Requirements
1. Arduino Mega2560 R3
2. W5100 Ethernet Shield
3. RTC Sensor Shield (designed to stack on Arduino Uno cannot stack on Mega2560)
4. LM35 Temperature Sensor Breakout connect to RTC Sensor Shield A3
Connection
Sketch
/*
* NTPSynchronizedRTCAnalogDataLoggerWithFileDownloadServer.ino
*
* This sketch calls alarm functions at 7:30 am and at 7:30 pm (19:30)
* and sync DS1307, Arduino system time
*
* At startup the system time read from DS1307, then both sync with NTP
*
* Modified by Befun Hung on Oct. 11, 2013 based on NTPSyncronizedAnalogDataLogger.ino
* by adding web interface file download server function,
* so that files can be downloaded from the remote site the data logger installed
*/
#include <Wire.h>
#include <Time.h>
#include <DS1307RTC.h>
#include <TimeAlarms.h>
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
#include <SD.h>
#define analogSensorStart 3 // sensor connect to A3
#define analogSensorEnd 3 // sensor connect to A3
// Enter a MAC address for your controller bellow.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
byte ip[] = {192, 168, 1, 177};
unsigned int localPort = 8888; // local port to listen for UDP packets
IPAddress timeServer(140, 112, 2, 188); // ntp2.ntu.edu.tw NTP server
const int NTP_PACKET_SIZE = 48; // NTP time stamp is in the first 48 bytes of the message
byte packetBuffer[NTP_PACKET_SIZE]; // buffer to hold incoming and outgoing packets
// A UDP instance to let us send and receive packets over UDP
EthernetUDP Udp;
// timeZoneOffset = (Time Zone) * 3600L eg. (+8) * 3600L = 28800L for Taipei, Taiwan
const long timeZoneOffset = 28800L;
// sync to NTP server every "ntpSyncTime" seconds, set to 1 hour or more to be reasonable
unsigned long ntpSyncTime = 21600;
// adjust the sync latency with computer NTP client in seconds
unsigned int syncLatency = 2;
// sd card variables
File file; // test file
const uint8_t SD_CS = 4; // SD chip select
String file_name = ""; // file name should not prefix with "prefix_word"
char fn[] = "MMDDHHMM.CSV";
int i=0;
int displayAtSecond = 0;
time_t t;
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
// for list files
File root;
File webFile;
//------------------------------------------------------------------------------
// call back for file timestamps
void dateTime(uint16_t* date, uint16_t* time) {
time_t timeStamp = now();
// return date using FAT_DATE macro to format fields
*date = FAT_DATE(year(timeStamp), month(timeStamp), day(timeStamp));
// return time using FAT_TIME macro to format fields
*time = FAT_TIME(hour(timeStamp), minute(timeStamp), second(timeStamp));
}
//------------------------------------------------------------------------------
void setup()
{
Serial.begin(9600);
Wire.begin();
setSyncProvider(RTC.get); // the function to get the time from the RTC
if (timeStatus() != timeSet)
Serial.println("Unable to sync with the RTC");
else
Serial.println("RTC has set the system time");
// set date time callback function
SdFile::dateTimeCallback(dateTime);
// display RTC time
Serial.print(year());
Serial.print('-');
Serial.print(month());
Serial.print('-');
Serial.print(day());
Serial.print(' ');
Serial.print(hour());
Serial.print(':');
Serial.print(minute());
Serial.print(':');
Serial.print(second());
Serial.println(" --- RTC Time");
// create the alarms
Alarm.alarmRepeat(7,30,0, ntpSyncDS1307); // 7:30am every day
Alarm.alarmRepeat(19,30,0, ntpSyncDS1307); // 7:30pm every day
// start Ethernet and UDP
Ethernet.begin(mac, ip);
Udp.begin(localPort);
ntpSyncDS1307();
// process file name string
t = now();
if (month(t) < 10) {
file_name = String(file_name + '0' + String(month(t), DEC));
}
else {
file_name = String(file_name +String(month(t), DEC));
}
if (day(t) < 10) {
file_name = String(file_name + '0' + String(day(t), DEC));
}
else {
file_name = String(file_name +String(day(t), DEC));
}
if (hour(t) < 10) {
file_name = String(file_name + '0' + String(hour(t), DEC));
}
else {
file_name = String(file_name +String(hour(t), DEC));
}
if (minute(t) < 10) {
file_name = String(file_name + '0' + String(minute(t), DEC));
}
else {
file_name = String(file_name +String(minute(t), DEC));
}
file_name = String(file_name + ".CSV");
for (i=0;i<=file_name.length();i++) {
fn[i] = file_name.charAt(i);
}
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
if (!SD.begin(SD_CS)) {
Serial.println("SD failed");
// while(1);
}
// start the web server:
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
root = SD.open("/");
}
void loop(){
webServer();
t = now();
if (displayAtSecond != second(t)) {
analogSensorDataLogger();
displayAtSecond = second(t);
}
Alarm.delay(100); // wait 1/10 second between cycles
}
// functions to be called when an alarm triggers:
void ntpSyncDS1307() {
sendNTPpacket(timeServer); // send an NTP packet to a time server
// wait to see if a replay is available
delay(1000);
if (Udp.parsePacket()) {
// We've received a packet, read the data from it
Udp.read(packetBuffer, NTP_PACKET_SIZE); // read the packet into the buffer
// the timstamp starts at byte 40 of the received packet and is four bytes,
// or two words, long. First, extract the two words:
unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
// combine the four bytes (two words) into a long integer
// this is NTP time (seconds since Jan 1 1900)
