General Information
Sunrise07:38
Sunset18:06
Temp. Outside9,2 °C
Temp. Inside22,7 °C

Usages for today
Gas0,00 m3
Power0,2 kWh
Water0 L

HA Statistics
Devices 292
Device values 1723

Hot Projects

Read about them
on my web log:
Smart meter
Opentherm
Ethernet Doorbell
Audio/Video
Mantis CNC Mill
DIY Wireless Sensors
ZigBee
Arduino

Last pages added:

Opentherm Gateway
Smart meter
Nemef Radaris Evolution
Audio Video

Monitoring gas consumption

Monitoring Gas usage, that's where my domotica hobby started with, somewhere around September 2005.
This is my old gas usage chart, created in Excel:



It's not going to be used anymore, since all gas usage data is now stored in a SQL Server:

 

The big inspiration to get things going, came from the website of Pieter Knuvers,  www.bwired.nl. He explained how you could use the digits on the meter dial to detect that the meter is running with an Infrared device, an opamp and a 1-Wire counter (you can read more about his on this  page. So this would be my first "project". After a few months, around January 2006, i could read the gas meter via 1-Wire. After doing reliability tests, writing software, creating a database, having a very hot summer with little "PC-time", real monitoring started in September 2006.

In january 2007 i started creating chats of all the data i had gathered till then, cause all those numbers became too much to handle without a graphical presentation. You can see the charts here and here.
For information on how i monitor my gas usage, look here

What surprised me most, seeing these charts, was the difference in gas usage for wintertime compared to summertime. I never realised the contribution in gas usage for hot water was as small as you can derive from these charts. Nowadays, my wife and i have a little 'competition' on who uses the smallest amount of gas during their daily shower in the morning; most of the time my wife wins, but hey, i also shave and brush my teeth in the meantime, so i think i'm entitled to use a little bit more...

Now i'm waiting for the first bill to arrive from the gas-company to see the overall accuracy of the gas usage monitoring....