I am currently trying to upload an image from my SD card to a web server hosted by my WiFi shield. I am using an UNO as a micro controller. I am very new when it comes to the coding and manipulated an Ethernet shield code to work with the WiFi shield. The only issue is that it doesn't progress when it tries to connect to the wireless network. Can anyone help me with this? Thank you in advance.
#include <SPI.h>
#include <WiFi.h>
#include <SD.h>
// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ 20
// MAC address from Ethernet shield sticker under board
//byte mac[6];
char ssid[] = "FIU_WiFi"; // your network SSID (name)
//char pass[] = "secretPassword"; // your network password
int keyIndex = 0;
WiFiServer server(80); // create a server at port 80
File webFile;
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0; // index into HTTP_req buffer
int status = WL_IDLE_STATUS;
void setup()
{
// disable Ethernet chip
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
Serial.begin(9600); // for debugging
// initialize SD card
Serial.println("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("ERROR - SD card initialization failed!");
return; // init failed
}
Serial.println("SUCCESS - SD card initialized.");
// check for index.htm file
if (!SD.exists("index.htm")) {
Serial.println("ERROR - Can't find index.htm file!");
return; // can't find index file
}
Serial.println("SUCCESS - Found index.htm file.");
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while(true);
}
// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid);
// wait 10 seconds for connection:
delay(6000);
}
server.begin();
//printWifiStatus();
}
void loop()
{
WiFiClient client = server.available(); // try to get client
if (client) { // got client?
Serial.println("new client");
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) { // client data available to read
char c = client.read(); // read 1 byte (character) from client
// buffer first part of HTTP request in HTTP_req array (string)
// leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
if (req_index < (REQ_BUF_SZ - 1)) {
HTTP_req[req_index] = c; // save HTTP request character
req_index++;
}
// print HTTP request character to serial monitor
Serial.print(c);
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == '\n' && currentLineIsBlank) {
// open requested web page file
if (StrContains(HTTP_req, "GET / ")
|| StrContains(HTTP_req, "GET /index.htm")) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connnection: close");
client.println();
webFile = SD.open("index.htm"); // open web page file
}
else if (StrContains(HTTP_req, "GET /page2.htm")) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connnection: close");
client.println();
webFile = SD.open("page2.htm"); // open web page file
}
else if (StrContains(HTTP_req, "GET /pic.jpg")) {
webFile = SD.open("pic.jpg");
if (webFile) {
client.println("HTTP/1.1 200 OK");
client.println();
}
}
if (webFile) {
while(webFile.available()) {
client.write(webFile.read()); // send web page to client
}
webFile.close();
}
// reset buffer index and all buffer elements to 0
req_index = 0;
StrClear(HTTP_req, REQ_BUF_SZ);
break;
}
// every line of text received from the client ends with \r\n
if (c == '\n') {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != '\r') {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1); // give the web browser time to receive the data
client.stop(); // close the connection
} // end if (client)
}
// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
for (int i = 0; i < length; i++) {
str[i] = 0;
}
}
// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
char found = 0;
char index = 0;
char len;
len = strlen(str);
if (strlen(sfind) > len) {
return 0;
}
while (index < len) {
if (str[index] == sfind[found]) {
found++;
if (strlen(sfind) == found) {
return 1;
}
}
else {
found = 0;
}
index++;
}
return 0;
}
This is the message I am recieving.
Initializing SD card...
SUCCESS - SD card initialized.
SUCCESS - Found index.htm file.
Attempting to connect to SSID: FIU_WiFi
#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>
// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ 20
// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 0, 20); // IP address, may need to change depending on network
EthernetServer server(80); // create a server at port 80
File webFile;
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0; // index into HTTP_req buffer
void setup()
{
// disable Ethernet chip
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
Serial.begin(9600); // for debugging
// initialize SD card
Serial.println("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("ERROR - SD card initialization failed!");
return; // init failed
}
Serial.println("SUCCESS - SD card initialized.");
// check for index.htm file
if (!SD.exists("index.htm")) {
Serial.println("ERROR - Can't find index.htm file!");
return; // can't find index file
}
Serial.println("SUCCESS - Found index.htm file.");
Ethernet.begin(mac, ip); // initialize Ethernet device
server.begin(); // start to listen for clients
}
void loop()
{
EthernetClient client = server.available(); // try to get client
if (client) { // got client?
