Data Rendering by Blynk App

1)Thanks for this wonderful way of gathering and monitoring data.

2)I am new to Blynk, and this might be an obvious question! Is there a way to choose another method for rendering the history data in the Blink App?

I am looking for another way to see the history data, for the longer time spans, i.e day, week, month.
What I observe at the moment is the following: In 6 hour mode the signal looks like raw signal, with every glitch displayed, which is good. Beginning at 1 day and upwards, it looks like data is being averaged over some time quantum and looses its delineation, which is not so useful imho.

I am looking for a data compaction/rendering scheme that would not average, but rather take the min-max of all raw values of the horizontal time span of ONE pixel and draw it as a vertical stick at the H position of this pixel.
I can elaborate more on this concept, provide code or write it myself, but as I am new to this IDE, I have no idea where to start modifying the Blynk App. :slight_smile:

Many examples here: in the various images of signals.

Thanks++ Roland

First of all, you can’t modify the app. This is done by the Blynk developers and the source code is not in the public domain.
The developers are currently working on Blynk V2, so no development is really being done in the current version. The Superchart widget is fairly new anyway, so isn’t likely to get changed anytime soon. The answer therefore, at least for the foreseeable future, is that you need to work with the existing functionality.

Have you looked st the high resolution and standard resolution display settings:

You should also read this:

especially the bit towards the end of the Superchart section that talks about granularity.


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Hi Pete,

1)Thanks++ for your reply

2)Understood, app is not public.

3)Superchart widget settings appear to be the answer, thanks for pointing this out. Knowing the very name of the widget I will also be able to browse the community forum for additional infos.

4)Then, educating myself by looking at the web, it seems that these settings are accessed via … (dot dot dot) at the bottom right of each chart:
//** image removed, only 1 image allowed

5)However they … do not appear on the app I am currently looking at:

6)Discussing this with the system developer (who setup this remote temperature monitoring system in an alpine cabin), he surmises that this access is only given to the developer and not the invited guests? (which I am) to avoid everyone tweeking the settings. Is this correct?

7)Furthermore he only gets 2 options when accessing the … (dot dot dot) Export to CSV and Erase Data
So how could he access the additional settings for the SuperChart widget?

Thanks again.


The settings in the screenshot I posted are accessed when the app is in stopped mode. If you’re using a shared copy of the app then you may not have access to stop the project. With full access it’s done using the square Stop button in the top right hand corner of the app.

If the “system developer” is packaging this as part of a commercial package then he should have a Blynk paid subscription and should be obtaining support direct from Blynk and not via this forum.


Hi Pete,
Thanks for your feedback, especially the “Stop” issue.
Before being able to continue I need to clarify the licensing situation with the experts who started using Blynk.
We are not using this system as a commercial package, but as a tool to remotely operate a remote alpine hut with volunteers. So I am not exactly sure as to what this qualifies us for.


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Hello. The rule is pretty simple. If you get the money for what you provide - this is commercial use. If not - it is free and you don’t have to pay anything.

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Hello Dimitri,

Thanks for your reply. No, we are not getting money for the temperature monitoring system. Once finalized, the intention is that 2 or 3 persons can remotely monitor the cabin and decide when to drain the pipes or whatever needs to be done.
I also checked with the person who setup Blynk initially, and we did not pay anything.
So I will assume we are OK with this free setup at this stage.


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Hi Pete,
At this point I would like to thank you for your help above, attached images and links. By simply changing the resolution we got far more useful renderings of the temperature data for the cabin.
I am trying to attach an example AFTER adjusting resolutions in the SuperWidget.

The next step for us will probably be to export the data, i.e. 4 month and study it on a larger screen then just the mobile screen. I wish I could install blink on a laptop, but it seems to be outside the business model.

In any case thanks again.

Roland Gamper

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