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+/* Web_Buzzer.pde - example sketch for Webduino library */
+
+#include "SPI.h"
+#include "Ethernet.h"
+#include "WebServer.h"
+
+/* CHANGE THIS TO YOUR OWN UNIQUE VALUE. The MAC number should be
+ * different from any other devices on your network or you'll have
+ * problems receiving packets. */
+static uint8_t mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
+
+/* CHANGE THIS TO MATCH YOUR HOST NETWORK. Most home networks are in
+ * the 192.168.0.XXX or 192.168.1.XXX subrange. Pick an address
+ * that's not in use and isn't going to be automatically allocated by
+ * DHCP from your router. */
+static uint8_t ip[] = { 192, 168, 1, 210 };
+
+/* all URLs on this server will start with /buzz because of how we
+ * define the PREFIX value. We also will listen on port 80, the
+ * standard HTTP service port */
+#define PREFIX "/buzz"
+WebServer webserver(PREFIX, 80);
+
+/* the piezo speaker on the Danger Shield is on PWM output pin #3 */
+#define BUZZER_PIN 3
+
+/* this is the number of microseconds to wait after turning the
+ * speaker on before turning it off. */
+int buzzDelay = 0;
+
+/* toggle is used to only turn on the speaker every other loop
+iteration. */
+char toggle = 0;
+
+/* This command is set as the default command for the server. It
+ * handles both GET and POST requests. For a GET, it returns a simple
+ * page with some buttons. For a POST, it saves the value posted to
+ * the buzzDelay variable, affecting the output of the speaker */
+void buzzCmd(WebServer &server, WebServer::ConnectionType type, char *url_tail, bool tail_complete)
+{
+ if (type == WebServer::POST)
+ {
+ bool repeat;
+ char name[16], value[16];
+ do
+ {
+ /* readPOSTparam returns false when there are no more parameters
+ * to read from the input. We pass in buffers for it to store
+ * the name and value strings along with the length of those
+ * buffers. */
+ repeat = server.readPOSTparam(name, 16, value, 16);
+
+ /* this is a standard string comparison function. It returns 0
+ * when there's an exact match. We're looking for a parameter
+ * named "buzz" here. */
+ if (strcmp(name, "buzz") == 0)
+ {
+ /* use the STRing TO Unsigned Long function to turn the string
+ * version of the delay number into our integer buzzDelay
+ * variable */
+ buzzDelay = strtoul(value, NULL, 10);
+ }
+ } while (repeat);
+
+ // after procesing the POST data, tell the web browser to reload
+ // the page using a GET method.
+ server.httpSeeOther(PREFIX);
+ return;
+ }
+
+ /* for a GET or HEAD, send the standard "it's all OK headers" */
+ server.httpSuccess();
+
+ /* we don't output the body for a HEAD request */
+ if (type == WebServer::GET)
+ {
+ /* store the HTML in program memory using the P macro */
+ P(message) =
+ "<html><head><title>Webduino Buzzer Example</title>"
+ "<body>"
+ "<h1>Test the Buzzer!</h1>"
+ "<form action='/buzz' method='POST'>"
+ "<p><button name='buzz' value='0'>Turn if Off!</button></p>"
+ "<p><button name='buzz' value='500'>500</button></p>"
+ "<p><button name='buzz' value='1975'>1975</button></p>"
+ "<p><button name='buzz' value='3000'>3000</button></p>"
+ "<p><button name='buzz' value='8000'>8000</button></p>"
+ "</form></body></html>";
+
+ server.printP(message);
+ }
+}
+
+void setup()
+{
+ // set the PWM output for the buzzer to out
+ pinMode(BUZZER_PIN, OUTPUT);
+
+ // setup the Ehternet library to talk to the Wiznet board
+ Ethernet.begin(mac, ip);
+
+ /* register our default command (activated with the request of
+ * http://x.x.x.x/buzz */
+ webserver.setDefaultCommand(&buzzCmd);
+
+ /* start the server to wait for connections */
+ webserver.begin();
+}
+
+void loop()
+{
+ // process incoming connections one at a time forever
+ webserver.processConnection();
+
+ /* every other time through the loop, turn on and off the speaker if
+ * our delay isn't set to 0. */
+ if ((++toggle & 1) && (buzzDelay > 0))
+ {
+ digitalWrite(BUZZER_PIN, HIGH);
+ delayMicroseconds(buzzDelay);
+ digitalWrite(BUZZER_PIN, LOW);
+ }
+}