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February 14, 2014
4:11 am
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luhues
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Hi all,

We are currently working in a project related with physiological signal based on human emotion recognition in which we need to store large amount of information from multiple sensors.
We are looking for a Cloud Platform to store our data sensor and Thingspeak could be a possibility. We would like to resolve some doubts:

1)If we use the online thingspeak cloud, is there any limitation on storage capacity or data processing?
2) About uploading data, could we create unlimited channels?
3) Could we upload data from multiple channels simultaneously?
4) In general, Is there any limitation on uploading or downloading data?
5) If I start using thingspeak normally and then would like to migrate to open source API and have my own server. Is there a way to get all my data?

Thank you in advance

Lucia

February 14, 2014
10:15 am
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lee

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Hi Lucia,

Here are the answers to your questions:
1)If we use the online thingspeak cloud, is there any limitation on storage capacity or data processing? No.
2) About uploading data, could we create unlimited channels? Yes.
3) Could we upload data from multiple channels simultaneously? Yes (via separate HTTP requests).
4) In general, Is there any limitation on uploading or downloading data? There is a rate limit of one update per Channel every 15 seconds.
5) If I start using thingspeak normally and then would like to migrate to open source API and have my own server. Is there a way to get all my data? Yes, you can download the data as CSV and then import it to your own server.

lee

February 15, 2014
1:18 am
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turgo

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Lee's reply above is the official word, but I have some observations about accessing historical data:

If you have a year long data set of 15 second averages, its about two million points. You can only retrieve 8000 at a time. When you do repeated requests for 8000 points, ThingSpeak delays the response. It typically is about a minute and a half. To download a years worth of data this way would take 6.5 hours, although partway in, I usually run into some error that does not let me continue. I have created a web page that loads and graphs historical ThingSpeak data, so you can try this out for yourself, and see how ThingSpeak serves the data:
http://community.thingspeak.com/forum/announcements/thingspeak-live-chart-multi-channel-second-axis-historical-data-csv-export/

I like ThingSpeak. There are practicalities to consider with large data sets.

February 17, 2014
5:39 am
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luhues
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Thanks a lot for your prompt reply, lee and turgo
Thinkspeak is a good option for my project. I'm going to try how ThingSpeak serves the data

Thank,
Lucía

March 4, 2014
4:14 am
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luhues
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Hi all,

I have a new question: If we install Thingspeak in our own server, would we have the rate limit of one update per Channel every 15 seconds?

Thank you in advance,
Lucía

March 4, 2014
11:28 am
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lee

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Hi,

If you use the open source version of ThingSpeak the rate limit is off by default, but can easily be changed here: https://github.com/other/thingspeak/blob/master/config/initializers/constants.rb#L6 .

lee

March 6, 2014
6:32 am
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luhues
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Thanks a lot, lee Wink

Lucía

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