ENVIROMENTAL.cpp

00001 #include "ENVIROMENTAL.h"
00002 
00003 
00004 //#define Ro 28 //Change this value with the value from Calibrate and uncomment
00005 
00006 
00007 ENVIROMENTAL::ENVIROMENTAL (PinName envi_SDA, PinName envi_SCL,PinName mq_analog,I2C &i2c):climate(envi_SDA,envi_SCL),bmp(envi_SDA,envi_SCL),uv(i2c),lux(envi_SDA,envi_SCL)
00008 {
00009     
00010     _mq_pin = mq_analog;
00011     uv.begin(VEML6070_1_T);
00012 }
00013 ENVIROMENTAL::~ENVIROMENTAL(){}
00014 
00015 
00016 void ENVIROMENTAL::calibrate_mq()
00017 {
00018 
00019     AnalogIn analog_value(_mq_pin);
00020     float MQ7_read;
00021     float VRL;
00022     float Rs;
00023     float Ro;
00024     float RL;
00025       for(int test_cycle = 1 ; test_cycle <= 500 ; test_cycle++) //Read the analog output of the sensor for 200 times
00026               {
00027                 MQ7_read = MQ7_read + analog_value.read(); //add the values for 500
00028               }
00029       MQ7_read = MQ7_read/500.0f; //Take average
00030     VRL = MQ7_read*(5.0f); //Convert analog value to voltage
00031     Rs = ((5.0f/VRL)-1) * RL; //is the formula obtained from datasheet
00032     Ro = Rs/1.7f;  //RS/RO is 1.7 as we obtained from graph of datasheet
00033     printf("Ro at fresh air = %f\n\r",Ro);
00034 }
00035 
00036 
00037 
00038 float ENVIROMENTAL::get_CO()
00039 {
00040     AnalogIn analog_value(_mq_pin);
00041     float MQ7_read;
00042     float VRL;
00043     float Rs;
00044     float ratio;
00045     float Ro=28;
00046     float ppm;
00047     float RL=10;
00048     float m =-0.661;
00049     float b =1.332;
00050     for(int test_cycle = 1 ; test_cycle <= 500 ; test_cycle++) //Read the analog output of the sensor for 200 times
00051                 {
00052                   MQ7_read = MQ7_read + analog_value.read(); //add the values for 500
00053                 }
00054       MQ7_read = MQ7_read/500.0f; //Take average
00055 
00056     VRL = MQ7_read*(5.0f); //Convert analog value to voltage
00057     Rs = ((5.0f/VRL)-1.0f) * RL; //is the formula obtained from datasheet
00058     ratio = Rs/Ro;
00059     ppm = pow(10, ((log10(ratio)-b)/m)); //use formula to calculate ppm
00060     return ppm;
00061 }
00062 
00063 
00064 float ENVIROMENTAL::get_temp()
00065 {
00066   float temp=0;
00067   for(int i=0;i<20;i++)
00068     {
00069       _tmp = climate.get_temperature();
00070       temp=temp + _tmp;
00071   }
00072 
00073         return temp/20;
00074 
00075 }
00076 
00077 
00078 uint32_t ENVIROMENTAL::get_humidity(){
00079     _tmp=0;
00080     uint32_t hum=0;
00081     for(int i=0;i<20;i++)
00082       {
00083         _tmp=climate.get_humidity();
00084         hum = hum + _tmp;
00085     }
00086 
00087           return hum/20;
00088 
00089 }
00090 
00091 int32_t ENVIROMENTAL::get_pressure(){
00092     _tmp=0;
00093     int32_t pres=0;
00094     for(int i=0;i<20;i++)
00095       {
00096         _tmp=bmp.getPressure();
00097         pres = pres + _tmp;
00098     }
00099 
00100           return pres/20;
00101 
00102 }
00103 
00104 int ENVIROMENTAL::get_uv(){
00105     int uvi=0;
00106     _tmp=0;
00107     for(int i=0;i<20;i++)
00108       {
00109         _tmp = uv.readUV();
00110         uvi = uvi +_tmp;
00111     }
00112 
00113           return uvi/20;
00114     
00115     
00116     
00117 }
00118 
00119 
00120 int ENVIROMENTAL::get_lumen(){
00121   int lumen=0;
00122   _tmp=0;
00123     for(int i=0;i<20;i++)
00124       {
00125         _tmp = lux.getLuminosity(2);
00126         lumen = lumen + _tmp;
00127     }
00128 
00129           return lumen/20;
00130 }
00131   
00132  int ENVIROMENTAL::get_infrared(){
00133   int lumen=0;
00134   _tmp=0;
00135     for(int i=0;i<20;i++)
00136       {
00137         _tmp = lux.getLuminosity(1);
00138         lumen = lumen + _tmp;
00139     }
00140 
00141           return lumen/20;
00142 }