Diff: main.cpp

Revision:

2:322470aeeae9

Parent:

1:00fe5bf692b4

diff -r 00fe5bf692b4 -r 322470aeeae9 main.cpp
--- a/main.cpp	Sat Jun 06 17:00:06 2020 +0000
+++ b/main.cpp	Wed Jun 24 11:39:43 2020 +0000
@@ -1,39 +1,104 @@
 #include "mbed.h"
 
-Serial ttl(PC_12,PD_2);
-AnalogIn flowIn(PA_1);
+Serial ble(PC_12,PD_2);  //BLE
+Serial co2(PC_10,PC_11);  //CO2 sensor
+AnalogIn flowIn(PA_1);  //Flow sensor
+I2C si7051(PB_9, PB_8); //Si7051 temperature sensor
 
 float flowVal1;
 float flowVal2;
 float Pressure;
+float finalflow;
 
-float finalflow;
-float flow(){
-   flowVal1=3.3*flowIn; //Logic level 3.3
-          flowVal2 = 1.5*flowVal1; //5v
-          Pressure =(125*flowVal2)-62.5;
-          //finalflow=(0.3425*sqrt(Pressure))-0.198; //flow in litter per min
-          //finalflow= (-6.12e-5)*(Pressure)*(Pressure) + (2.98e-2)*Pressure - 8.83e-2;
-          return Pressure;
+///Flow function///
+float flow()
+{
+    flowVal1=3.3*flowIn; //Logic level 3.3
+    flowVal2 = 1.5*flowVal1; //5v
+    Pressure =(125*flowVal2)-62.5; //Used for calibration
+    finalflow=(0.3425*sqrt(Pressure))-0.198; //Used for program, flow in litter per min
+    return finalflow;
 }
 
-int main(){       
-ttl.baud(115200);
+///CO2 setup///
+int value;
+float carbon()
+{
+    bool allow = false;
+    char c;
+    char co2_measure[5];
+    int count=0;
+
+    while(1) 
+    {
+        c = co2.getc();
+        //based on the user manual PDF for the CO2 sensor, the value starts with "Z"
+        //and we need to extract the right number of CO2 value
+        if(c=='Z') {
+            allow = true;
+        }
 
-    ttl.printf("$");//enter command mode only for rn
+        if(allow) {
+            if(c>=48 && c<=57) {
+                co2_measure[count]=c;
+                count++;
+            }
+        
+            if(count>=6) { 
+                value = ((co2_measure[0]-'0')*100000+co2_measure[1]-'0')*10000+(co2_measure[2]-'0')*1000+(co2_measure[3]-'0')*100; 
+                float CAR;
+                CAR=(float)value/10000;
+                count=0;
+                allow=false;
+                return CAR;
+            }
+        }
+    }
+}
+
+
+int main()
+{
+    ble.baud(115200);
+
+    ble.printf("$");//enter command mode only for rn
     wait(0.1);
-    ttl.printf("$$");//enter command mode
+    ble.printf("$$");//enter command mode
     wait(0.5);
-    ttl.printf("SN,Flow Calibration\r");//set new name
+    ble.printf("SN,Flow Calibration\r");//set new name
     wait(0.5);
-    ttl.printf("SS,C0\r");//set transparent uart
+    ble.printf("SS,C0\r");//set transparent uart
     wait(0.5);
-    ttl.printf("---\r");//enter data mode
+    ble.printf("---\r");//enter data mode
     wait(0.5);
     
-    while(1){
-        ttl.printf("%f\n", flow());    
-        wait(0.1); 
-        } 
+    ///TEMP SETUP///
+    int tempAddr=0x80; //si7050 8bit address
+
+    char wTemp[1];
+    wTemp[0]=0xE3; //Hold master mode
+    char rTemp[2]; //Temperature returns MSB and LSB
+    //assume MBS in rTemp[0] and LSB in rTemp[1]
+
+    char wInit[2];
+    wInit[0]=0xE6; //User register 1
+    wInit[1]=0x00; //Set 14 bit resolution, other read-ony registers shouldn't be affected
+
+    si7051.write(tempAddr,wInit,2);
+    ///END TEMP///
+    
+    float temp_code;
+    float SiTemp;
+    
+    while(1) {
+        si7051.write(tempAddr,wInit,2);
+        si7051.write(tempAddr,wTemp,1);
+        si7051.read(tempAddr,rTemp,2); //Returns 2 bytes
+        temp_code=(rTemp[0]<<8)+rTemp[1];
+        SiTemp=((175.72*temp_code)/65536)-46.85;
+        
+        ble.printf("Flow:%.2fl/s,CO2:%.2f%,Temperature:%.2fC\n", flow(),carbon(),SiTemp);
+        wait(0.1);
+    }
 
 }