Hi,
I’m creating a web output from a Mega 2560 for senzors value and sd card content and I use the code belllow that I found on a site. The strange problem is that the output of the file names is not a string, but a number like for instance as in the bellow output. Whay doesn’t print correctly the filenames?
SD Card Files:
73667795767912649.698869
86796865707912649.698869
667979846988.767971
83698286736773/
6873837549/
Arduino sketch is this:
/*
Web Server
A simple web server that shows the value of the analog input pins.
using an Arduino Wiznet Ethernet shield.
created 18 Dec 2009
by David A. Mellis
modified 4 Sep 2010
by Tom Igoe
*/
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,100, 199);
// Initialize the Ethernet server library with the IP address and port you want to use (port 80 is default for HTTP):
EthernetServer server(80);
// include the SD library:
#include <SD.h>
// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;
// change this to match your SD shield or module, Arduino Ethernet shield: pin 4
const int chipSelect = 4;
void setup()
{
Serial.begin(9600);
Ethernet.begin(mac, ip); // start the Ethernet connection and the server:
server.begin();
}
#define BUFSIZ 100
void loop()
{
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
// 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();
// output the value of each analog input pin
client.print("<html><head><title>test page</title><meta http-equiv='refresh' content='5'></head><body><b>page title</b><hr />
<table border=1><tr><td><b>SENZOR</b></td><td><b>TYPE</b></td><td><b>PIN</b></td><td><b>VALUE</b></td></tr>");
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
if (analogChannel == 0) {
client.print("<tr><td>LIGHT</td><td>A</td><td>"); //example of senzor
client.print(analogChannel);
client.print("</td><td>");
client.print(analogRead(analogChannel));
client.print("</td></tr>");
}
else{
client.print("<tr><td>N/A</td><td>A</td><td>");
client.print(analogChannel);
client.print("</td><td>");
client.print(analogRead(analogChannel));
client.print("</td></tr>");
}
}
for (int digitalChannel = 0; digitalChannel < 54; digitalChannel++) {
client.print("<tr><td>N/A</td><td>D</td><td>");
client.print(digitalChannel);
client.print("</td><td>");
client.print(digitalRead(digitalChannel));
client.print("</td></tr>");
}
client.print("</table></body><hr />");
//Start SD Card files explorer section
client.println("<h2>SD Card Files:</h2>");
// print all the files on the SD Card
pinMode(53, OUTPUT); // change this to 53 on a mega
// we'll use the initialization code from the utility libraries since we're just testing if the card is working!
if (!card.init(SPI_HALF_SPEED, chipSelect)) {
Serial.println("initialization failed. Things to check:* card is inserted? * wiring correct?did you change the chipSelect pin to match shield/module?");
return;
} else {
Serial.println("SD Card is present.");
}
if (!volume.init(card)) {
Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
return;
}
root.openRoot(volume); //access the root of the SD card volume
// list all files in the card with date and size
root.ls(LS_R | LS_DATE | LS_SIZE); //for serial box output
dir_t p;
root.rewind();
client.println("<ul>");
while (root.readDir(p) > 0) {
// done if past last used entry
if (p.name[0] == DIR_NAME_FREE) break;
// skip deleted entry and entries for . and ..
if (p.name[0] == DIR_NAME_DELETED || p.name[0] == '.') continue;
// only list subdirectories and files
if (!DIR_IS_FILE_OR_SUBDIR(&p)) continue;
// print any indent spaces
client.print("<li><a href=\"");
for (uint8_t i = 0; i < 11; i++) {
if (p.name[i] == ' ') continue;
if (i == 8) {
client.print('.');
}
client.print(p.name[i]);
}
client.print("\">");
// print file name with possible blank fill
for (uint8_t i = 0; i < 11; i++) {
if (p.name[i] == ' ') continue;
if (i == 8) {
client.print('.');
}
client.print(p.name[i]);
}
client.print("</a>");
if (DIR_IS_SUBDIR(&p)) {
client.print('/');
}
// print modify date/time if requested
if (0 & LS_DATE) {
root.printFatDate(p.lastWriteDate);
client.print(' ');
root.printFatTime(p.lastWriteTime);
}
// print size if requested
if (!DIR_IS_SUBDIR(&p) && (0 & LS_SIZE)) {
client.print(' ');
client.print(p.fileSize);
}
client.println("</li>");
}
client.println("</ul>");
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();
}
}
