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How to simultaneously publish the data to multi fields of thingspeak channel from a raspberry pi via code generation deployment using MATLAB code(not via Simulink) .

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prechanon kumkratug
回答： Christopher Stapels 2020-1-22
The method to publish one field(field1) to think speak is given by the John Anderson
% raspberry pi object
r = raspi();
% log file
fid = fopen( 'logFile.log', 'w' );
% write random number to thingSpeak channel
v = rand;
commandStr = [ 'sudo curl -s "https://api.thingspeak.com/update.json?api_key=<your api key here>&field1=' sprintf( '%f', v ) '"' ];
result = system( r, commandStr );
% log command
fprintf( fid, '%s \n', commandStr );
% log result
fprintf( fid, '%s \n', result );
% close log
fclose( fid );
https://www.mathworks.com/matlabcentral/answers/467879-how-do-i-write-to-a-thingspeak-channel-from-a-raspberry-pi-via-code-deployed-using-the-matlab-coder
How to modify it to simultaneously publish the 2 data to 2 fields (field1 and field2) of thingspeak channel .

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回答（1 个）

Christopher Stapels
Have a look at the Write Data page. You can append &fieldX=value to add additional fields to an update.

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