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by Tafkas
Thu Sep 01, 2016 9:50 am
Forum: Deutsch
Topic: Amazon Dash-Buttons jetzt in Deutschland verfügbar
Replies: 0
Views: 731

Amazon Dash-Buttons jetzt in Deutschland verfügbar

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...
by Tafkas
Thu Feb 19, 2015 12:41 pm
Forum: Automation, sensing and robotics
Topic: SolarPi – A Raspberry Pi powered photovoltaic monitor
Replies: 1
Views: 1602

SolarPi – A Raspberry Pi powered photovoltaic monitor

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...
by Tafkas
Sun Jan 11, 2015 6:29 pm
Forum: Automation, sensing and robotics
Topic: Photovoltaic/solar systems monitoring
Replies: 124
Views: 73677

Re: Photovoltaic/solar systems monitoring

I put a first version live at http://solarpi.tafkas.net

I will do a little write-up about everything in the near future.
by Tafkas
Mon Dec 22, 2014 3:06 pm
Forum: Automation, sensing and robotics
Topic: Create into database with python
Replies: 14
Views: 5046

Re: Create into database with python

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.
by Tafkas
Mon Dec 01, 2014 10:24 am
Forum: Automation, sensing and robotics
Topic: Logging temperatures using RRDTool and Highcharts
Replies: 68
Views: 78137

Re: Logging temperatures using RRDTool and Highcharts

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

Code: Select all

socat /dev/ttyUSB0,B9600 STDOUT
on the command line?
by Tafkas
Fri Oct 31, 2014 11:30 am
Forum: Python
Topic: Scraping weather and temperature from openweathermap JSON
Replies: 2
Views: 9145

Re: Scraping weather and temperature from openweathermap JSO

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_...
by Tafkas
Tue Oct 28, 2014 3:27 pm
Forum: Automation, sensing and robotics
Topic: wireless temperature sensor
Replies: 20
Views: 99462

Re: wireless temperature sensor

Does Xively still provide that service?
by Tafkas
Sat Oct 25, 2014 3:51 pm
Forum: Automation, sensing and robotics
Topic: Photovoltaic/solar systems monitoring
Replies: 124
Views: 73677

Re: Photovoltaic/solar systems monitoring

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...
by Tafkas
Fri Oct 24, 2014 10:03 pm
Forum: Automation, sensing and robotics
Topic: Monitoring gas/water/electricity
Replies: 10
Views: 6111

Re: Monitoring gas/water/electricity

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.
by Tafkas
Wed Oct 22, 2014 10:33 pm
Forum: Automation, sensing and robotics
Topic: Logging temperatures using RRDTool and Highcharts
Replies: 68
Views: 78137

Re: Logging temperatures using RRDTool and Highcharts

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 ...
by Tafkas
Tue Oct 21, 2014 2:32 pm
Forum: Deutsch
Topic: xml seite mit raspberry auslesen und werte per udp ausgeben
Replies: 1
Views: 941

Re: xml seite mit raspberry auslesen und werte per udp ausge

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
by Tafkas
Tue Oct 21, 2014 2:15 pm
Forum: Deutsch
Topic: Temperaturaufzeichnung mit RRDTool und Highcharts
Replies: 0
Views: 1555

Temperaturaufzeichnung mit RRDTool und Highcharts

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...
by Tafkas
Sun Oct 19, 2014 4:08 pm
Forum: Automation, sensing and robotics
Topic: Photovoltaic/solar systems monitoring
Replies: 124
Views: 73677

Re: Photovoltaic/solar systems monitoring

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/
by Tafkas
Sun Oct 19, 2014 2:51 pm
Forum: Automation, sensing and robotics
Topic: Home energy metering monitoring
Replies: 3
Views: 1411

Re: Home energy metering monitoring

That looks nice. I put something together myself. So far I can just provide a little sneak peak though: http://pi.tafkas.net/photovoltaic/
by Tafkas
Wed Oct 15, 2014 4:12 pm
Forum: Automation, sensing and robotics
Topic: smartmeter + watermeter
Replies: 3
Views: 2822

Re: smartmeter + watermeter

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...
by Tafkas
Sat Sep 13, 2014 3:06 pm
Forum: Automation, sensing and robotics
Topic: Home energy metering monitoring
Replies: 3
Views: 1411

Re: Home energy metering monitoring

Nice. I am working on a similar project: A Raspberry Pi photovoltaic monitoring solution
by Tafkas
Mon Aug 25, 2014 9:13 pm
Forum: Python
Topic: A python package for working with a Piko inverter from Kosta
Replies: 0
Views: 419

A python package for working with a Piko inverter from Kosta

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.
by Tafkas
Wed Jun 04, 2014 1:18 pm
Forum: Automation, sensing and robotics
Topic: Logging temperatures using RRDTool and Highcharts
Replies: 68
Views: 78137

Re: Logging temperatures using RRDTool and Highcharts

Yes, unfortunately DynDNS has canceled their free tier. I now host in on my own (sub-)domain at:

http://pi.tafkas.net/temperatures

It is still running on the RPi though.
by Tafkas
Mon Feb 03, 2014 7:59 pm
Forum: Automation, sensing and robotics
Topic: Monitoring water temperature in copper pipe.
Replies: 18
Views: 19658

Re: Monitoring water temperature in copper pipe.

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 ...
by Tafkas
Thu Jan 30, 2014 5:29 pm
Forum: Automation, sensing and robotics
Topic: Monitoring water temperature in copper pipe.
Replies: 18
Views: 19658

Re: Monitoring water temperature in copper pipe.

Have you considered using a JavaScript library to render the charts? I did a write up on how to chart RRD-Tool data using the HighCharts library.
by Tafkas
Mon Nov 04, 2013 12:49 am
Forum: Automation, sensing and robotics
Topic: 1-Wire Sensor using Database
Replies: 3
Views: 2975

Re: 1-Wire Sensor using Database

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.
by Tafkas
Wed Jul 17, 2013 11:00 pm
Forum: Automation, sensing and robotics
Topic: Logging temperatures using RRDTool and Highcharts
Replies: 68
Views: 78137

Re: Logging temperatures using RRDTool and Highcharts

What do you mean by "the generated xml files are not accessible"? Your JavaScript does not find them?
by Tafkas
Sat Jun 22, 2013 10:16 am
Forum: Automation, sensing and robotics
Topic: Logging data to a web server
Replies: 17
Views: 38705

Re: Logging data to a web server

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.
by Tafkas
Sat Jun 15, 2013 9:38 pm
Forum: Automation, sensing and robotics
Topic: Temp monitoring, as shown at Cambridge Jam
Replies: 3
Views: 2317

Re: Temp monitoring, as shown at Cambridge Jam

Have you considered using a JavaScript library to render the charts? I did a write up on how to chart rrd-based data using the HighCharts library.
by Tafkas
Thu May 30, 2013 12:35 pm
Forum: Automation, sensing and robotics
Topic: Temp sensing
Replies: 2
Views: 799

Re: Temp sensing

Check out my temperature sensing project: http://pi.tafkas.net/temperatures/

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