how to make a thermostat in matlab

Here's a simple way to simulate a thermostat in Matlab using a basic control algorithm called On-Off control. On-Off control turns the heater on when the temperature is below a set point (SP), and turns it off when the temperature is above the set point.

  1. Define the Constants:
main.m
SP = 25;     % Set point temperature (degrees Celsius)
tol = 0.2;    % Tolerance (+/-) around the set point
deltaT = 0.1; % Time step for simulation (seconds)

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  1. Initialize the Variables:
main.m
t = [0:deltaT:3600]; % Time for simulation (1 hour)
T(1) = 23;      % Initial temperature (degrees Celsius)

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  1. Create the On-Off Controller:
main.m
for i = 2:length(t)
   if T(i-1) < SP-tol % Heater is off
       Q(i-1) = 0;
   elseif T(i-1) > SP+tol % Heater is on
       Q(i-1) = 1;
   else % Temperature is within tolerance
       Q(i-1) = Q(i-2); % Keep the previous state
   end
   T(i) = T(i-1) + deltaT*(10*Q(i-1) - 0.1*(T(i-1)-23)); % Temperature model
end

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  1. Plot the Results:
main.m
plot(t/60,T,'LineWidth',2)
hold on
plot([0; t(end)]/60,[SP; SP],'--','Color','r','LineWidth',2)
xlabel('Time (min)')
ylabel('Temperature (C)')
legend('Temperature','Set Point')

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Note: This is a very basic and idealized model of a thermostat. A practical thermostat would have additional features such as hysteresis, proportional-integral-derivative (PID) control, and non-linear heating characteristics.

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