Simon Ford
Example of a simple website hits/signup traffic monitor to drive a display (e.g. servo or panel meter) and indicator (e.g. bell, solenoid) based on responses from a webserver
Dependencies: EthernetNetIf mbed Servo
Revision 0:3c13cc3b4e30, committed 2011-01-10
- Comitter:
- simon
- Date:
- Mon Jan 10 18:10:05 2011 +0000
- Commit message:
- First simple example
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/EthernetNetIf.lib Mon Jan 10 18:10:05 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/EthernetNetIf/#bc7df6da7589
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPClient.lib Mon Jan 10 18:10:05 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/HTTPClient/#d0be6af2d1db
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Servo.lib Mon Jan 10 18:10:05 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/simon/code/Servo/#36b69a7ced07
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebTrafficMonitor.cpp Mon Jan 10 18:10:05 2011 +0000
@@ -0,0 +1,70 @@
+// Example of a simple website hits/signup traffic monitor to drive
+// a display (e.g. servo or panel meter) and indicator (e.g. bell, solenoid)
+// based on responses from a webserver
+// http://mbed.org
+
+#include "mbed.h"
+#include "EthernetNetIf.h"
+#include "HTTPClient.h"
+#include "Servo.h"
+
+#define SIGNUPS_URL "http://url-returning-signups-int" // number of signups since last checked
+#define HITS_URL "http://url-returning-hits-int" // number of hits/sec since last checked
+#define HITS_MAX 1000 // scale max hits/sec
+
+EthernetNetIf eth;
+HTTPClient http;
+
+DigitalOut bell(p12);
+Servo meter(p21);
+
+// ding a bell (fire a digital out driving a solenoid)
+void ding() {
+ bell = 1;
+ wait(0.25);
+ bell = 0;
+}
+
+// fetch a integer from a url
+int get_result(char *url) {
+ HTTPText txt;
+ HTTPResult r = http.get(url, &txt);
+
+ if(r != HTTP_OK) {
+ printf("Error [%d] fetching url [%s]\n", r, url);
+ return -1;
+ }
+
+ printf("Response [%s] from url [%s]\n", txt.gets(), url);
+ int v = 0;
+ if(sscanf(txt.gets(), "%d", &v) != 1) {
+ printf("Could not convert value to int\n");
+ }
+
+ return v;
+}
+
+int main() {
+ printf("Setup the network...\n");
+ EthernetErr ethErr = eth.setup();
+ if (ethErr) {
+ error("Error %d in setup\n", ethErr);
+ }
+ printf("OK!\n");
+
+ while (1) {
+ int hits = get_result(HITS_URL);
+ int signups = get_result(SIGNUPS_URL);
+
+ printf("hits = %d, signups = %d\n", hits, signups);
+
+ // ding for every signup since last request
+ for(int i=0; i<signups; i++) {
+ ding();
+ wait(0.5);
+ }
+
+ // set the servo based on hits/sec
+ meter = (float)hits / (float)HITS_MAX;
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Jan 10 18:10:05 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/9114680c05da