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Arduino MEGA 48 Output
/*--------------------------------------------------------------
Program: ethernet_webserver_SD_Ajax_48_out
Description: Arduino web server allows 48 outputs to be
switched on and off using checkboxes.
The web page is stored on the micro SD card.
Hardware: Arduino MEGA 2560 and official Arduino Ethernet
shield.
Tested with 24 LEDs connected from pin 2 to 49
Can't use pins 50 to 53 when Ethernet shield
plugged in, these pins are for SPI.
2Gb micro SD card formatted FAT16.
Software: Developed using Arduino 1.0.6 software
Should be compatible with Arduino 1.0 +
SD card contains web page called index.htm
References: - SD card examples by Rahul
- Ethernet library documentation:
http://arduino.cc/en/Reference/Ethernet
- SD Card library documentation:
http://arduino.cc/en/Reference/SD
- Based on code from the Ethernet shield
tutorial:
http://www.yawot.com/
Date: 30 March 2015
Author: Rahul , http://www.yawot.com/
--------------------------------------------------------------*/
#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>
// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ 60
// 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; // the web page file on the SD card
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0; // index into HTTP_req buffer
unsigned char LED_state[3] = {0}; // stores the states of the LEDs, 1 bit per LED
void setup()
{
int i;
// 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.");
// pins 26 to 49 are outputs
for (i = 2; i <= 49; i++) {
pinMode(i, OUTPUT); // set pins as outputs
digitalWrite(i, LOW); // switch the output pins off
}
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
// limit the size of the stored received HTTP request
// 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++;
}
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
// remainder of header follows below, depending on if
// web page or XML page is requested
// Ajax request - send XML file
if (StrContains(HTTP_req, "ajax_inputs")) {
// send rest of HTTP header
client.println("Content-Type: text/xml");
client.println("Connection: keep-alive");
client.println();
SetLEDs();
// send XML file containing input states
XML_response(client);
}
else { // web page request
// send rest of HTTP header
client.println("Content-Type: text/html");
client.println("Connection: keep-alive");
client.println();
// send web page
webFile = SD.open("index.htm"); // open web page file
if (webFile) {
while(webFile.available()) {
client.write(webFile.read()); // send web page to client
}
webFile.close();
}
}
// display received HTTP request on serial port
//Serial.print(HTTP_req);
// 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)
}
// checks if received HTTP request is switching on/off LEDs
// also saves the state of the LEDs
void SetLEDs(void)
{
char str_on[12] = {0};
char str_off[12] = {0};
unsigned char i;
unsigned int j;
int LED_num = 1;
for (i = 0; i < 3; i++) {
for (j = 1; j <= 0x80; j <<= 1) {
sprintf(str_on, "LED%d=%d", LED_num, 1);
sprintf(str_off, "LED%d=%d", LED_num, 0);
if (StrContains(HTTP_req, str_on)) {
LED_state[i] |= (unsigned char)j; // save LED state
digitalWrite(LED_num + 25, HIGH);
Serial.println("ON");
}
else if (StrContains(HTTP_req, str_off)) {
LED_state[i] &= (unsigned char)(~j); // save LED state
digitalWrite(LED_num + 25, LOW);
}
LED_num++;
}
}
}
// send the XML file with analog values, switch status
// and LED status
void XML_response(EthernetClient cl)
{
unsigned char i;
unsigned int j;
cl.print("<?xml version = \"1.0\" ?>");
cl.print("<inputs>");
for (i = 0; i < 3; i++) {
for (j = 1; j <= 0x80; j <<= 1) {
