Diff: main.cpp

Revision:

0:9ab281898a9b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Mar 20 14:24:06 2015 +0000
@@ -0,0 +1,196 @@
+#include "mbed.h"
+#include "SPI_TFT_ILI9341.h"
+#include "sansSerif19x20.h"
+#include "DHT.h"
+#include "EthernetInterface.h"
+#include "NTPClient.h"
+#include  "HTTPClient.h"
+#include "picojson.h"
+#include "SDFileSystem.h" 
+//IMPORTANT YOU NEED TO SET THE API KEY for thingspeak look for "your key here"
+//TAKE CARE URL doesn't excced buffer size 
+//sd card
+ SDFileSystem sd(PTE3, PTE1, PTE2, PTE4, "sd"); // MOSI, MISO, SCLK, SSEL
+//Ethernet Interface 
+EthernetInterface eth;
+//NTP service for date and Time used to set boards RTC
+NTPClient ntp;
+//HTTP Client for interfacing to web services
+HTTPClient http;
+char resp[1024]; //buffer for the responce
+//On board LED
+DigitalOut myled(LED_GREEN);
+//serial over USB for debug and Info
+Serial pc(USBTX, USBRX);
+//temperature sensor
+DHT sensor(PTB18,DHT22); // there are several libraries available, this reports CRC error sometimes 
+//320x240 Display ILI9341 controller (look on ebay)
+SPI_TFT_ILI9341 TFT(PTD2, PTD3, PTD1,PTC3 ,PTC4 ,PTD0  ,"TFT"); // mosi, miso, sclk, cs, reset, dc
+
+int main()
+{
+    int cnt = 0;
+    int err;
+    int ret=0;
+    char val[4][16];
+    //used to parse the json data
+    picojson::value v;
+    char * json;
+    HTTPMap map;
+    HTTPText inText(resp, 1024);
+    char sdfile[32]; 
+    FILE *fp;
+    pc.printf("Weather Reporter\n");
+
+    
+    //eithernet init
+    eth.init(); //Use DHCP
+    ret= eth.connect();
+     if (!ret) {
+        pc.printf("Connected, IP: %s, MASK: %s, GW: %s\n",
+        eth.getIPAddress(), eth.getNetworkMask(), eth.getGateway());
+    } else {
+        pc.printf("Error eth.connect() - ret = %d\n", ret);
+    }
+
+ 
+    //setup the TFT DISPLAY
+    TFT.claim(stdout);      // send stdout to the TFT display
+    //ensure the output is write and not buffered
+    setvbuf ( stdout , NULL , _IONBF , NULL );
+    //TFT.claim(stderr);      // send stderr to the TFT display
+    TFT.set_orientation(1);
+    TFT.background(Black);    // set background to black
+    //centerx = TFT.width() >> 1;
+    //centery = TFT.height() >> 1; 
+    
+
+    TFT.cls();
+    TFT.locate(0,0);
+    TFT.set_font((unsigned char*) sansserif);
+    //printf will now for to TFT because of the TFT.claim(stdout)
+    printf("Weather Test\n"); 
+   //setup the RTC with date and time 
+    printf("Trying to update time...\r\n");
+    time_t ctTime;
+    NTPResult result;
+    result = ntp.setTime("pool.ntp.org");
+        if (result == NTP_OK) {
+            time(&ctTime);
+            printf("Time is set to (UTC):\n%s\n", ctime(&ctTime));
+            strcpy(sdfile,"/sd/results/default_results"); //could use time in name
+        }else{
+            printf("Error setting Time\n");
+            strcpy(sdfile,"/sd/results/default_results");
+            }
+
+    //write to sdcard, we could use the time and date in the filename defained above to give a new file for every session
+    mkdir("/sd/results", 0777);
+    fp = fopen(sdfile, "w");
+        if (fp == NULL) {
+        pc.printf("Unable to write the file \n");
+        } else {
+          pc.printf("Writing data to SDCARD \n");
+         //time,temp,humidity,forcast,pressure
+         fprintf(fp, "time,temperature,humidity,forcastTemp,forcastPressure\n");
+         fclose(fp);
+     }    
+   
+    float humidity=0;
+    float temperature=-100;
+    float forcastTemp=0;
