Der Graph von Dezibert

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Upgrades für Dezibert: Ein Graph.

Echtzeitstatistiken mit einem Canvas-Element, welches sekündlich mit Daten gefüttert wird. Und wenn‘s dann zu laut wird, und der Finger sich hebt – dann hebt auch der Graf dank einer CSS3-Transition seinen Finger:

Ich hatte ja vor kurzem smoothiecharts.org entdeckt, und da hat‘s mich einfach gejuckt, sowas für den Geräuschpegel unserer Arduino-Installation zu machen.

Nur war das nicht so einfach. Die Ethernet-Schnittstelle von Arduino ist alles andere als stabil. Maximal 4 Sockets, Verbindungen, die nicht sauber getrennt werden, Bugs im Firmwarecode… Es wurde einige male spät am Abend, und ich habe etliche Möglichkeiten durchprobiert. Die Schnittstelle stürzte nach ca. 1h immer wieder ab.

Die Lösung des Problems ist dieser Dreizeiler:

Heisst soviel wie: „Solange du verbunden bist, trenne die Verbindung!“.
3 Zeilen Code, und der Sauhund läuft stabil. Endlich.

Netter Nebeneffekt: Ich kann aus den gesammelten Daten auch schöne RRD-Diagrämmli erstellen:


Das war der Geräuschpegel von gestern. Um 6:30 kam die Putzfrau mit dem lauten Staubsauger. „Ob das ein Alkoholtest sei, wenn ich beim Dezibert ins Mikrofon blase…“ – Nein, das Teil misst nur die Lautstärke. Unruhe am Morgen, Mittag… Und grosse Diskussionen um 17:30.

Interessant, was so scheinbar harmlose Daten wie „Lautstärke über die Zeit“ plötzlich aussagen können…

Links:
Der Graph von Dezibert
RRD-Diagramm der letzten 12h (stündlich aktualisiert)