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) { // client data available to read
char c = client.read(); // read 1 byte (character) from client
// buffer first part of HTTP request in HTTP_req array (string)
// leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
if (req_index < (REQ_BUF_SZ - 1)) {
HTTP_req[req_index] = c; // save HTTP request character
req_index++;
}
// print HTTP request character to serial monitor
Serial.print(c);
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == '\n' && currentLineIsBlank) {
// open requested web page file
if (StrContains(HTTP_req, "GET / ")
|| StrContains(HTTP_req, "GET /index.htm")) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connnection: close");
client.println();
webFile = SD.open("index.htm"); // open web page file
}
else if (StrContains(HTTP_req, "GET /page2.htm")) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connnection: close");
client.println();
webFile = SD.open("page2.htm"); // open web page file
}
else if (StrContains(HTTP_req, "GET /pic.jpg")) {
webFile = SD.open("pic.jpg");
if (webFile) {
client.println("HTTP/1.1 200 OK");
client.println();
}
}
if (webFile) {
while(webFile.available()) {
client.write(webFile.read()); // send web page to client
}
webFile.close();
}
// reset buffer index and all buffer elements to 0
req_index = 0;
StrClear(HTTP_req, REQ_BUF_SZ);
break;
}
// every line of text received from the client ends with \r\n
if (c == '\n') {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != '\r') {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1); // give the web browser time to receive the data
client.stop(); // close the connection
} // end if (client)
}
// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
for (int i = 0; i < length; i++) {
str[i] = 0;
}
}
// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
char found = 0;
char index = 0;
char len;
len = strlen(str);
if (strlen(sfind) > len) {
return 0;
}
while (index < len) {
if (str[index] == sfind[found]) {
found++;
if (strlen(sfind) == found) {
return 1;
}
}
else {
found = 0;
}
index++;
}
return 0;
}
I am currently trying to upload an image from my SD card to a web server hosted by my WiFi shield.
This statement doesn't make sense. If the shield is being used, by the Arduino, to act as a server, there is no need to "upload an image to the server"..
Sorry. I think I wrote that wrong. I'm trying to insert a JPEG image into an HTML web page. I am using the SD card as a webserver but trying to upload an image to it.
Im using the code and instructions from this website but modifying it to work with a wifi shield and cannot get it to connect to the WIFI. That is my only problem.
Sorry. I think I wrote that wrong. I'm trying to insert a JPEG image into an HTML web page. I am using the SD card as a webserver but trying to upload an image to it.
I still think you are having trouble describing what you are trying to do. You don't insert JPEG images in HTML web pages. You insert links to them, using the img tag. This causes the browser to generate another GET request to request the linked-to file. Sending the image files in response to that request is little different from sending the html file in response to that request.
Ok so like the link I posted above I was able to put the webpages into the SD card and run the wifi shield as a webserver so that the contents of the SD card can be viewed wirelessly. This means that I can access the webserver wirelessly and see the image uploaded in to the SD card. The only problem is that the bigger the image file the slower it runs. I am trying to get it to run fast. What steps should I take? Should I try to shorten the code, try out a MEGA instead of an UNO, or does the problem entirely lie withing the capabilities of the WiFi Shield to transfer data?
NEW CODE
/*--------------------------------------------------------------
Program: eth_websrv_SD_image
Description: Arduino web server that serves up a basic web
page that displays an image.
Hardware: Arduino Uno and official Arduino Ethernet
shield. Should work with other Arduinos and
compatible Ethernet shields.
2Gb micro SD card formatted FAT16
Software: Developed using Arduino 1.0.5 software
Should be compatible with Arduino 1.0 +
Requires index.htm, page2.htm and pic.jpg to be
on the micro SD card in the Ethernet shield
micro SD card socket.
