Alphanumeric chart in my channel | ThingSpeak API | Forum


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Alphanumeric chart in my channel
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May 8, 2018
9:52 am
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May 8, 2018
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Hi there!

I'm sending RFID Tags numbers (with alphanumeric characters) to ThingSpeak.

I was wondering why the chart doesn't show the data properly. I mean: "0F001CC96C" tag (Y Axis) at 10:25 AM (X Axis)

Best regards
David Blanco

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May 9, 2018
4:30 pm

Forum Posts: 437
Member Since:
March 7, 2017
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The thingspeak chart expects numeric, logical, or datetime type data. I think your RDID tags look like strings to ThingSpeak, which it doesn't know how to plot. You can write a matlab visualization that converts the RFID value to a integer value. The RFID specification may give a hint about this conversion, but if not, a naive number substitution might work - a=1, b=2 etc. Or if you know you are dealing with a limited number of RFID's you could index them:

You can also use all the functionality of MATLAB plots, such as with the plot() command. Have a look at the plot documentation for some other ideas. (

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