This is somewhat similar problem to what another poster queried about in May (Get XBee response from Serial and send to a browser), but the approach is so different, that it is another situation.
I've recently gotten the Ethernet shield to work both on my home network (the 192.168.1.101) address as well as on the net (using my computer's IP address with :8081 port). I'm trying to integrate XBee, which works fine if I'm sending data from one Arduino with an XBee shield to my computer (either to another XBee on a dongle to X-CTU monitor or onto the Arduino serial monitor. When I try stacking them both, here is what happens:
On the 192.168.1.101 (home networking) the page is unavailable, and the serial monitor shows no connection attempts from client.
On the net, with my computer's IP address followed by : port number (http://108.xxx.xx.xxx:8081), the Arduino serial monitor acknowledges a client:
server is at 192.168.1.101
new client
GET / HTTP/1.1
Host: 108.xxx.xx.xxx:8081
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36
DNT: 1
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8
And it stops there. On the net end, it just stays in "Waiting for...." mode and never switches to either the page or the "This page is unavailable" page.
I'm assuming that it has something to do with syntax regarding the char from the XBee. I'm a newbie, so I only have the faintest understanding of how the core structures work here.
#include <SPI.h>
#include <Ethernet.h>
#include <SoftwareSerial.h>
// XBee's DOUT (TX) is connected to pin 2 (Arduino's Software RX)
// XBee's DIN (RX) is connected to pin 3 (Arduino's Software TX)
SoftwareSerial XBee(2, 3); // RX, TXint ReadingNumber=0;
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0x90, 0xA2, 0xDA, 0x0D, 0xA8, 0x6B
};
IPAddress ip(192, 168, 1, 101);
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(8081);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
XBee.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
}
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
client.println("Refresh: 5"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
if (XBee.available())
{
if (c == '\n' && currentLineIsBlank) {
client.println (XBee.read());
}
}
break;
}
else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}
Related
I'm trying to run the WebServer example below from the Arduino IDE using an Ethernet shield (Wiznet W5100) that is stacked on top of an Arduino Uno R3. The Ethernet shield is connected using an RJ45 cable to an Internet router. After uploading the code to the board, I see that the requested IP address (192.168.1.177) is printed to the console. The strange behavior that I'm facing here is that when I ping the IP address, I get a response indicating that the IP is reachable from my laptop. Also, I see the Tx, Rx LED lights blinking thereby indicating that the board is receiving the ping msgs and replying to them. This means that the board successfully received an IP address and is now connected to the LAN. However, when I try to access the same IP from the browser to receive the HTML page, no response is returned and the browser takes around 30 seconds displaying loading before returning site not reachable message. I tried different browsers from both the laptop and an iPhone connected to the same LAN with no luck in receiving the web page. Any hint as to what the problem could be is highly appreciated.
See below the code and a picture for the Ethernet shield during the experiment.
/*
Web Server
A simple web server that shows the value of the analog input pins.
using an Arduino Wiznet Ethernet shield.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
* Analog inputs attached to pins A0 through A5 (optional)
created 18 Dec 2009
by David A. Mellis
modified 9 Apr 2012
by Tom Igoe
modified 02 Sept 2015
by Arturo Guadalupi
*/
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(192, 168, 1, 177);
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
}
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
client.println("Refresh: 5"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
// output the value of each analog input pin
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print("analog input ");
client.print(analogChannel);
client.print(" is ");
client.print(sensorReading);
client.println("<br />");
}
client.println("</html>");
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
} else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}
To those who come later here for the same problem, it appeared that there was an issue with the DHCP of the Internet router. It seems like my router's DHCP was not stable when providing IP addresses for devices connected through the Ethernet ports. I replaced the router and the problem went away.
