Seit heute gibt es die Amazon Dash-Buttons bei Amazon.de In den USA gab es die ja schon eine Weile und Leute haben die zweckentfremdet um günstig an WLAN-Knöpfe zu kommen. Jetzt überlege ich, ob ich mir nicht auch ein oder zwei bestellen soll. Ein möglich Projekt wäre http://www.instructables.com/id...
A friend of mine had a photovoltaic system (consisting of 14 solar panels) installed on his rooftop in 2013. After a little talk I offered to setup a monitoring solution which provides him the data in real-time. At its core there is the dashboard containing all interesting metrics: http://i.imgur.co...
Does it have to be an external hoster? You could set up a SQLite database on your RPi. This leaves a way smaller footprint in terms of memory. Also everything is located in a single file which makes backups very easy.
As long as you don't have many concurrent writes SQLite is the way to go.
It sounds like your rddtool db does not contain any values. If you cannot get the data with socat you do not receiving any data. What happens if you just run
Here is little script I put together to get weather data from openweathermap for my solar monitoring project . I call the script every 15 minutes using crontab: """ Created by Tafkas on 2014-07-28. """ import sqlite3 import json import urllib import time import datetime import calendar WEATHER_DATA_...
Sure. The goal is to have a Raspberry Pi photovoltaic monitoring solution . The idea is to frequently fetch data from an inverter and store it in a little database on the Raspberry Pi. Therefor I have written a library that provides a clean interface for accessing the inverter ( Pikopy ). The next s...
I put a photovoltaic/solar systems monitoring together myself. So far I can just provide a little sneak peak though: http://pi.tafkas.net/photovoltaic/
Next steps is reading the meter and calculate the amount of electricity sold and bought.
The only issue that I have is that I don't see any charts. What browser do you use? In Chrome you can check the developer tools and in Firefox you could install the Firebug extensions. If you reload the page it give you the JavaScript error that would result in the chart not rendering. Check out a ...
XML kannst du gut mit einem kleinen Python Skript und lxml parsen. Das sind nur ein paar Zeilen. Etwas ähnliches habe ich in Form einer Library gemacht: https://github.com/Tafkas/KostalPikoPy
Ich verwende meinen ersten RaspberryPi zur Aufzeichnung von Temperatur und Luftfeuchtigkeit in meiner Wohnung. Die Ergebnisse stelle ich dann mit einer JavaScript (HighCharts) library grafisch dar: http://i.imgur.com/Ltn24z5.png Falls ihr selber schauen wollt, findet ihr das Projekt unter: http://pi...
I put a photovoltaic/solar systems monitoring together myself. So far I can just provide a little sneak peak though: http://pi.tafkas.net/photovoltaic/
Cool idea. I am thinking of turning my traditional meter into a smartmeter. What do you use to generate the charts from the rrdtool database? The built-in functionality? One drawback of that approach is, that the generated charts do not look very appealing. Another reason to avoid pre-generated grap...
I am planning to monitor a photovoltaic system using my RaspberryPi. Therefor I created a library with python to fetch the data from from the inverter: PikoPy.
Once I have collected enough data I will also show the application in action.
I have found that gnuplot is fairly light on computing power - it takes less than 3 seconds to create a 3-series chart with 288 data points per series. The output is a completed graphic (I chose png), on one of my Pi web servers. I don't know how other charting software such as HighCharts compares ...
Interesting idea. Instead of a MySQL db i would recommend rrd-tools. I used a similar approach for recording temperatures in my appartment. The charts are generated on the client side using JavaScript. I also wrote a summary of how I did it.
It did pretty much what you are planning. Instead of a MySQL db i would recommend rrd-tools. I used a similar approach for recording temperatures in my appartment. The charts are generated on the client side using JavaScript. I also wrote a summary of how I did how I did it.