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Dependencies:   mbed MODSERIAL FATFileSystem

omegaPX209/omegaPX209.cpp@10:085ab7328054, 2017-10-23 (annotated)

Committer:
danstrider
Date:
Mon Oct 23 12:50:53 2017 +0000
Revision:
10:085ab7328054
Parent:
9:d5fcdcb3c89d
Child:
14:85b64a4d08e8
checked out on the hardware

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mkelly10 9:d5fcdcb3c89d 1 /*
mkelly10 9:d5fcdcb3c89d 2 Matthew Kelly
mkelly10 9:d5fcdcb3c89d 3 October 24th, 2013
mkelly10 9:d5fcdcb3c89d 4 The purpose of this class is to define a a data structure with all of the necessary information and member functions...
mkelly10 9:d5fcdcb3c89d 5 to fully describe a single ultrasonic transducer for use in a relative positioning system.
mkelly10 9:d5fcdcb3c89d 6 */
mkelly10 9:d5fcdcb3c89d 7
mkelly10 9:d5fcdcb3c89d 8 #include "mbed.h"
mkelly10 9:d5fcdcb3c89d 9 #include "omegaPX209.hpp"
mkelly10 9:d5fcdcb3c89d 10
danstrider 10:085ab7328054 11 omegaPX209::omegaPX209(PinName pin):
danstrider 10:085ab7328054 12 depthP(pin)
mkelly10 9:d5fcdcb3c89d 13 {
mkelly10 9:d5fcdcb3c89d 14 }
mkelly10 9:d5fcdcb3c89d 15
danstrider 10:085ab7328054 16 void omegaPX209::initialize() {
mkelly10 9:d5fcdcb3c89d 17 P = 0; // Pressure [psi]
mkelly10 9:d5fcdcb3c89d 18 cal = 12; // Volts per psi
mkelly10 9:d5fcdcb3c89d 19 multiplier = 3.3; // Maximum voltage in
mkelly10 9:d5fcdcb3c89d 20 }
mkelly10 9:d5fcdcb3c89d 21
danstrider 10:085ab7328054 22 float omegaPX209::getPsi() {
mkelly10 9:d5fcdcb3c89d 23 P = depthP*multiplier*cal;
mkelly10 9:d5fcdcb3c89d 24 return P;
mkelly10 9:d5fcdcb3c89d 25 }
danstrider 10:085ab7328054 26
danstrider 10:085ab7328054 27 // math sourced from http://www.kylesconverter.com/pressure/feet-of-water-to-pounds-per-square-inch
danstrider 10:085ab7328054 28 float omegaPX209::getDepth() {
danstrider 10:085ab7328054 29 P = getPsi(); // read the sensor
danstrider 10:085ab7328054 30 float pascals = (P * 6894.76) - (14.7 * 6894.76); // convert psi to Pascals
danstrider 10:085ab7328054 31 float depth_m = pascals / (density_of_water_g_cc * 1000 * 9.80665); // convert Pa to fluid depth in meters
danstrider 10:085ab7328054 32 float depth_ft = 3.28084 * depth_m; // convert meters to feet
danstrider 10:085ab7328054 33
danstrider 10:085ab7328054 34 return depth_ft;
danstrider 10:085ab7328054 35 }