{"guid":"dc99fad2-ffd7-568d-a5b3-a02c23f7f340","title":"Wie lange ist noch grün? Ampelphasen per WLAN empfangen","subtitle":"","slug":"2026-661-wie-lange-ist-noch-grun-ampelphasen-per-wlan-empfangen","link":"https://talks.mrmcd.net/2026/talk/UQQS9C/","description":"Immer mehr Städte statten ihre Kreuzungen mit C-ITS/ V2X aus und senden damit die aktuellen Signalphasen inkl. Prognosen über die Schaltzeitpunkte frei verfügbar aus.\r\nWie wäre es also eine Anzeige auf dem Fahrrad zu haben wie lange noch Rot bzw. Grün ist?\r\nMit einem ESP32-C5 ist es möglich.\r\n\r\nWie von opentrafficmap.org demonstriert können diese Daten mit einem ESP32-C5 zu geringen Kosten empfangen werden.\r\nStationäre Anzeigen wie der Leezenflow in Münster oder die Säulen an der Rothenbaumchaussee in Hamburg sind zwar für einzelne Bereiche mit hohem Verkehrsaufkommen nett, aber eine Anzeige für alle ausgestatteten Kreuzungen wäre besser.\r\n\r\nBislang waren Empfänger für C-ITS-Daten nur zu hohen Kosten verfügbar, weil standardkonformes Senden insbesondere mit den Anforderungen für die Signaturen sehr komplex ist.\r\nFür einen reinem Empfang reicht aber auch ein ESP32-C5, der deutlich besser für Akku-Betrieb in einem kleinen Formfaktor z.B. auf dem Fahrrad geeignet ist.\r\n\r\nDie Herausforderung liegt in den teils obskuren Datentypen, die in den ITS-G5-Standards verwendet werden. Und in der Komplexität von ASN.1 an sich.\r\n\r\nFolgt mir auf eine Reise durch Kreuzungstopologien (MAPEM) und Signalphasen (SPATEM) und was notwendig ist um ein kleines Problem beim Fahrradfahren durch die Stadt zu lösen.\r\n\r\nFolien: https://jbeyerstedt.de/publication/mrmcd26-cits-fahrradampeln.pdf\r\n\r\nhttps://creativecommons.org/licenses/by-sa/4.0/","original_language":"deu","persons":["jtbx"],"view_count":1256,"promoted":true,"date":"2026-09-13T12:40:00.000+02:00","release_date":"2026-09-13T00:00:00.000+02:00","updated_at":"2026-09-19T17:45:05.488+02:00","tags":["UQQS9C","2026","mrmcd26","Infrastructure and Software","Freiraum - C120","mrmcd26-deu","Darmstadt","mrmcd26","Day 3"],"length":2949,"duration":2949,"thumb_url":"https://static.media.ccc.de/media/conferences/mrmcd/mrmcd26/661-dc99fad2-ffd7-568d-a5b3-a02c23f7f340.jpg","poster_url":"https://static.media.ccc.de/media/conferences/mrmcd/mrmcd26/661-dc99fad2-ffd7-568d-a5b3-a02c23f7f340_preview.jpg","timeline_url":"https://static.media.ccc.de/media/conferences/mrmcd/mrmcd26/661-dc99fad2-ffd7-568d-a5b3-a02c23f7f340.timeline.jpg","thumbnails_url":"https://static.media.ccc.de/media/conferences/mrmcd/mrmcd26/661-dc99fad2-ffd7-568d-a5b3-a02c23f7f340.thumbnails.vtt","frontend_link":"https://media.ccc.de/v/2026-661-wie-lange-ist-noch-grun-ampelphasen-per-wlan-empfangen","url":"https://api.media.ccc.de/public/events/dc99fad2-ffd7-568d-a5b3-a02c23f7f340","conference_title":"MRMCD 2026 - 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