Diff: main.cpp

Revision:

0:085d20f0ca45

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Feb 07 20:16:43 2017 +0000
@@ -0,0 +1,157 @@
+#include "mbed.h"
+#include "BMP280.h"
+#include "DHT.h"
+#include "stdio.h"
+
+Timer txTimer, mqTimer;
+Serial device(p9, p10);
+BMP280 bmpObj(p28, p27);
+DHT dhtObj(p21,DHT11);
+AnalogIn mqObj(p20);
+
+char sensorConf[4];
+char msg[60];
+
+bool tmpFlag = true;    //temperature sensor flag
+bool presFlag = true;   //pressure sensor flag
+bool co2Flag = true;    //co2 sensor flag
+bool humFlag = true;    //humidity sensor flag
+
+bool rxFlag = false;    //recieve packet flag
+
+int bmpTmp,bmpPres,dhtHum,dhtTmp;     //stores bmp280 temperature and sensor value
+int avgTmp;                                 //average of bmpTmp and dhtTmp
+uint16_t mqCo2;
+
+//enable or desable sensors
+void setSensors(void);
+
+//get temperature and pressure values from bmp280
+void bmpGetValue(void);
+
+//get temperature and humidity value from dht11
+void dhtGetValue(void);
+
+//get airquality value from mq135
+void mqGetValue(void);
+
+
+void rx_interrupt()
+{
+    int i = 0;
+
+    while(device.readable()){
+        sensorConf[i++]= device.getc();
+        i++;
+        }
+
+    sensorConf[i] = '\0';
+    rxFlag = true;
+
+    return;
+}
+
+int main()
+{
+    //device.attach(&rx_interrupt,device.RxIrq);
+
+    bmpObj.initialize();        //initialize bmp280 sensor
+
+    txTimer.start();                //start transmit timer
+    mqTimer.start();                //start airquality timer
+
+    while (true) {
+        bmpGetValue();              //get value from bmp280 sensor
+        dhtGetValue();              //get value from dht11 sensor     
+
+        if (mqTimer.read_ms()>2000) {
+            mqGetValue();
+            mqTimer.reset();
+        }
+
+        if(rxFlag) {
+            setSensors();
+            rxFlag = false;
+        }
+        
+        if(bmpTmp!=0 && dhtTmp!=0) {
+
+            avgTmp = (bmpTmp + dhtTmp)/2;
+        }
+        
+        if(txTimer.read_ms()>8000) {
+            if(device.writeable()) {
+                sprintf(msg,"TMP %d PRS d% CO2 d% HUM %d ",avgTmp,bmpPres,mqCo2,dhtHum);
+                device.puts(msg);
+            }
+            txTimer.reset();
+        }
+
+        wait(0.5);
+    }
+}
+
+void bmpGetValue(void)
+{
+    if(tmpFlag) {
+        bmpTmp = bmpObj.getTemperature();
+    }
+    if(presFlag) {
+        bmpPres = bmpObj.getPressure();
+    }
+}
+
+void dhtGetValue(void)
+{
+    int s = dhtObj.readData();
+    wait(0.5);
+    if (s == ERROR_NONE) {
+        if(humFlag) {
+            dhtHum  = dhtObj.ReadHumidity();
+        }
+        if(tmpFlag) {
+            dhtTmp  = dhtObj.ReadTemperature(CELCIUS);
+        }
+    }
+}
+
+void mqGetValue()
+{
+    if(co2Flag) {
+        mqCo2 = mqObj.read_u16();
+    }
+}
+
+void setSensors(void)
+{
+    if(sensorConf[0]=='T') {
+        if(sensorConf[1]=='0') {
+            tmpFlag = false;
+            avgTmp = 0;
+        } else {
+            tmpFlag = true;
+        }
+    } else if(sensorConf[0]=='P') {
+        if(sensorConf[1]=='0') {
+            presFlag = false;
+            bmpPres = 0;
+        } else {
+            presFlag = true;
+        }
+    } else if(sensorConf[0]=='C') {
+        if(sensorConf[1]=='0') {
+            co2Flag = false;
+            mqCo2 = 0;
+        } else {
+            co2Flag = true;
+        }
+    } else if(sensorConf[0]=='H') {
+        if(sensorConf[1]=='0') {
+            humFlag = false;
+            dhtHum = 0;
+        } else {
+            humFlag = true;
+        }
+    }
+}
+