demonstrator.md

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+# 6. Demonstrator
+
+An integral part of the [iPlat](https://embsys.technikum-wien.at/projects/iplat/index.php) project is the realization of an interactive, safety-related railway demonstrator (Figure 1). It will be used as development platform for future Bachelor and Master projects, as well as present a starting point for further R&D projects at the Department of Embedded Systems. The demonstrator is also planned to be presented to the broad public at events like the &quot;Lange Nacht der Forschung&quot; or the &quot;Open Days&quot; of the UAS Technikum Wien.
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+![demonstrator Top](./demonstrator/demonstrator-top.jpg)
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+*Figure 1 - Railway demonstrator*
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+The demonstrator consists of a model train set with three tracks, two trains, a railway station and a series of signals and switches (see Figure 2). The track plan is designed in such a way as to make collisions between trains possible. There are four intersections between various tracks, as well as four switches that allow a train to change to a different track. The signals are used to prevent collisions by indicating whether a train is allowed to proceed or should stop. They are placed before each intersection and switch, as well as at the railway station.
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+![demonstrator TrackPlan](./demonstrator/trackplan-v4.png)
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+*Figure 2 - Track plan of the railway demonstrator*
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+The demonstrator is a distributed system that consists of two submodules – the Operator PC and the Nodes – connected via Ethernet. The Operator PC provides a user interface to control the demonstrator and, in addition, presents media content, such as a live feed of the railway track. The Nodes, as seen in Figure 3, are responsible for motor, signal and switch control, as well as current measurement.
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+![demonstrator Bottom](./demonstrator/demonstrator-bottom.jpg)
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+*Figure 3 - The hardware nodes of the railway demonstrator* 
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+The demonstrator can operate in either autonomous (Scenario 2) or manual mode (Scenario 1). The control software on the Operator PC allows the user to select a scenario, and, in the manual mode only, control the train speed and change the position of the next switch ahead of the train. In the autonomous mode, the trains follow a predefined schedule under full control of the software.
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