Diff: main.cpp

Revision:

0:d064b9670483

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Mar 20 04:52:46 2015 +0000
@@ -0,0 +1,123 @@
+/* Copyright (c) 2010-2011 mbed.org, MIT License
+*  
+* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+* and associated documentation files (the "Software"), to deal in the Software without
+* restriction, including without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
+* Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or
+* substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+#include "mbed.h"
+#include "WiflyInterface.h"
+#include "Websocket.h"
+
+/*
+ * Mokoversity Farm Team
+ *
+ * ARM mbed IoT workshop at Taipei / Shenzhen.
+ * For more information, please see https://www.mokoversity.com/farm
+ */
+
+
+/*
+ * Sensor Device
+ */ 
+ 
+// System status
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+
+// Temperature sensor at A0
+AnalogIn    temp(P0_23);
+
+/**
+ * WiFi Device - Seeed WiFi Shield
+ *
+ * D1 - TX pin (RX on the WiFi side)
+ * D0 - RX pin (TX on the WiFi side)
+ * NC - Reset pin; use D5 otherwise the shield might get into reset loop
+ * LED1 - TCP status pin
+ * "ssid" - hostspot name
+ * "password" - hotspot passowrd
+ * security method - NONE, WEP_128, WPA
+ */
+WiflyInterface eth(D1, D0, D5, LED4, "<HOTSPOT>", "<PASSWORD>", WPA);
+
+/*
+ * Global Variables
+ */ 
+int     a;
+float   temperature;
+int     B = 3975;       //B value of the thermistor                                                    
+float   resistance;
+
+int main() 
+{
+    char data[256];
+    int ret;
+
+    wait(3);
+    
+    // init status
+    led1 = 0;
+    led2 = 0;
+    led3 = 0;
+    
+    //Use DHCP
+    ret = eth.init(); 
+    //eth.init("192.168.21.45","255.255.255.0","192.168.21.2");
+    if (ret != NULL) {
+        led1 = 0;
+        led2 = 1;
+        led3 = 0;
+        led4 = 1;
+        
+        exit(0);
+    }
+    
+    while (1) {
+        ret = eth.connect();
+        
+        if (ret == false || ret < 0) {
+            led1 = !led1;
+            wait(1);
+        } else {
+            led1 = 1;
+            break;
+        }
+    }
+    
+    /*
+     * We use WoT.City Websocket channel service.
+     * See: https://www.mokoversity.com/wotcity
+     */
+    Websocket ws("ws://wot.city/object/jollentemp1/send");
+    while( !ws.connect() );
+    led2 = 1;
+    
+    while(1) {
+        // multiply ain by 675 if the Grove shield is set to 5V or 1023 if set to 3.3V
+        a = temp * 675;
+        
+        // get resistance value of the sensor
+        resistance = (float)(1023-a)*10000/a;       
+        
+        //convert resistance value to temperature via datasheet                  
+        temperature = 1 / (log(resistance/10000)/B+1/298.15) - 273.15;    
+
+        wait(0.8);
+        
+        sprintf( data , "{ \"temperature\": %f }",temperature);
+        ws.send(data);
+    }
+}