Logging temperatures using RRDTool and Highcharts

[Tafkas]

I am using my RaspberryPi to record temperatures and humidity in my apartment. After recording I generate nice charts using the HighCharts library. The result looks like this:


You can check out the project, including a little write up, at: http://pi.tafkas.net/temperatures/

Any feedback is welcome.

[cisasteelersfan]

That is really awesome! Great graphs! I'm working on setting up a temperature logger for my house. I think I'm going to use the DS18B20 temperature sensors. I'm taking calculus in school so I want to apply that by finding the slopes of the heating and ambient temperatures inside vs outside. Like see how outside temperature affects the temperature inside, see how long it takes to drop a certain temperature, etc.

One question: what theme/template is that for your website? It's very clean, I love it!

[Tafkas]

One question: what theme/template is that for your website? It's very clean, I love it!

The template is provided by Twitter Bootstrap. Either get it from them directly at http://twitter.github.com/bootstrap/ or look at http://www.initializr.com/

[lumav]

Hi Tafkas.Very nice job!.
I like very much your graphs.
I've done a similar project using DS18B20 sensors.
I've followed succesfully your guidelines up to the generation of xml's but I'm having some trouble on rendering the graphs properly through Highcharts.
I think I'm missing some code with options definitions under $(document).ready(function(). Will you be so kind to share the missing part of code to make it work.
Many thanks.

[lumav]

I found the missing code in js/chart.min.js
Graphs are coming out nicely.
Thanks!

[Tafkas]

Thank you for the kind words. I just played with the Javascript again and added a functionality that computes sunrise and sunset for the 24h, 28h, weekly and monthly chart. Then I use this information to plot vertical bands on the chart indicating the effects of the sun on temperatures (and humidities).





You can check it out at: http://pi.tafkas.net/temperatures/index.html?1w

All information are computed on the client-side at runtime.

[lumav]

Cool!!
Very nice sunrise-sunset add-on Tafkas.
I have a couple of questions for you regarding graphs.
Do you know why graphs with points over 1 hour are shown at odd hours (1.00,3.00, 5.00....) instead of even hours (0.00,2.00...)? Three months reports are shown at 1.00 and 13.00 instead of 0.00 and 12.00.
I've been trying unsuccesfully to change it. I believe is related to RRDtool and maybe UTC timing.
Another problem I've discovered is when drawing MAX or MIN graphs. I've tried with the yearly graph where just 1 point is taken for each day and it doesn't match with the expected results. Ideally the max or min temperature for a particular day (from 0.00 to 24.00) should show, but that's not the case. I guess this may be related with the starting time of the database creation which I guess also determines the intervals when max and min values are captured? THis may also be related to the previous issue.
Any clues on how to fix this?
Many thanks for your great work!

[Tafkas]

I put a Min-Avg-Max graph together real quick:


I will tune it a little bit on the weekend when I have more time.
If you want to check it out live: http://thule.mine.nu/html/lastyearminmax.html

[Hoagie]

Very cool, well done!

The USB device looks awesome, do you think it can receive data from WH1080 weather sensors? Commonly sold by Maplin in the UK... http://j.mp/YlEWmM

I had a PC recording graphs from a similar wireless weather station. However, I did it by intercepting the radio transmission and hacking the protocol. I'm looking to do it again with the Pi, but struggling to find the time. I'll post something if I ever get it going.

[kenmc]

Check out http://www.susa.net/wordpress/2012/08/r ... nd-rfm12b/ for intercepting the data directly

[Levaillant]

It's definitely awesome!

[cdjaco]

Very nicely done. Thanks for posting the write-up!

[Levaillant]

Code: Select all

       # Format data
       "{? line # 1, 1,} $" tmp = `echo | tr ',' ','`.
       data = `echo" $ {tmp% N% 0} "| sed 's / :: /: U :/ g' | sed 's / :: /: U :/ g'`
       data = $ data {%%}
       # Update rrd
       rrdtool update temperatures.rrd $ data

Sorry, there is one thing I really don't understand in your script.
Where did you set your data with the date parameter?
I think I've forget sommething...

Edit:
And I suppose you use a cron job, do you?

[Levaillant]

Ok, I finally understand the N:
rrdupdate N:value1:value2:valueN
N: means now...

[Tafkas]

Exactly. You can either specify a time in seconds since 1970-01-01 or by using the letter 'N', in which case the update time is set to be the current time.

[jschacon]

Hi Tafkas,

great project!!I would like make one similar. Do you mind tell me the reference of the weather sensors that you had used for your project? I dont find them on the elv page. Did you buy them on http://www.elv.de?


Thanks!

[Frenchy]

Hi all,

same question: Do-you have any feedback on the temperature/humidity sensors?

Which are best with Raspberry?
How many can you plug in your Raspberry?


Many thanks

[Tafkas]

I use the USB-WDE1 receiver (link) and six sensors (link).

[albundy]

Hi Tafkas,

I managed to add some DS18B20 sensors to the Pi and read the temperatures into a rrd database.
Exporting the data does also work. A cron job is filling the database every 5 minutes with sensor data.

But here ends my knowledge. I tried to figure out what to do with help of your website but was unable to produce something that worked.

I have no knowledge of ajax, java, html etc so I am lost at this point.
What do I need? Can you give me a step by step instruction what to do to get these awesome graphics?

Many thanks.

[Frenchy]

I found this exemple to log data on a website...don't know if you did the same with your sensors?


I'd like to put one sensor in each room, so usb isn't really an option. It cost a lot and isn't suposed to cover 20m...

I think the 1-wire cables are better for that purpose. But if I want to record about 5-10 sensors, I guess RPI won't be enough. I'll have to buy a shield or Arduino... How have you done that?


And do you know a good 1-wire sensor that combine temperature and humidity?...and if possible, that can be put outside?


Thanks!

[gglaspi]

Hi Tafkas,

Thank you ! I could set up the same config at home thanks to you !

I'm duplicating your http://thule.mine.nu/html/ pages for my personal use since they're just great, are you ok with this ?

[jschacon]

Hi gglaspi,

Do you mind tell me the reference of the weather sensors that you had used for your project?


Thanks!

[Tafkas]

Hi Tafkas,

Thank you ! I could set up the same config at home thanks to you !

I'm duplicating your http://pi.tafkas.net/temperatures/ pages for my personal use since they're just great, are you ok with this ?

Sure, go ahead. I basically just used the Bootstrap Framework without any alterations: http://twitter.github.com/bootstrap

[Tafkas]

Hi gglaspi,
Do you mind tell me the reference of the weather sensors that you had used for your project?
Thanks!

Check out Post 17, where I put the links of the receiver and the sensors.

[jschacon]

Hi gglaspi,
Do you mind tell me the reference of the weather sensors that you had used for your project?
Thanks!

Check out Post 17, where I put the links of the receiver and the sensors.

ok. Thanks!