I have been trying to setup a web server using Arduino. I have an UNO and a HanRun HR91105A I got off the internet, and I am using a modified version of the WebServer example to test my code. It did in fact work at first. But after setting up port forwarding, the connection suddenly became unstable. It connects and works for a few minutes, then suddenly I can't even ping it. Trying to ping the Arduino results in request time out. Research online suggests 2 possibilities:
1.) All the RAM is used up
2.) Ethernet shield is faulty
Below is my code
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0x44, 0x00, 0x10, 0x20, 0x8C, 0x0A
};
IPAddress ip(192,168,1,90);
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(8081);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
}
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close");
client.println("Refresh: 2");
client.println();
client.println("<!DOCTYPE HTML>");
//-----------------Type in outputs below-------------------------------------
client.println("<html>");
client.print("Hello World!");
client.print("<p id='Header'>");
client.print("Sensor Data");
client.println("</p>");
client.print("<p id='Pressure'>");
client.print("Pressure:");
client.println("</p>");
client.print("<p id='Acceleration'>");
client.print("Acceleration:");
client.println("</p>");
client.println("<br /)");
client.println("</html>");
break;
//-----------------End of outputs--------------------------------------------
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
} else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}
Additionally, the arduino does have a static IP, so I'm pretty sure it is not an issue of DHCP lease expiry.
I highly suspect that the shield is faulty as it gets very hot while in operation. Plus it IS a knockoff. But I can't dismiss the possibility that my coding is just inefficient as I am not very experienced. Any help would be appreciated. Thanks.
Your Arduino will opperate unpredictably when RAM is not enough.
In this code, there are many constant string. you should store those strings in FLASH memory to save RAM. In order to to so, use F() macro. For example.
client.println(F("HTTP/1.1 200 OK"));
If your program is big, I recommend to use the shield that equips an embedded web sever (e.g PHPoC Shield)
I've recently bought an Arduino ethernet shield but couldn't get it work.
I've tried to use the example's code but it did not work. I have even tried to get a static IP without DHCP and it's always the same problem .
I've used this code :
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = { 0x90, 0xA2, 0xDA, 0x0F, 0xE1, 0xBF };
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
char server[] = "www.google.com"; // name address for Google (using DNS)
// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(192,168,1,10);
// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// start the Ethernet connection:
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// no point in carrying on, so do nothing forevermore:
// try to congifure using IP address instead of DHCP:
Ethernet.begin(mac, ip);
}
// give the Ethernet shield a second to initialize:
delay(1000);
Serial.println("connecting...");
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println("connected");
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.1");
client.println("Host: www.google.com");
client.println("Connection: close");
client.println();
}
else {
// kf you didn't get a connection to the server:
Serial.println("connection failed");
}
}
void loop()
{
// if there are incoming bytes available
// from the server, read them and print them:
if (client.available()) {
char c = client.read();
Serial.print(c);
}
// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
client.stop();
// do nothing forevermore:
while(true);
}
}
and I got this answer:
Failed to configure Ethernet using DHCP
connecting...
connected
disconnecting.
How can I be sure that my ethernet shield is working correctly and how can I resolve this problem?
With a failed DHCP you don't have DNS address to resolve "www.google.com".
Modify your code like this and try again :
IPAddress server(74,125,232,128);
//char server[] = "www.google.com";
I'm trying to connect my Arduino uno + Ethernet shield to a php script that gets a value from a database and then is sent back which then is displayed on a serial monitor. It works, it connects successfully and i get the value sent back however I'm having trouble displaying it on the serial monitor. It should just display what the server sends however it doesn't. Any one can help?
The Serial Output : It should just output "The Value", however there are numbers that shouldn't be there. If i output this to a LCD monitor i can't have them numbers present.
connecting...
connected
HTTP/1.1 200 OK
Server: cloudflare-nginx
Date: Sat, 04 Jan 2014 15:36:51 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: close
Set-Cookie: __cfduid=dcef101052b82760c1a2de019e6b076141388849811461; expires=Mon, 23-Dec-2019 23:50:00 GMT; path=/; domain=.linku.biz; HttpOnly
X-Powered-By: PHP/5.3.27
CF-RAY: e7901b6dec606e2
4
The
5
Value
0
disconnecting.
PHP Script
<?php
echo 'The Value';
?>
Arduino Script
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
char server[] = "www.linku.biz"; // name address for Google (using DNS)
// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(192,168,0,177);
// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// start the Ethernet connection:
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// no point in carrying on, so do nothing forevermore:
// try to congifure using IP address instead of DHCP:
Ethernet.begin(mac, ip);
}
// give the Ethernet shield a second to initialize:
delay(1000);
Serial.println("connecting...");
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println("connected");
// Make a HTTP request:
client.println("GET /arduino.php HTTP/1.1");
client.println("Host: www.linku.biz");
client.println("Connection: close");
client.println();
}
else {
// kf you didn't get a connection to the server:
Serial.println("connection failed");
}
}
void loop()
{
// if there are incoming bytes available
// from the server, read them and print them:
if (client.available()) {
char c = client.read();
Serial.print(c);
}
// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
client.stop();
// do nothing forevermore:
while(true);
}
}
Don't know if this helps, but notice that the numbers are the count of available chars which are read out. 4 "The " and 5 "value"
I would expect that client.available returns the 4 and 5 values just after those chars are received. How they got converted to ASCI "4" and "5" and printed, I have no idea.
