Diff: omegaPX209/omegaPX209.cpp

Revision:

54:d4990fb68404

Parent:

17:7c16b5671d0e

Child:

55:f4ec445c42fe

--- a/omegaPX209/omegaPX209.cpp	Thu Jun 07 13:02:08 2018 +0000
+++ b/omegaPX209/omegaPX209.cpp	Fri Jun 08 13:56:30 2018 +0000
@@ -2,19 +2,25 @@
 This class wraps an Omega pressure transducer.
 Author: Matthew, October 24th, 2013
 Modified: Dan, 2017-10-30
+
+WIP: Troy
+- added the ability to read the counts from this class directly
+- had to fix the class to have the header guard in the header file (#ifndef, #define, #endif)
 */
 
 #include "mbed.h"
 #include "omegaPX209.hpp"
+#include "StaticDefs.hpp"       //pins and other hardware (new)
 
 omegaPX209::omegaPX209(PinName pin): 
-    _adc(pin)
+    _adc(pin)   //leaving function as is for now
 {
     _psi = 14.7;                    // pressure [psi]
     _zeroPsi = 14.7;                // atmospheric pressure at sea level [psi]
-    _adcVoltage = 3.3;              // mbed ADC system voltage [V]
+    _adcVoltage = 5.6;              // Troy: I'm not sure this is the right name for this multiplier... [V] (was 3.3 before)
     _fullscale = 50;                // value of sensor at full scale (*confirm with Stearns*) [psi]
-    _cal = _fullscale/5.0;          // psi per volt calibration [psi/V]
+    _psi_per_volt_cal = _fullscale/5.0;          // psi per volt calibration [psi/V]
+    _PSI_reading = 0;
 }
 
 // nothing to initialize, but you can call this function if it makes you feel better.
@@ -35,11 +41,18 @@
 float omegaPX209::getPsi() {
     // filter by over-sampling
     float add = 0;
+    float adc_reading = 0;
+    float PSI_reading = 0;
+    
     for (int i = 0; i < OVERSAMPLE; i++) {
         // analog input _adc is float 0.0 to 1.0
         // multiplying by _adcVoltage converts percentage to a voltage
         // multiplying by _cal converts voltage to a pressure
-        add += _adc.read() * _adcVoltage * _cal;
+        adc_reading = adc().readCh4()/4095.0;
+        
+        _PSI_reading = adc_reading * _adcVoltage * _psi_per_volt_cal;    //Note: real_voltage_reading = adc_reading * _adcVoltage
+        
+        add += PSI_reading;    //replaced _adc.read()
     }
     
     // use over-sampled
@@ -61,4 +74,21 @@
 // call this if you want to tare to zero
 void omegaPX209::tare() {
     setZero(getPsi());
+}
+
+// 06/06/2018
+
+int omegaPX209::readADCCounts() {
+    //return _adc.read();
+    return adc().readCh4();
+}
+
+float omegaPX209::readVoltage() {
+    float pressure_voltage = adc().readCh4()/4095.0 * 5.6;
+    return pressure_voltage;
+}
+
+float omegaPX209::getRawPSI() {
+    float pressure_raw = adc().readCh4()/4095.0 * 56;
+    return pressure_raw;
 }
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