Diff: Sensors.h

Revision:

0:da2b8c7a1ec1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Sensors.h	Mon May 11 15:25:52 2015 +0000
@@ -0,0 +1,80 @@
+/**
+@file sensors.h
+@brief this file contians functions that allow the user to access the sensors used in for the project\n
+@brief the sensors are barameter, thermometer and a simple voltage divider that measures voltage\n
+@author Augustine K Kizito
+@date April 2015
+*/
+#ifndef SENSORS_H
+#define SENSORS_H
+
+#include "BMP180.h"
+
+BMP180 bmp180(p28,p27);   // SDA, SCL
+AnalogIn ain(p20); // connected to PP3 battery, used to measure voltage
+
+/**
+Reads the current temperature from the BMP180 sensor and returns the value
+
+@returns float temperature in degrees celsius
+
+*/
+float getTemperature();
+/**
+Reads the current pressure from the BMP180 sensor and returns the value
+
+@returns float pressure in mbars
+
+*/
+float getPressure();
+/**
+Reads the voltage reading across the potential divider connecte to the PP3 Battery
+
+@returns float battery voltage in Volts 
+*/
+float getVoltage();
+
+
+
+
+float getTemperature()
+{
+    float temperature; // stores temperature in deg Cel
+
+    if (bmp180.ReadData(&temperature,NULL)) {
+        // tempeature value is returned successfully
+
+    } else {
+        // sensor failed
+        temperature = -100;
+    }
+
+    return temperature;
+}
+
+float getPressure()
+{
+    float pressure; // stores pressure in hPa
+
+    if (bmp180.ReadData(NULL, &pressure)) {
+        // pressure value is returned successfully
+
+    } else {
+        // sensor failed
+        pressure = -10;
+    }
+
+    return pressure;
+
+}
+
+float getVoltage()
+{
+    // calculate voltage
+    float voltage = ain*9.9+1.8;
+    
+    return voltage;
+
+}
+
+#endif
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