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pid controller with daq

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mado
mado on 26 Mar 2014
Commented: mado on 27 Mar 2014
i want to use PID to make control on buck converter , output the control signal using daq card usb6008 .
any suggestion on building the controller in real time. or how to do this equation
vn= vn-1+ kp(en - en-1) + ki((en + en-1)/2)t + kd/t(en - (2en-1) + en-2),
  1 Comment
mado
mado on 27 Mar 2014
i tried this equation but it isn't working
for i=1:3
read=getsaample(ai)
Vmeasured=read(:,1)
e(i+1)= Vmeasured*2-Vref
IE=sum(e); %Integral of Error
%e= 18 - Vref
dt=.01
KP=2;
KI =1;
Int(i+1) = (e(i+1) + e(i))*dt/2; % integration of the error
I(i+1) = sum(Int); % the sum of the integration of the error
u=(KP*(e(i+1))+KI*I(i+1)) % control signal
end

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