cl.print("<LED>");
if ((unsigned char)LED_state[i] & j) {
cl.print("checked");
//Serial.println("ON");
}
else {
cl.print("unchecked");
}
cl.println("</LED>");
}
}
cl.print("</inputs>");
}
// 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;
}webserver code that you can copy and save into your sd card on the ethernet shield
<!DOCTYPE html>
<html>
<head>
<title>Arduino MEGA 48 Output by yawot.com</title>
<script>
strLED = "";
function GetArduinoIO()
{
nocache = "&nocache=" + Math.random() * 1000000;
var request = new XMLHttpRequest();
request.onreadystatechange = function()
{
if (this.readyState == 4) {
if (this.status == 200) {
if (this.responseXML != null) {
// XML file received - contains LED states
var re;
var num_LEDs;
var i;
var ledstr = "";
re = this.responseXML.getElementsByTagName('LED');
num_LEDs = re.length;
for (i = 0; i < num_LEDs; i++) {
ledstr = "LED" + (i + 1);
if (re[i].childNodes[0].nodeValue === "checked") {
document.getElementsByName(ledstr)[0].checked = true;
}
else {
document.getElementsByName(ledstr)[0].checked = false;
}
}
}
}
}
}
// send HTTP GET request with LEDs to switch on/off if any
request.open("GET", "ajax_inputs" + strLED + nocache, true);
request.send(null);
setTimeout('GetArduinoIO()', 1000);
strLED = "";
}
// service LEDs when checkbox checked/unchecked
function GetCheck(led_num_str, cb)
{
if (cb.checked) {
strLED += ("&" + led_num_str + "=1");
}
else {
strLED += ("&" + led_num_str + "=0");
}
}
</script>
<style>
.out_box {
float: left;
margin: 0 20px 20px 0;
border: 1px solid red;
padding: 0 5px 0 5px;
min-width: 280px;
}
input {
margin: 10px;
}
input {
vertical-align: -3px;
}
h1 {
font-size: 120%;
color: red;
margin: 0 0 10px 0;
}
h2 {
font-size: 85%;
color: #5734E6;
margin: 5px 0 5px 0;
}
p, form, button {
font-size: 80%;
color: #red;
}
.small_text {
font-size: 70%;
color: #797373;
}
</style>
</head>
<body onload="GetArduinoIO()">
<h1>Arduino MEGA 48 Output by yawot.com</h1>
<div class="out_box">
<form class="check_LEDs" name="LED_form1">
<input type="checkbox" name="LED1" value="0" onclick="GetCheck('LED1', this)" />LED 1 (D22)
<input type="checkbox" name="LED2" value="0" onclick="GetCheck('LED2', this)" />LED 2 (D23)<br />
<input type="checkbox" name="LED3" value="0" onclick="GetCheck('LED3', this)" />LED 3 (D24)
<input type="checkbox" name="LED4" value="0" onclick="GetCheck('LED4', this)" />LED 4 (D25)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form1">
<input type="checkbox" name="LED1" value="0" onclick="GetCheck('LED1', this)" />LED 5 (D26)
<input type="checkbox" name="LED2" value="0" onclick="GetCheck('LED2', this)" />LED 6 (D27)<br />
<input type="checkbox" name="LED3" value="0" onclick="GetCheck('LED3', this)" />LED 7 (D28)
<input type="checkbox" name="LED4" value="0" onclick="GetCheck('LED4', this)" />LED 8 (D29)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form2">
<input type="checkbox" name="LED5" value="0" onclick="GetCheck('LED5', this)" />LED 9 (D30)
<input type="checkbox" name="LED6" value="0" onclick="GetCheck('LED6', this)" />LED 10 (D31)<br />
<input type="checkbox" name="LED7" value="0" onclick="GetCheck('LED7', this)" />LED 11 (D32)
<input type="checkbox" name="LED8" value="0" onclick="GetCheck('LED8', this)" />LED 12 (D33)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form3">
<input type="checkbox" name="LED9" value="0" onclick="GetCheck('LED9', this)" />LED 13 (D34)
<input type="checkbox" name="LED10" value="0" onclick="GetCheck('LED10', this)" />LED 14 (D35)<br />
<input type="checkbox" name="LED11" value="0" onclick="GetCheck('LED11', this)" />LED 15 (D36)
