subplot(411), plot(time,kendali), grid on, xlabel('time [sec]'), ylabel('kendali [C]')
subplot(412), plot(time,suhu), grid on, xlabel('time [sec]'), ylabel('suhu [C]')
subplot(413), plot(time,sensor), grid on, xlabel('time [sec]'), ylabel('sensor [Volt]')
subplot(414), plot(time,ref), grid on, xlabel('time [sec]'), ylabel('reference [Volt]')