+    float forcastPressure;
+    wait(10);
+    pc.printf("\r\nDHT Test program");
+    pc.printf("\r\n******************\r\n");
+    wait(1); // wait 1 second for device stable status
+    while(1){
+        
+        //GET forcast data
+        pc.printf("\nTrying to fetch page...\n");
+        //try getting the weather, 5 second timeout     
+        ret = http.get("http://api.openweathermap.org/data/2.5/weather?q=Strathaven,uk", resp, 5000);
+        if(!ret){
+          pc.printf("responce=%s",resp);
+          json=&resp[0];    
+          pc.printf("parsing");
+          string err = picojson::parse(v, json, json + strlen(json));
+          if(err.empty()){
+           forcastTemp=v.get("main").get("temp").get<double>();
+           forcastTemp=forcastTemp-273.15;
+           forcastPressure=v.get("main").get("pressure").get<double>();
+          // printf("Forcast temp: %f\n", forcastTemp);
+          }
+          else{
+              pc.printf("error parsing");
+         }    
+       }
+       else{
+         pc.printf("ERROR=%d", ret);
+      }    
+        
+    err = sensor.readData();
+        if (err == 0) {
+            TFT.cls();
+            TFT.locate(0,0);
+            time(&ctTime);
+            printf("%s\n", ctime(&ctTime));
+            temperature=sensor.ReadTemperature(CELCIUS);
+            humidity=sensor.ReadHumidity();
+            printf("Temperature:  %4.2f C \r\n",temperature);
+            printf("Forcast Temp: %4.2f C \r\n",forcastTemp);  
+            printf("Temperature is %4.2f F \r\n",sensor.ReadTemperature(FARENHEIT));
+            printf("Humidity is %4.2f \r\n",humidity);
+            printf("Dew point is %4.2f  \r\n",sensor.CalcdewPoint(sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity()));
+            printf("Forcast Pressure: %4.2f C \r\n",forcastPressure);  
+            myled = 1;
+        } else{
+            pc.printf("\r\nErr %i \n",err);
+            myled = 0;
+         }   
+        
+        
+   //sent to thingsspeak
+    if(cnt==10){ //don't update as often 
+      cnt=0;  
+      memset(resp, '\0', sizeof(resp));
+    //POST data
+      if(temperature!=-100){ //just check we have a valid temp
+        map.put("api_key","YOUR KEY HERE");
+        sprintf(val[0],"%4.1f",temperature);
+        map.put("field1", val[0]);
+        sprintf(val[1],"%4.1f",humidity);
+        map.put("field2", val[1]);
+        sprintf(val[2],"%4.1f",forcastTemp);
+        map.put("field3", val[2]);
+        sprintf(val[3],"%4.1f",forcastPressure); 
+        map.put("field4", val[3]);
+        pc.printf("\nTrying to post data...\n");
+        ret = http.post("https://api.thingspeak.com/update", map, &inText);
+        if (!ret)
+        {
+          pc.printf("Executed POST successfully - read %d characters\n", strlen(resp));
+          pc.printf("Result: %s\n", resp);
+        }
+         else
+        {
+         pc.printf("Error - ret = %d - HTTP return code = %d\n", ret, http.getHTTPResponseCode());
+        }
+       //Write Data to SDCARD
+        fp = fopen(sdfile, "a");
+        if (fp == NULL) {
+        pc.printf("Unable to write the file \n");
+        } else {
+          pc.printf("Writing data to SDCARD \n");
+         //time,temp,humidity,forcast,pressure
+         fprintf(fp, "%s,%4.1f,%4.1f,%4.1f,%4.1f\n", ctime(&ctTime),temperature,humidity,forcastTemp,forcastPressure);
+         fclose(fp);
+        } 
+     }
+     
+    }
+    
+    cnt++;
+    wait_ms(6000);
+  }      
+}