S-train live frame

This physical picture frame displays the current location of all S-trains in Denmark on their routes with the WS2812B LED strips. The idea is largely based on DSB's already excisting website Byens Puls. The program pulls data from Rejseplanen which is the official journey planner for public transport in Denmark. Their open API is used to request live traffic information from their database.

How the program works

Every minute, the program sends a request for all stations on the S-train network. Each station has a unique id and is referenced from an already excisting datasheet at stations/Stogsstationer.csv, fetched from the API documentation.

Each request can only bear the information from a single station. The request is then repeated for each station until all information from all stations are extracted. Every request in answered in the xml format and is locally saved in the /xml folder. From that saved file, id, line, time and finalStop is appended to the timetable dictionary and returned as a local variable.

Example of request from API

<?xml version="1.0" encoding="UTF-8"?>
<DepartureBoard xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://webapp.rejseplanen.dk/xml/rest/hafasRestDepartureBoard.xsd">
<Departure name="B" type="S" stop="Albertslund St." time="22:01" date="01.12.20" id="8600621" line="B" messages="1" rtTrack="4" finalStop="Høje Taastrup St." direction="Høje Taastrup St.">
<JourneyDetailRef ref="http://webapp.rejseplanen.dk/bin//rest.exe/journeyDetail?ref=502704%2F192919%2F234768%2F50194%2F86%3Fdate%3D01.12.20" />
</Departure>
</DepartureBoard>

Once all departure information from all stations is locally saved in the all_departures dictionary, it is then checked whether or not the station in question has a train stopped at the platform, or if a train is arriving. The all_departures dictionary is looped through and checked if the current time - defined by the current_time variable - equals to the departure time. It is also checked if a train is arriving with the train_arriving varible, which is current_time subtracted one minute before departure. A list stations_with_train with all stations with arriving and departing trains.

From stations_with_train, all the id's are then mapped corresponding to the trainroutes from stations/train_lines.json. The final output is then a list for each of the lines with indexes as stops_index.

Examples

Final index output example

stops_index = {'a_line': [1, 32, 14, 24],
 'b_line': [10, 23, 17, 25, 16, 1],
 'bx_line': [7, 26, 14, 13, 1], 
 'c_line': [21, 14, 27, 15],
 'e_line': [11, 26, 8, 18],
 'f_line': [7, 11, 1],
 'h_line': [13, 6, 7]}

stops_index numbers cooresponds to the indexes below and each line have their own set in index numbers

Example of stops with cooresponding indexes

Physical construction

The frame is currently under construction. More pictures and build files in a future release