function y = pelampung(x)
Volume_max = 1100; % Volume maksimum tangki [liter]
diameter = 0.8; % Diameter tangki = 0.8 meter
r = 0.5*diameter; % Jari-jari tangki = 0.5 * diameter
A = pi*(r^2); % A = luas penampang tangki
Level_max = Volume_max/A; % Level Maksimum = Vmax/A
if