unsigned long secsSince1900 = highWord << 16 | lowWord;
// now convert NTP time into everyday time:
// Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
const unsigned long seventyYears = 2208988800L;
// substract seventy years:
unsigned long epoch = secsSince1900 - seventyYears + timeZoneOffset + syncLatency;
setTime(epoch);
RTC.set(epoch);
// output time and "Sync OK" message every sync
Serial.print(year());
Serial.print('-');
Serial.print(month());
Serial.print('-');
Serial.print(day());
Serial.print(' ');
Serial.print(hour());
Serial.print(':');
Serial.print(minute());
Serial.print(':');
Serial.print(second());
Serial.print(' ');
Serial.println("Sync OK");
}
}
// send an NTP request to the time server at the given address
unsigned long sendNTPpacket(IPAddress& address) {
// set all bytes in the buffer to 0
memset(packetBuffer, 0, NTP_PACKET_SIZE);
// Initialize values needed to form NTP request
// (see URL above for details on the packets)
packetBuffer[0] = 0b11100011; // LI, Version, Mode
packetBuffer[1] = 0; // Stratum, or type of clodk
packetBuffer[2] = 6; // Polling Interval
packetBuffer[3] = 0xEC; // Peer Clock Precision
// 8 bytes of zero for Root Delay & Root Dispersion
packetBuffer[12] = 49;
packetBuffer[13] = 0x4E;
packetBuffer[14] = 49;
packetBuffer[15] = 52;
// all NTP fields have been given values, now
// you can send a packet requesting a timestamp:
Udp.beginPacket(address, 123);
Udp.write(packetBuffer, NTP_PACKET_SIZE);
Udp.endPacket();
}
void analogSensorDataLogger() {
String data_string = "";
data_string = String(year(t), DEC);
data_string += "/";
if (month(t) < 10) {
data_string = String(data_string + '0' + String(month(t), DEC));
}
else {
data_string = String(data_string +String(month(t), DEC));
}
data_string += "/";
if (day(t) < 10) {
data_string = String(data_string + '0' + String(day(t), DEC));
}
else {
data_string = String(data_string +String(day(t), DEC));
}
data_string += " ";
if (hour(t) < 10) {
data_string = String(data_string + '0' + String(hour(t), DEC));
}
else {
data_string = String(data_string +String(hour(t), DEC));
}
data_string += ":";
if (minute(t) < 10) {
data_string = String(data_string + '0' + String(minute(t), DEC));
}
else {
data_string = String(data_string +String(minute(t), DEC));
}
data_string += ":";
if (second(t) < 10) {
data_string = String(data_string + '0' + String(second(t), DEC));
}
else {
data_string = String(data_string +String(second(t), DEC));
}
data_string += ",";
//read sensor value from A0-A3 and append to the string
for (int analogPin = analogSensorStart; analogPin <= analogSensorEnd; analogPin++)
{
int sensor = analogRead(analogPin);
data_string += String(sensor);
if (analogPin < analogSensorEnd) {
data_string += ",";
}
}
file = SD.open(fn, FILE_WRITE);
if (file) {
file.println(data_string);
file.close();
Serial.println(data_string);
}
else {
Serial.print("error opening ");
Serial.println(fn);
}
}
#define BUFSIZ 100
void webServer()
{
char clientline[BUFSIZ];
int index = 0;
EthernetClient client = server.available();
if (client) {
// an http request ends with a blank line
boolean current_line_is_blank = true;
// reset the input buffer
index = 0;
while (client.connected()) {
if (client.available()) {
char c = client.read();
// If it isn't a new line, add the character to the buffer
if (c != '\n' && c != '\r') {
clientline[index] = c;
index++;
// are we too big for the buffer? start tossing out data
if (index >= BUFSIZ)
index = BUFSIZ -1;
// continue to read more data!
continue;
}
// got a \n or \r new line, which means the string is done
clientline[index] = 0;
// Print it out for debugging
Serial.print("clientline: ");
Serial.println(clientline);
// Look for substring such as a request to get the root file
if (strstr(clientline, "GET / ") != 0) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
// print all the files, use a helper to keep it clean
client.println("<h2>Files:</h2>");
int numTabs;
root.rewindDirectory();
while (true) {
File entry = root.openNextFile();
if (! entry) {
// no more files
client.println("** no more files **");
client.println("<br />");
break;
}
client.print("<a href=\"");
client.print(entry.name());
client.print("\">");
client.print(entry.name());
client.print("</a>");
client.print(" ");
client.print(entry.size(), DEC);
client.print("<br />");
entry.close();
}
} else if (strstr(clientline, "GET /") != 0) {
// this time no space after the /, so a sub-file!
char *filename;
filename = clientline + 5; // look after the "GET /" (5 chars)
// a little trick, look for the " HTTP/1.1" string and
// turn the first character of the substring into a 0 to clear it out.
(strstr(clientline, " HTTP"))[0] = 0;
// print the file we want
Serial.print("filename: ");
Serial.print(filename);
Serial.println(" Opened!");
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/plain");
client.println();
webFile = SD.open(filename);
if (webFile) {
while (webFile.available()) {
client.write(webFile.read());
}
webFile.close();
}
} else {
// everything else is a 404
client.println("HTTP/1.1 404 Not Found");
client.println("Content-Type: text/html");
client.println();
client.println("<h2>File Not Found!</h2>");
}
break;
}
}
// give the web browser time to receive the data
delay(1);
client.stop();
}
}
