Diff: sensors.cpp

Revision:

3:31aec950f7dc

Parent:

2:cd0ea77c7d66

--- a/sensors.cpp	Thu Sep 13 05:52:55 2018 +0000
+++ b/sensors.cpp	Fri Sep 14 10:52:15 2018 +0000
@@ -115,7 +115,7 @@
 //--------
 float mq::getairdata()
 {
-    
+    return signallevel.read();
 }  
 //-----------
 void mq::reset()
@@ -125,4 +125,95 @@
 int mq::read()
 {
     return signal.read();
+}
+//===========================================
+dht11::dht11(PinName pin)
+    :datapin(pin)
+{
+    starttime.start();
+    usb2pc.printf("dht11 start!\r\n");
+}
+//----------
+int dht11::getdata()
+{
+    int timeout=10000;
+    uint8_t data[5];
+    uint8_t bit=7;
+    uint8_t count=0;
+        
+    for(int i=0;i<5;i++)
+    {
+        data[i]=0;
+    }
+    if(starttime.read_ms()<1500){while(starttime.read_ms()<1500){}starttime.stop();}
+        
+    datapin.output();
+    datapin=0;
+    wait_ms(19);
+    datapin=1;
+    wait_us(30);
+    datapin.input();
+        
+    while(!datapin)
+    {
+        if(timeout--==0){usb2pc.printf("timeout!no reset\r\n");return 0;}
+    }
+    timeout=10000;
+    while(datapin)
+    {
+        if(timeout--==0){usb2pc.printf("timeout!no respanse\r\n");return 0;}
+    }
+    timeout=10000;
+    for(int i=0;i<40;i++)
+    {
+        while(!datapin)
+        {
+            if(timeout--==0){usb2pc.printf("timeout!\r\n");return 0;}
+        }
+        timer.start();
+        timeout=10000;
+        while(datapin)
+        {
+            if(timeout--==0){usb2pc.printf("timeout!n\r\n");return 0;}
+        }
+        timeout=10000;
+        long t=timer.read_us();
+        timer.stop();
+        timer.reset();
+            
+        if(bit==0)
+        {
+            if(t>40){data[count]|=(1<<bit);}
+            bit=7;
+            count++;
+        }
+        else
+        {
+            if(t>40)
+            {
+                data[count]|=(1<<bit);
+            }
+            bit--;
+        }
+    }
+    datapin=1;
+    if(data[4]==data[0]+data[1]+data[2]+data[3])
+    {
+        //usb2pc.printf("Humidity (%):%f\r\n",(float)data[0]);
+        //usb2pc.printf("Temperature (oC): %f\r\n",(float)data[2]);
+        H=data[0]+data[1]/10.0;
+        T=data[2]+data[3]/10.0;
+        return 1;
+    }
+    else{usb2pc.printf("error!\r\ndata0:%d\tdata1:%d\r\ndata2:%d\tdata3:%d\r\ndata4:%d\r\n",(int)data[0],(int)data[1],(int)data[2],(int)data[3],(int)data[4]);return 0;}
+}  
+//-------
+float dht11::gethumidity()
+{
+    return H;
+}
+//-------
+float dht11::gettemperature()
+{
+    return T;
 }
\ No newline at end of file