OPC UA in the Internet of Things

The idea of connecting things other than dedicated computing devices to the Internet is by no means new. Various examples such as remotely controlled coffeemakers or refrigerators reporting their contents have circulated for several decades, but up until recently they have been little more than anecdotal in nature. However, recently there has been a clear and growing trend for ever-increasing connectivity, dubbed the Internet of Things (IoT). In essence, the idea is quite simple – connect objects and people to enable automatic communication of data without the need for human interaction. In practice of course, it requires many new technologies to implement it. Continue reading

Source for Raspberry Pi demo released

We thought that it might be useful to show how our Raspberry Pi demo is done, so here are the sources.

As stated in previous posts, the java hardware communications are made using Pi4j library.

Most of the classes are the same as in SampleConsoleServer (sample that comes with the SDK packages). Note that depending on your SDK version the classes might not compile directly (as this was done with our SDK 2.0 beta, but they should be almost the same; if they do not compile for some reason, copy them from your SDK package). The WeatherStation.java contains the IO side of the server and WeatherStationServer.java contains the UA side.

 

Raspberry Pi demo updates

Our Raspberry Pi weather station demo has been upgraded. The system has been enclosed in a box and cables have received threaded cover layer. Two DS18B20 external temperature sensors have been added, one of them can be removed if needed (by a DB9 connector, with custom soldering). Three buttons have been added for adding interaction for exhibition visitors. Continue reading