subplot(411), plot(time, pelampung), grid on, ylabel('Status Pelampung')
subplot(412), plot(time, debit_in), grid on, ylabel('Debit In [liter/sec]')
subplot(413), plot(time, debit_out), grid on, ylabel('Debit Out [liter/sec]')
subplot(414), plot(time, level), grid on, ylabel('level [cm]'), xlabel('time [sec]')