subplot(411), plot(time, level), grid on, xlabel('time [sec]'), ylabel('level [m]')
subplot(412), plot(time, pelampung), grid on, xlabel('time [sec]'), ylabel('pelampung')
subplot(413), plot(time, pompa), grid on, xlabel('time [sec]'), ylabel('pompa')
subplot(414), plot(time, keran), grid on, xlabel('time [sec]'), ylabel('keran [liter/detik]')