Chart does not update correctly


I’ve just started testing your platform for a project in my company. Initially, we are simply updating 2 datastreams (temperature and waterflow). The temperature is displayed in a gauge widget in the web dashboard and updates correctly and quickly. The temperature is in a chart, and it updates with significant delay. Browser refresh does not seem to help.

If I switch to the “Latest” view it does not necessarily match the latest value in the “Last hour” graph. Sometimes it will even say “No data”. I am aware that the granularity is 1 minute, so at the moment I update the datastream less frequently.

When writing to the datastream I use the command:

Blynk.virtualWrite(V0, result);

The result variable is type uint16_t.

On a final note, I do not see the “SUM” option when configuring the chart, although it is mentioned in the help text. I only see AVG, MIN and MAX.

I hope you can help.

Best regards,



Do you mean realtime graph mode on the web console?

Hi Dmitriy,

Yes, or at least close to realtime. My main concern is the discrepancy between Latest and Last Hour, but also the fact that the chart seems to update slower than the other widget.

Is realtime an option at all?

Best regards,


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Will check. @MarkPan please take a look.