I parse data by this code
String readString;
//gets byte from ethernet buffer
readString += client.read(); //places captured byte in
//parse readString for request
index = readString.indexOf("text"); //finds location of first "text"
data_want = readString.substring(index+some char, index+some char); //captures data String
Serial.println(data_wand);
I have a brand new Ethernet shield on Arduino Uno and have worked through many (non-Ethernet) examples without any issues, until I tried to use the Ethernet shield.
Using the provided EthernetClient example, I get a connection failed. The return code is -5 (and I could only find answers for -4 through 1).
/*
Web client
This sketch connects to a website (http://www.google.com)
using an Arduino Wiznet Ethernet shield.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
Created 18 Dec 2009
Modified 9 Apr 2012
by David A. Mellis
*/
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = {0x90, 0xA2, 0xDA, 0x0D, 0x4E, 0x71 };;
char server[] = "google.com"; // Google
// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// Start the Ethernet connection:
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// no point in carrying on, so do nothing forevermore:
for(;;)
;
}
// Give the Ethernet shield a second to initialize:
delay(1000);
Serial.println("connecting...");
Serial.println("Obtaining local IP address");
IPAddress myIPAddress = Ethernet.localIP();
Serial.println(myIPAddress);
// if you get a connection, report back via serial:
int ret = client.connect(server, 80);
if (ret == 1) {
Serial.println("connected");
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.0");
client.println();
}
else {
// kf you didn't get a connection to the server:
Serial.println("Connection failed");
Serial.println(ret);
Serial.println(client.status());
}
}
void loop()
{
// If there are incoming bytes available
// from the server, read them and print them:
if (client.available()) {
char c = client.read();
Serial.print(c);
}
// If the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("Disconnecting.");
client.stop();
// Do nothing forevermore:
for(;;)
;
}
}
The results are always:
Connecting...
Obtaining local IP address
192.168.0.7
Connection failed
-5
0
disconnecting.
Not sure why this helped, but adding a delay after the Serial is intialized, before beginning Ethernet, and also increasing the delay before using Ethernet seemed to work.
/*
Web client
This sketch connects to a website (http://www.google.com)
using an Arduino Wiznet Ethernet shield.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
created 18 Dec 2009
modified 9 Apr 2012
by David A. Mellis
*/
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = {0x90, 0xA2, 0xDA, 0x0D, 0x4E, 0x71 };;
char server[] = "google.com"; // Google
// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
delay(5000);
// start the Ethernet connection:
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// no point in carrying on, so do nothing forevermore:
for(;;)
;
}
// give the Ethernet shield a second to initialize:
delay(5000);
Serial.println("connecting...");
Serial.println("Obtaining local IP");
IPAddress myIPAddress = Ethernet.localIP();
Serial.println(myIPAddress);
// if you get a connection, report back via serial:
int ret = client.connect(server, 80);
if (ret == 1) {
Serial.println("connected");
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.0");
client.println();
}
else {
// kf you didn't get a connection to the server:
Serial.println("connection failed");
Serial.println(ret);
Serial.println(client.status());
}
}
void loop()
{
// if there are incoming bytes available
// from the server, read them and print them:
if (client.available()) {
char c = client.read();
Serial.print(c);
}
// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
client.stop();
// do nothing forevermore:
for(;;)
;
}
}
That Google IP address (173.194.33.104) is not valid now. Try to use 74.125.226.242 instead:
IPAddress server(74,125,226,242); // Google
And before your try it on Arduino, ensure your can open this IP address in your browser:
http://74.125.226.242
Try defining the server IP address as it is shown on the Arduino Reference Page:
byte server[] = { 64, 233, 187, 99 }; // Google
Try a couple different example programs. There have been some revisions with the move to IDE 1.0 that could affect compatibility.