Depth Sensing There is a linear relationship between pressure and depth. The following is the mathematical representation of the relationship: ΔP = γh –ΔP Pressure Difference –γ Specific Weight of Liquid –h Change In Elevation
Freescale MPX4250AP Ported Pressure Sensor
Pressure Sensor Tests The data collected from the pool test shows that the sensor has a linear output of about 62mV per foot. This gives us a full scale voltage of about 4.25 V which provides an excellent resolution to feed into the A2D converter on the HC08.