of Things – Part 1: Hacking an automatic fish feeder

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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. Continue reading

Arduino-Wetterstation mit Bluetooth, Datalogging und Android-App

WetterstationDie 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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