comparison of multiple thing speak fields with mat lab

Question

Dayne Gilleland 2020-1-27

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回答： avram alter 2020-2-3

采纳的回答： avram alter

Is it possible to set up Matlab to compare thing speak field values.

Field 4 = 1 and Field 5 = 1 and Field 1 > 4 then

delay 30 secounds

Alert message " xxxxxxxxx"

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Dayne Gilleland 2020-2-3

Thanks

I am now having trouble using Thingspeak Alert API consistantly to generate email message when conditions are correct with the MATLAB code. The code does not fault but I get the error message, " Failed to send alert: The server returned the status 429 with message "Too Many Requests" in response to the request to URL https://api.thingspeak.com/alerts/send. sometimes, not everytime.

avram alter 2020-2-3

According to the thingSpeak alert documentation in MATLAB, Under limitations:

"Users are limited to 2 alerts every 30 minutes. The rate limit is applied when the request is made, not when the email is sent. If you exceed the request limit, the API returns the response code 429."

you can read more about that here:

https://www.mathworks.com/help/thingspeak/sendalert.html

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Answer 1

avram alter 2020-2-3

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/502231-comparison-of-multiple-thing-speak-fields-with-mat-lab#answer_413598

在 MATLAB Online 中打开

you can set your fields to variables, and use logical evaluators under your personal parameters:

field1 = %set this to equal the appropriate channel/value/etc
field2 =
field3 =
field4 =
field5 =
if field4 == 1 && field5 == 1 && field1 > field4
    disp('XXXXXXXXX')
end