Revision 13:9a2016106dae, committed 2017-05-06

Comitter:

imi121

Date:

Sat May 06 17:39:25 2017 +0000

Parent:

12:80d8e97e81f2

Commit message:

This is a project to interface Airquality MQ135 sensor with STM Nucleo -F401RE and IDW Wireless board. The outputs is available on thingspeak as well

Changed in this revision

diff -r 80d8e97e81f2 -r 9a2016106dae DHT11.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DHT11.lib	Sat May 06 17:39:25 2017 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/s_inoue_mbed/code/DHT11/#e91c151d1798

diff -r 80d8e97e81f2 -r 9a2016106dae NetworkSocketAPI.lib
--- a/NetworkSocketAPI.lib	Mon Jan 16 13:26:50 2017 +0000
+++ b/NetworkSocketAPI.lib	Sat May 06 17:39:25 2017 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/teams/NetworkSocketAPI/code/NetworkSocketAPI/#ea3a618e0818
+https://mbed.org/teams/NetworkSocketAPI/code/NetworkSocketAPI/#ea3a618e0818

diff -r 80d8e97e81f2 -r 9a2016106dae X_NUCLEO_IDW01M1v2.lib
--- a/X_NUCLEO_IDW01M1v2.lib	Mon Jan 16 13:26:50 2017 +0000
+++ b/X_NUCLEO_IDW01M1v2.lib	Sat May 06 17:39:25 2017 +0000
@@ -1,1 +1,1 @@
-https://developer.mbed.org/teams/ST/code/X_NUCLEO_IDW01M1v2/#c8697141ce44
+http://developer.mbed.org/teams/ST/code/X_NUCLEO_IDW01M1v2/#c8697141ce44

diff -r 80d8e97e81f2 -r 9a2016106dae main.cpp
--- a/main.cpp	Mon Jan 16 13:26:50 2017 +0000
+++ b/main.cpp	Sat May 06 17:39:25 2017 +0000
@@ -16,10 +16,22 @@
 
 #include "mbed.h"
 #include "SpwfInterface.h"
+//#include "NTPClient.h"
+//#include "HTTPClient.h"
 #include "TCPSocket.h"
+#include "DHT11.h"
 
 
-
+#define PORT 1234
+#define MAX_PENDING 1
+/*Thing speak settings */
+//NTPClient ntp;
+//HTTPClient http;
+ 
+//char* ntpServerUrl = "0.ca.pool.ntp.org";
+#define IP "184.106.153.149" 
+char* thingSpeakUrl = "http://api.thingspeak.com/update";
+char* thingSpeakKey = "SBYDOEXE50MNOBSI";
 //------------------------------------
 // Hyperterminal configuration
 // 9600 bauds, 8-bit data, no parity
@@ -27,41 +39,84 @@
 
 Serial pc(USBTX, USBRX);
 DigitalOut myled(LED1);
-
-/*************************************
-//FRDM-K64: D9->UART1_TX, D7->UART1_RX
-Pin connections:
-    FRDM      IDW01M1
-   ------    ---------
-    +3v3 <--> +3v3
-    GND  <--> GND
-    D9   <--> D8
-    D7   <--> D2
-
-SpwfSAInterface spwf(D9, D7, false);
-*************************************/
-/*************************************
-//LPCXpresso11U68: D9->UART1_TX, D7->UART1_RX
-Pin connections:
-    LPC      IDW01M1
-   ------    ---------
-    +3v3 <--> +3v3
-    GND  <--> GND
-    A1   <--> D8
-    A2   <--> D2
-
-SpwfSAInterface spwf(A1, A2, false);
-*************************************/
+AnalogIn   ain(A0);
+DHT11 sensor(PA_1);
+/*************************************/
 
 //NUCLEO: D8->UART1_TX (PA_9), D2->UART1_RX (PA_10)
 SpwfSAInterface spwf(D8, D2, false);
+const double Rl      = 10000.0;               // Rl (Ohm) - Load resistance
+const double Vadc_5  = 0.0048828125;         // ADC step 5V/1024 4,88mV (10bit ADC)
 
