I'm not having any luck tonight 
I started off by stripping down a sketch to control the TLC and a second one to serve a simple webpage with on/off buttons for a digital output. Both of these work fine on their own with all the hardware connected together (Arduino pin 10 being shared by the TLC & Ethernet shield).
TLC code:
#include "Tlc5940.h"
void setup()
{
Tlc.init(0);
}
void loop()
{
Tlc.set(1, 4095);
Tlc.set(2, 2000);
Tlc.set(3, 1000);
Tlc.update();
delay(100);
}
Ethernet code:
// http://code.google.com/p/arduino/issues/detail?id=605
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = { 192, 168, 0, 177 }; // ip in lan
byte gateway[] = { 192, 168, 1, 1 }; // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
EthernetServer server(80); //server port
String readString;
//////////////////////
void setup(){
pinMode(7, OUTPUT); //pin selected to control
//start Ethernet
Ethernet.begin(mac, ip, gateway, subnet);
server.begin();
}
void loop(){
// Create a client connection
EthernetClient client = server.available();
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();
//read char by char HTTP request
if (readString.length() < 100) {
//store characters to string
readString += c;
//Serial.print(c);
}
//if HTTP request has ended
if (c == '\n') {
///////////////
client.println("HTTP/1.1 200 OK"); //send new page
client.println("Content-Type: text/html");
client.println();
client.println("<HTML>");
client.println("<HEAD>");
client.println("<meta name='apple-mobile-web-app-capable' content='yes' />");
client.println("<meta name='apple-mobile-web-app-status-bar-style' content='black-translucent' />");
client.println("<link rel='stylesheet' type='text/css' href='http://homeautocss.net84.net/a.css' />");
client.println("<TITLE>Home Automation</TITLE>");
client.println("</HEAD>");
client.println("<BODY>");
client.println("<H1>Home Automation</H1>");
client.println("<hr />");
client.println("
");
client.println("<a href=\"/?lighton\"\">Turn On Light</a>");
client.println("<a href=\"/?lightoff\"\">Turn Off Light</a>
");
client.println("</BODY>");
client.println("</HTML>");
delay(1);
//stopping client
client.stop();
///////////////////// control arduino pin
if(readString.indexOf("?lighton") >0)//checks for on
{
digitalWrite(7, HIGH); // set pin 4 high
}
else{
if(readString.indexOf("?lightoff") >0)//checks for off
{
digitalWrite(7, LOW); // set pin 4 low
}
}
//clearing string for next read
readString="";
}
}
}
}
}
I since they were working, I combined them together and tested. The TLC output & arduino pin 7 turn on fine from the webpage, but when I tell it to turn off the arduino hangs and I get a 404 error on the web browser?
Combined code:
// http://code.google.com/p/arduino/issues/detail?id=605
#include <SPI.h>
#include <Ethernet.h>
#include "Tlc5940.h"
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = {
192, 168, 0, 177 }; // ip in lan
byte gateway[] = {
192, 168, 1, 1 }; // internet access via router
byte subnet[] = {
255, 255, 255, 0 }; //subnet mask
EthernetServer server(80); //server port
String readString;
//////////////////////
void setup(){
Tlc.init(0);
pinMode(7, OUTPUT); //pin selected to control
//start Ethernet
Ethernet.begin(mac, ip, gateway, subnet);
server.begin();
}
void loop(){
// Create a client connection
EthernetClient client = server.available();
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();
//read char by char HTTP request
if (readString.length() < 100) {
//store characters to string
readString += c;
//Serial.print(c);
}
//if HTTP request has ended
if (c == '\n') {
///////////////
client.println("HTTP/1.1 200 OK"); //send new page
client.println("Content-Type: text/html");
client.println();
client.println("<HTML>");
client.println("<HEAD>");
client.println("<meta name='apple-mobile-web-app-capable' content='yes' />");
client.println("<meta name='apple-mobile-web-app-status-bar-style' content='black-translucent' />");
client.println("<link rel='stylesheet' type='text/css' href='http://homeautocss.net84.net/a.css' />");
client.println("<TITLE>Home Automation</TITLE>");
client.println("</HEAD>");
client.println("<BODY>");
client.println("<H1>Home Automation</H1>");
client.println("<hr />");
client.println("
");
client.println("<a href=\"/?lighton\"\">Turn On Light</a>");
client.println("<a href=\"/?lightoff\"\">Turn Off Light</a>
");
client.println("</BODY>");
client.println("</HTML>");
delay(1);
//stopping client
client.stop();
///////////////////// control arduino pin
if(readString.indexOf("?lighton") >0)//checks for on
{
digitalWrite(7, HIGH);
Tlc.set(1, 4095);
Tlc.update();
delay(50);
}
else if(readString.indexOf("?lightoff") >0)//checks for off
{
digitalWrite(7, LOW);
Tlc.set(1, 0);
Tlc.update();
delay(50);
}
//clearing string for next read
readString="";
}
}
}
}
}
I thought this must be a conflict on arduino PIN10 between the shield and TLC so I tried to change the pin mapping in the xx8 pinout file of the TLC lib to PB0 (pin 9 is in use by the TLC already) but I get no output from the TLC, but if I connect the blank pin back to pin 10 then it sill works?