jim hamblen
Displays weather info on text LCD using Google API
Dependencies: NetServices TextLCD mbed spxml HTTPClient_ToBeRemoved
Revision 0:537d849c3d8c, committed 2012-04-21
- Comitter:
- 4180_1
- Date:
- Sat Apr 21 03:45:58 2012 +0000
- Commit message:
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPClient.lib Sat Apr 21 03:45:58 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/HTTPClient/#d0be6af2d1db
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NetServices.lib Sat Apr 21 03:45:58 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/segundo/code/NetServices/#966a0265edfc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCD.lib Sat Apr 21 03:45:58 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/simon/code/TextLCD/#44f34c09bd37
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat Apr 21 03:45:58 2012 +0000
@@ -0,0 +1,84 @@
+#include "mbed.h"
+#include "EthernetNetIf.h"
+#include "HTTPClient.h"
+#include "spdomparser.hpp"
+#include "spxmlnode.hpp"
+#include "spxmlhandle.hpp"
+#include "TextLCD.h"
+// Internet of Things weather display example: LCD displays LA current weather via internet Google API
+// Adapted for LCD from http://mbed.org/users/hlipka/programs/spxmltest_weather/lif782
+TextLCD lcd(p15, p16, p17, p18, p19, p20); // rs, e, d0-d3
+EthernetNetIf eth;
+HTTPClient http;
+HTTPResult result;
+bool completed = false;
+void request_callback(HTTPResult r) {
+ result = r;
+ completed = true;
+}
+
+void parseWeather(SP_XmlElementNode *node) {
+ //extracts current weather XML data fields for LCD
+ SP_XmlHandle handle(node);
+ SP_XmlElementNode * condition = handle.getChild( "condition" ).toElement();
+ lcd.cls();
+ lcd.printf("LA:");
+ if (condition) {
+ lcd.printf("%s ",condition->getAttrValue("data"));
+ }
+ SP_XmlElementNode * tempf = handle.getChild( "temp_f" ).toElement();
+ if (tempf) {
+ lcd.printf(" %sF\n",tempf->getAttrValue("data"));
+ }
+ SP_XmlElementNode * humidity = handle.getChild( "humidity" ).toElement();
+ if (humidity) {
+ lcd.printf("%s",humidity->getAttrValue("data"));
+ }
+}
+
+int main() {
+ // the eth and HTTP code has be taken directly from the HTTPStream documentation page
+ // see http://mbed.org/cookbook/HTTP-Client-Data-Containers
+ lcd.cls();
+ lcd.printf("net setup");
+ EthernetErr ethErr = eth.setup();
+ if (ethErr) {
+ lcd.printf("\n\rError in setup");
+ return -1;
+ }
+ lcd.printf("\n\r net ok");
+
+ SP_XmlDomParser parser;
+ HTTPStream stream;
+
+ char BigBuf[512 + 1] = {0};
+ stream.readNext((byte*)BigBuf, 512); //Point to buffer for the first read
+ //Google Weather API for Los Angeles - get web page with XML
+ HTTPResult r = http.get("http://www.google.com/ig/api?weather=Los+Angeles", &stream, request_callback);
+ while (!completed) {
+ Net::poll(); //Polls the Networking stack
+ if (stream.readable()) {
+ BigBuf[stream.readLen()] = 0; //Transform this buffer in a zero-terminated char* string
+ parser.append( BigBuf, strlen(BigBuf)); // stream current buffer data to the XML parser
+ stream.readNext((byte*)BigBuf, 512); //Buffer has been read, now we can put more data in it
+ }
+ }
+ lcd.cls();
+ if (result == HTTP_OK) {
+ lcd.printf(" Read complete\n\r");
+ } else {
+ lcd. printf(" Error %d\n", result);
+ return -1;
+ }
+
+ SP_XmlHandle rootHandle( parser.getDocument()->getRootElement() );
+ SP_XmlElementNode * child2 = rootHandle.getChild( "weather" )
+ .getChild( "current_conditions").toElement();
+ if ( child2 ) {
+ parseWeather(child2); //parses XML "current-conditions" info
+ }
+
+ if ( NULL != parser.getError() ) {
+ lcd.printf( "\n error: %s\n", parser.getError() );
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Apr 21 03:45:58 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/spxml.lib Sat Apr 21 03:45:58 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/hlipka/code/spxml/#3fa97f2c0505