References: - WebServer example by David A. Mellis and
modified by Tom Igoe
- SD card examples by David A. Mellis and
Tom Igoe
- Ethernet library documentation:
http://arduino.cc/en/Reference/Ethernet
- SD Card library documentation:
http://arduino.cc/en/Reference/SD
Date: 7 March 2013
Modified: 17 June 2013
Author: W.A. Smith, http://startingelectronics.com
--------------------------------------------------------------*/
#include <SPI.h>
#include <WiFi.h>
#include <SD.h>
// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ 20
// MAC address from Ethernet shield sticker under board
//byte mac[6];
char ssid[] = "FIU_WiFi"; // your network SSID (name)
//char pass[] = "secretPassword"; // your network password
int keyIndex = 0;
WiFiServer server(80); // create a server at port 80
File webFile;
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0; // index into HTTP_req buffer
int status = WL_IDLE_STATUS;
void setup()
{
// disable Ethernet chip
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
Serial.begin(9600); // for debugging
// initialize SD card
Serial.println("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("ERROR - SD card initialization failed!");
return; // init failed
}
Serial.println("SUCCESS - SD card initialized.");
// check for index.htm file
if (!SD.exists("index.htm")) {
Serial.println("ERROR - Can't find index.htm file!");
return; // can't find index file
}
Serial.println("SUCCESS - Found index.htm file.");
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while(true);
}
// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid);
// wait 10 seconds for connection:
delay(6000);
}
server.begin();
//printWifiStatus();
printWifiStatus();
}
void loop()
{
WiFiClient client = server.available(); // try to get client
if (client) { // got client?
Serial.println("new client");
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) { // client data available to read
char c = client.read(); // read 1 byte (character) from client
// buffer first part of HTTP request in HTTP_req array (string)
// leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
if (req_index < (REQ_BUF_SZ - 1)) {
HTTP_req[req_index] = c; // save HTTP request character
req_index++;
}
// print HTTP request character to serial monitor
Serial.print(c);
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == '\n' && currentLineIsBlank) {
// open requested web page file
if (StrContains(HTTP_req, "GET / ")
|| StrContains(HTTP_req, "GET /index.htm")) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connnection: close");
client.println();
webFile = SD.open("index.htm"); // open web page file
}
else if (StrContains(HTTP_req, "GET /page2.htm")) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connnection: close");
client.println();
webFile = SD.open("page2.htm"); // open web page file
}
else if (StrContains(HTTP_req, "GET /pic.jpg")) {
webFile = SD.open("pic.jpg");
if (webFile) {
client.println("HTTP/1.1 200 OK");
client.println();
}
}
if (webFile) {
while(webFile.available()) {
client.write(webFile.read()); // send web page to client
}
webFile.close();
}
// reset buffer index and all buffer elements to 0
req_index = 0;
StrClear(HTTP_req, REQ_BUF_SZ);
break;
}
// every line of text received from the client ends with \r\n
if (c == '\n') {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != '\r') {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1); // give the web browser time to receive the data
client.stop(); // close the connection
} // end if (client)
}
// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
for (int i = 0; i < length; i++) {
str[i] = 0;
}
}
// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
char found = 0;
char index = 0;
char len;
len = strlen(str);
if (strlen(sfind) > len) {
return 0;
}
while (index < len) {
if (str[index] == sfind[found]) {
found++;
if (strlen(sfind) == found) {
return 1;
}
}
else {
found = 0;
}
index++;
}
return 0;
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
Test code that shows how to put many bytes into a data packet to speed up the upload speed from a standard Ethernet shield. You might adapt this for your wifi shield.