<input type="checkbox" name="LED12" value="0" onclick="GetCheck('LED12', this)" />LED 16 (D37)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form4">
<input type="checkbox" name="LED13" value="0" onclick="GetCheck('LED13', this)" />LED 17 (D38)
<input type="checkbox" name="LED14" value="0" onclick="GetCheck('LED14', this)" />LED 18 (D39)<br />
<input type="checkbox" name="LED15" value="0" onclick="GetCheck('LED15', this)" />LED 19 (D40)
<input type="checkbox" name="LED16" value="0" onclick="GetCheck('LED16', this)" />LED 20 (D41)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form5">
<input type="checkbox" name="LED17" value="0" onclick="GetCheck('LED17', this)" />LED 21 (D42)
<input type="checkbox" name="LED18" value="0" onclick="GetCheck('LED18', this)" />LED 22 (D43)<br />
<input type="checkbox" name="LED19" value="0" onclick="GetCheck('LED19', this)" />LED 23 (D44)
<input type="checkbox" name="LED20" value="0" onclick="GetCheck('LED20', this)" />LED 24 (D45)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form6">
<input type="checkbox" name="LED21" value="0" onclick="GetCheck('LED21', this)" />LED 25 (D46)
<input type="checkbox" name="LED22" value="0" onclick="GetCheck('LED22', this)" />LED 26 (D47)<br />
<input type="checkbox" name="LED23" value="0" onclick="GetCheck('LED23', this)" />LED 27 (D48)
<input type="checkbox" name="LED24" value="0" onclick="GetCheck('LED24', this)" />LED 28 (D49)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form1">
<input type="checkbox" name="LED1" value="0" onclick="GetCheck('LED1', this)" />LED 29 (D14)
<input type="checkbox" name="LED2" value="0" onclick="GetCheck('LED2', this)" />LED 30 (D15)<br />
<input type="checkbox" name="LED3" value="0" onclick="GetCheck('LED3', this)" />LED 31 (D16)
<input type="checkbox" name="LED4" value="0" onclick="GetCheck('LED4', this)" />LED 32 (D17)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form1">
<input type="checkbox" name="LED1" value="0" onclick="GetCheck('LED1', this)" />LED 33 (D18)
<input type="checkbox" name="LED2" value="0" onclick="GetCheck('LED2', this)" />LED 34 (D19)<br />
<input type="checkbox" name="LED3" value="0" onclick="GetCheck('LED3', this)" />LED 35 (D20)
<input type="checkbox" name="LED4" value="0" onclick="GetCheck('LED4', this)" />LED 36 (D21)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form1">
<input type="checkbox" name="LED1" value="0" onclick="GetCheck('LED1', this)" />LED 37 (D2)
<input type="checkbox" name="LED2" value="0" onclick="GetCheck('LED2', this)" />LED 38 (D3)<br />
<input type="checkbox" name="LED3" value="0" onclick="GetCheck('LED3', this)" />LED 39 (D4)
<input type="checkbox" name="LED4" value="0" onclick="GetCheck('LED4', this)" />LED 40 (D5)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form1">
<input type="checkbox" name="LED1" value="0" onclick="GetCheck('LED1', this)" />LED 41 (D6)
<input type="checkbox" name="LED2" value="0" onclick="GetCheck('LED2', this)" />LED 42 (D7)<br />
<input type="checkbox" name="LED3" value="0" onclick="GetCheck('LED3', this)" />LED 43 (D8)
<input type="checkbox" name="LED4" value="0" onclick="GetCheck('LED4', this)" />LED 44 (D9)
</form>
</div>
<div class="out_box">
<form class="check_LEDs" name="LED_form1">
<input type="checkbox" name="LED1" value="0" onclick="GetCheck('LED1', this)" />LED 45 (D10)
<input type="checkbox" name="LED2" value="0" onclick="GetCheck('LED2', this)" />LED 46 (D11)<br />
<input type="checkbox" name="LED3" value="0" onclick="GetCheck('LED3', this)" />LED 47 (D12)
<input type="checkbox" name="LED4" value="0" onclick="GetCheck('LED4', this)" />LED 48 (D13)
</form>
</div>
</form>
</div>
</body>
</html>
246900cookie-checkArduino MEGA 48 Output Control using the web page
