Unable to write data to ThingSpeak , HTTP error 400

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Otto Meier
Otto Meier 2020-1-6
编辑： Christopher Stapels 2021-8-17
Hello,
I am trying to transfer data by using program "Typical Write Example" running on ESP8266 NodeMCU. I didn't change he program , only added my Network name, network password, channel number and APIWriteKey. The Program is running on ESP8266 or ESP32. In both cases the response is always "400".
Don't have more detailed information.
Any idea on the cause ? Router problem , Arduino IDE 1.8.10 or ?
Any comment is appreciated.
Kind regards

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回答（3 个）

Vinod
Vinod 2020-1-6
Hello Otto,
Can you start from one of the examples in the library here: https://github.com/mathworks/thingspeak-arduino
Are you getting 400 status codes for those examples?
-Vinod
  1 个评论
Otto Meier
Otto Meier 2020-1-6
Hello Vinod,
many thanks for your fast response.
I tried just the example "Typical Write Example" and it responses only 400 status code.
Otto

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Christopher Stapels
Can you try to update your channel from a web browser? Use the format
https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxxxxx&field1=1230 but change the api key to match.
Does that work?
  9 个评论
显示 7更早的评论
Otto Meier
Otto Meier 2020-1-6
I guess I could solve the problem:
Write API Key contains a "O" and I typed a "0" (Zero). Sorry , I did not recognize !!!
That was the difference why the copied command from the API request which worked.
Many thanks for your patience and best regards from Germany

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Nazmi Rosly
Nazmi Rosly 2021-8-16
编辑：Christopher Stapels 2021-8-17
Hi. Im trying to send data from matlab which is the data from serial monitor from arduino. It is fine until 9th of data and then it stopped and says :
Error using Untitled (line 27)
'Values' must have a maximum of 9 elements, including the timestamp.
My coding is:
clear all
s = serial('com4');
fopen(s);
i = 1;
while(1)
data(i)= str2double(fscanf(s));
plot(data);
title('Temperature Monitoring')
xlabel('Time')
ylabel('Temperature')
pause(30);
i=i+1;
%thingSpeakWrite(1463959,data,'WriteKey','xxxxxxxxxxxxxxxx')
% Generate timestamps for the data
%tStamps = datetime('now')-minutes(9):minutes(1):datetime('now');
channelID = 1463959; % Change to your Channel ID
writeKey = 'xxxxxxxxxxxxxxxx'; % Change to your Write API Key
% Write 10 values to each field of your channel along with timestamps
tStamp = datetime('now')
thingSpeakWrite(1463959,data,'WriteKey','xxxxxxxxxxxxxxxx','TimeStamp',tStamp)
end

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