//zoomkat 12/26/12
//SD server test code
//open serial monitor to see what the arduino receives
//address will look like http://192.168.1.102:84 when submited
//for use with W5100 based ethernet shields
#include <SD.h>
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = {
192, 168, 1, 102 }; // ip in lan
byte gateway[] = {
192, 168, 1, 1 }; // internet access via router
byte subnet[] = {
255, 255, 255, 0 }; //subnet mask
EthernetServer server(84); //server port
String readString;
//////////////////////
void setup(){
Serial.begin(9600);
// disable w5100 while setting up SD
pinMode(10,OUTPUT);
digitalWrite(10,HIGH);
Serial.print("Starting SD..");
if(!SD.begin(4)) Serial.println("failed");
else Serial.println("ok");
Ethernet.begin(mac, ip, gateway, gateway, subnet);
//delay(2000);
server.begin();
Serial.println("Ready");
}
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') {
///////////////
Serial.println(readString); //print to serial monitor for debuging
client.println("HTTP/1.1 200 OK"); //send new page
//client.println("Content-Type: text/html");
client.println("Content-Type: image/jpeg");
//client.println("Content-Type: image/gif");
//client.println("Content-Type: application/x-javascript");
//client.println("Content-Type: text");
client.println();
//File myFile = SD.open("boom.htm");
File myFile = SD.open("HYPNO.JPG");
//File myFile = SD.open("BLUEH_SL.GIF");
//File myFile = SD.open("SERVOSLD.HTM");
if (myFile) {
byte clientBuf[64];
int clientCount = 0;
while(myFile.available())
{
clientBuf[clientCount] = myFile.read();
clientCount++;
if(clientCount > 63)
{
// Serial.println("Packet");
client.write(clientBuf,64);
clientCount = 0;
}
}
//final <64 byte cleanup packet
if(clientCount > 0) client.write(clientBuf,clientCount);
// close the file:
myFile.close();
}
delay(1);
//stopping client
client.stop();
readString="";
}
}
}
}
}
By changing your code into a code for the WiFi Shield all I get is a black screen for the web page with the IP address showing. I'll attach a picture of it to the message. This is the new code I used to try to get your code to work. i feel as thought I am missing something.
#include <SD.h>
#include <SPI.h>
#include <WiFi.h>
byte mac[6] ; //physical mac address
char ssid[] = "2WIRE814"; // your network SSID (name)
char pass[] = "xxxxxxxxx"; // your network password
int keyIndex = 1;
WiFiServer server(80); //server port
String readString;
//////////////////////
void setup(){
Serial.begin(9600);
// disable w5100 while setting up SD
pinMode(10,OUTPUT);
digitalWrite(10,HIGH);
Serial.print("Starting SD..");
if(!SD.begin(4)) Serial.println("failed");
else Serial.println("ok");
WiFi.begin(ssid, pass);
//delay(2000);
server.begin();
Serial.println("Ready");
}
void loop(){
// Create a client connection
WiFiClient 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') {
///////////////
Serial.println(readString); //print to serial monitor for debuging
client.println("HTTP/1.1 200 OK"); //send new page
//client.println("Content-Type: text/html");
client.println("Content-Type: image/jpeg");
//client.println("Content-Type: image/gif");
//client.println("Content-Type: application/x-javascript");
//client.println("Content-Type: text");
client.println();
//File myFile = SD.open("boom.htm");
File myFile = SD.open("pic.jpg");
//File myFile = SD.open("BLUEH_SL.GIF");
//File myFile = SD.open("SERVOSLD.HTM");
if (myFile) {
byte clientBuf[64];
int clientCount = 0;
while(myFile.available())
{
clientBuf[clientCount] = myFile.read();
clientCount++;
if(clientCount > 63)
{
// Serial.println("Packet");
client.write(clientBuf,64);
clientCount = 0;
}
}
//final <64 byte cleanup packet
if(clientCount > 0) client.write(clientBuf,clientCount);
// close the file:
myFile.close();
}
delay(1);
//stopping client
client.stop();
readString="";
}
}
}
}
}
Your indents are a bit confusing, but are you sure the file you are attempting to open exists? I see no error checking in your sketch. I would use this:
File myFile = SD.open("pic.jpg");
if (myFile) {
// your send stuff here
}
else {
Serial.println("File not opened");
}
