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pls help me to build water level meter.the one i made uses 5 probes for empty,quarter,half and full.Now a want a better design.can i use uvison and simulate something. what
I guess you did not read this thread.
There are a number of suggested designs in this thread for measuring the water level with a single sensor.
www.arrowne.com/.../f_1550.shtml
"The devices rely for their operation on the sensitivity of the PTC element's tip to variations in ambient thermal conditions. The transition from liquid to air and vice versa causes the rate of thermal loss to change very quickly as does the resistance of the PTC element. This allows the device to record very simply and exactly whenever a liquid goes above or below a certain level."