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Strings in Arduino IDE
Bethesda, MD
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December 13, 2016 - 6:23 pm
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From what I am seeing in the online documentation, we can write integers in the Arduino IDE using ThingSpeak.setField then ThingsSpeak.writeFields(), but can we write strings? Can we send data that doesn't need to be graphed?


Thank you,


Rob Purser
Natick, MA

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December 14, 2016 - 6:49 am
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Hi Mo,

Yes -- both setField and writeField accept both const char * and arduino String types.

See line 585 in ThingSpeak.h to see an example function signature.

ThingSpeak won't plot them (obviously), and you'll need to make sure to use the 'OutputFormat' of 'timetable' when you're working in MATLAB.


Senior Development Manager for IoT and Hardware Interfacing for MATLAB at MathWorks.  Visit to explore the IoT Analytic platform that speaks MATLAB made for engineers and scientists.  You can collect, analyze, and act in 5 minutes or less!

Bethesda, MD
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December 29, 2016 - 1:57 pm
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Hey Rob,


Thank you for your response. I am now able to send strings and read it in Matlab using timetable output format in the thingSpeakRead function, but I am unable to view the same data table in the actual channel. I have tried to use thingSpeakWrite function to write the table to another channel, but that didn't work. If I treat the table as an array and index through it, then write it to another channel, it still views it as a graph. Finally, I tried the plugin app to create a "chart with multiple series", and still got a graph.


Is there anyway I can create a table with multiple strings, and be able to view it in a table format on my Thing Speak channel?


Thanks again,


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