subplot(411), plot(time,level), grid on, xlabel('waktu [sec]'), ylabel('level [m]')
subplot(412), plot(time,sensor_level), grid on, xlabel('waktu [sec]'), ylabel('V_level [V]')
subplot(413), plot(time,suhu), grid on, xlabel('waktu [sec]'), ylabel('suhu [C]')
subplot(414), plot(time,sensor_suhu), grid on, xlabel('waktu [sec]'), ylabel('V_suhu [V]')