-int main() {
+//const double Vadc_33 = 0.0032226562;         // ADC step 3,3V/1024 3,22mV (10bit ADC)
+double Vrl;                                  // Output voltage
+double Rs;                                   // Rs (Ohm) - Sensor resistance
+double ppm;                                  // ppm
+double ratio;
+int temp;
+int humid;   
+
+//Calculation of PPM
+void calculatePPM() 
+{
+  double lgPPM;
+  Vrl = (double)ain*Vadc_5;             // For 5V Vcc use Vadc_5
+  Rs = (5 - Vrl)/Vrl;                   // Calculate sensor resistance
+  ratio = Rs/Rl;                             // Calculate ratio
+  lgPPM = (log10(ratio) * -0.8)+ 0.9;        // Calculate ppm
+  ppm = pow(10,lgPPM);                       // Calculate ppm
+  pc.printf("The ppm value is %lf \n",ppm);
+  pc.printf("The raw Rs is %2.3lf\n",ratio);
+  pc.printf("The raw voltage is %2.3lf \n",Vrl);
+}
+
+int http_demo(void)
+{
+    TCPSocket socket(&spwf);
+    char buffer[256];
+    char message[40];
+    int err;
+    printf("Sending HTTP Data to thingspeak...\r\n");
+
+    // Open a socket on the network interface, and create a TCP connection to thingspeak
+    //socket.open(&spwf);
+    err=socket.connect(IP,80); // connecting to thingspeak
+    if(err!=0) 
+    {
+      pc.printf("\r\nCould not connect to Socket, err = %d!!\r\n", err); 
+      return -1;
+    } else pc.printf("\r\nconnected to host server\r\n"); 
+    // Send a simple http request
+    //buffer[0] = 0;
+    //sprintf(buffer, "GET https://api.thingspeak.com/update?api_key=SBYDOEXE50MNOBSI&field1=%f&field2=%d&field3=%d",(float)ppm,temp,humid);//thingSpeakUrl,thingSpeakKey,
+    sprintf(message,"field1=%f&field2=%d&field3=%d",ppm,temp,humid);
+    printf("Message Length=%d\r\n",(int)strlen(message));
+    sprintf(buffer,"POST /update HTTP/1.1\r\nHost: api.thingspeak.com\r\nConnection: close\r\nX-THINGSPEAKAPIKEY: %s\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: %d\r\n\r\n%s",thingSpeakKey,(int)strlen(message),message);
+    pc.printf("Request to %s\r\n", buffer);
+    //char sbuffer[] = "GET / HTTP/1.1\r\nHost: www.arm.com\r\n\r\n";
+    int scount = socket.send(buffer, (int)strlen(buffer));
+    printf("sent %d [%.*s]\r\n", scount, strstr(buffer, "\r\n")-buffer, buffer);
+
+    // Recieve a simple http response and print out the response line
+    char rbuffer[64];
+    int rcount = socket.recv(rbuffer, sizeof rbuffer);
+    printf("recv %d [%.*s]\r\n", rcount, strstr(rbuffer, "\r\n")-rbuffer, rbuffer);
+
+    // Close the socket to return its memory and bring down the network interface
+    socket.close();
+    return 0;
+}
+
+int main() 
+{
     int err;    
-    char * ssid = "STM";
-    char * seckey = "STMDemo";  
-    
-    pc.printf("\r\nX-NUCLEO-IDW01M1 mbed Application\r\n");     
+    char * ssid = "VM957191-2G";
+    char * seckey = "krzvzkcw";  
+    //char buffer[255];
+    //time_t ctTime;
+    //Host server(IpAddr(), 123, ntpServerUrl);
+    //ntp.setTime(server);
+    pc.printf("\r\nAir Quality and Environment monitoring Application\r\n");     
     pc.printf("\r\nconnecting to AP\r\n");
             
     if(spwf.connect(ssid, seckey, NSAPI_SECURITY_WPA2)) {      
@@ -75,42 +130,46 @@
     const char *mac = spwf.get_mac_address();
     
     pc.printf("\r\nIP Address is: %s\r\n", (ip) ? ip : "No IP");
-    pc.printf("\r\nMAC Address is: %s\r\n", (mac) ? mac : "No MAC");    
-    
-    SocketAddress addr(&spwf, "st.com");   
-    pc.printf("\r\nst.com resolved to: %s\r\n", addr.get_ip_address());    
-
-    pc.printf("\r\nconnecting to http://4.ifcfg.me\r\n");
-    
-    TCPSocket socket(&spwf);
-    err = socket.connect("4.ifcfg.me", 23);
-    if(err!=0) 
-    {
-      pc.printf("\r\nCould not connect to Socket, err = %d!!\r\n", err); 
-      return -1;
-    } else pc.printf("\r\nconnected to host server\r\n"); 
-    
-    char buffer[100];
-    int count = 0;
-    pc.printf("\r\nReceiving Data\r\n"); 
-    count = socket.recv(buffer, sizeof buffer);
+    pc.printf("\r\nMAC Address is: %s\r\n", (mac) ? mac : "No MAC");     
     
-    if(count > 0)
-    {
-        buffer [count]='\0';
-        printf("%s\r\n", buffer);  
+    while(1) 
+    { 
+      wait(20);
+      myled = !myled;
+      calculatePPM();
+      err = sensor.readData();
+        if (err ==DHT11::OK)
+        {
+         temp=sensor.readTemperature();
+         humid=sensor.readHumidity();
+         pc.printf("\r\nT: %d oC, H: %d\r\n",temp,humid);   
+        }
+         else
+         printf("\r\nErr %i \n",err);
+         int err=http_demo();
+         if(err ==0)
+         pc.printf("Thingspeak update completed successfully\r\n");
+         else
+         pc.printf("Error occurred %d\r\n",err);
+       /* buffer[0] = 0;
+        sprintf(buffer, "%s?key=%s&field1=%s&field2=%d&field3=%d", thingSpeakUrl, thingSpeakKey, , (float)ppm,temp,humid);
+        printf("Request to %s\r\n", buffer);
+        
+        HTTPText resp;
+        HTTPResult res = http.get(buffer, &resp);
+        if (res == HTTP_OK)
+        {
+            printf("Result :\"%s\"\r\n", resp.gets());
+        }
+        else
+        {
+            printf("Error %d\r\n", res);
+        } */        
+             
+            
+      
     }
-    else pc.printf("\r\nData not received\r\n");
+    
+ 
+}
 
-    pc.printf("\r\nClosing Socket\r\n");
-    socket.close();
-    pc.printf("\r\nUnsecure Socket Test complete.\r\n");
-    printf ("Socket closed\n\r");
-    spwf.disconnect();
-    printf ("WIFI disconnected, exiting ...\n\r");
-
-    while(1) { 
-      wait(1);
-      myled = !myled;
-    }
-}

diff -r 80d8e97e81f2 -r 9a2016106dae mbed.bld
--- a/mbed.bld	Mon Jan 16 13:26:50 2017 +0000
+++ b/mbed.bld	Sat May 06 17:39:25 2017 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/2e9cc70d1897
\ No newline at end of file
+https://mbed.org/users/mbed_official/code/mbed/builds/856d2700e60b
\ No newline at end of file