Unable to write data to ThingSpeak , HTTP error 400
31 views (last 30 days)
Show older comments
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
0 Comments
Answers (3)
Vinod
on 6 Jan 2020
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
Christopher Stapels
on 6 Jan 2020
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 Comments
Nazmi Rosly
on 16 Aug 2021
Edited: Christopher Stapels
on 17 Aug 2021
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
0 Comments
Communities
More Answers in the ThingSpeak Community
See Also
Categories
Find more on REST API in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!