PID in ThingSpeak code
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I tried to write pid code in thingspeak app matlab analysis, but I faced some problem. Can anyone help?
sensed_output = thingSpeakRead(readChannelID), control_signal;
setpoint=23;
Kp = 1;
Ki = 1;
Kd = 1;
T= 5000;
double total_error, last_error;
int max_control=100;
int min_control=0
double error = setpoint - sensed_output;
total_error += error;
if total_error >= max_control
total_error = max_control;
elseif total_error <= min_control
total_error = min_control;
else
total_error = total_error;
end
double delta_error = error - last _error;
control_signal = Kp*error + (Ki*T)*total_error + (Kd/T)*delta_error;
if control_signal >= max_control
control_signal = max_control;
elseif control_signal <= min_control
control_signal = min_control;
else
control_signal = control_signal;
end
last_error = error;
analyzedData = control_signal;00
%% Write Data %%
thingSpeakWrite(writeChannelID, analyzedData, 'WriteKey', writeAPIKey);
1 comentario
Image Analyst
el 23 de En. de 2021
Do not use double or int before the lines where you assign values.
Respuestas (1)
Christopher Stapels
el 25 de En. de 2021
I'd suggest you have a look at the MATLAB onramp. Its a two hour introduction to MATLAB fundamentals, I think you would find it really helpful. Once you have that down, I think writing the PID code will be much easier.
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