Updating Thingspeak channel field1 with array of data

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Updating Thingspeak channel field1 with array of data

July 25, 2019
4:06 am

cmti

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Hello,

I have an array of data of length 100.Is it possible to update channel's field1 alone with array of data for every 15 sec

July 25, 2019
4:35 pm

cstapels

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The maximum for each field is 255 characters. It is not the recommended use to put more than one data point in each field, but it is possible to put multiple values in. You will need to parse the values when you retrieve the data.
You can also cut your data up into multiple segments and write it across the 8 fields every 15 seconds.

July 26, 2019
12:43 pm

cmti

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How can we write multiple values in one filed ?

July 28, 2019
8:42 pm

cstapels

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ThingSpeak will treat your entry as a string so you can use any delimiter you like to add multiple values. If they are fixed width, you wont need any delimiter at all. When you update the field, simply append all the values to the end of the GET. For example:
https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxxxxx&field1=0123456abcdefg_or_1,2,3,4,5,a,b,c,d
This command will write
"0123456abcdefg_or_1,2,3,4,5,a,b,c,d"
to field1.
Then you can parse it to separate the values.
If you add &field2= you can addinformation to field 2 in the same write.
https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxxxxx&field1=0123456abcdefg_or_1,2,3,4,5,a,b,c,d&field2=4.345

December 10, 2020
1:32 am

Momo

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I know this post is old, Idk if you will see this but I was wondering how to do the same thing but in matlab using thingspeakwrite function to upload an array of number to one field. Like [4,25,78,97] to filed 2.

December 15, 2020
7:16 am

cstapels

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FYI, MATLAB answers is the preferred location for ThingSpeak Community support.

My advice: make your array into a string before writing to the field.

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