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#include <EtherCard.h>
#define RELAY_PIN 2
#define SECONDS_IN_DAY 86400
#define START_YEAR 1900
#define TIME_ZONE +8
static int days_in_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
static byte ntpServer[] = {193,204,114,232};
static byte srcPort = 0;
unsigned long lastTime =0;
uint32_t timeStamp;
boolean requestSent;
unsigned int day,month,year,hour, minute,second;
#define INTERVAL 1000
static byte mymac[] = {0xDD,0xDD,0xDD,0x00,0x00,0x01};
static byte myip[] = {192,168,1,2};
byte Ethernet::buffer[700];
char* on = "ON";
char* off = "OFF";
boolean relayStatus;
char* relayLabel;
char* linkLabel;
void setup () {
Serial.begin(57600);
Serial.println("WebRelay Demo");
if(!ether.begin(sizeof Ethernet::buffer, mymac, 10))
Serial.println( "Failed to access Ethernet controller");
else
Serial.println("Ethernet controller initialized");
if (!ether.dhcpSetup())
Serial.println("DHCP failed");
else
Serial.println("DHCP configuration done");
ether.printIp("My IP: ", ether.myip);
// ether.printIp("Netmask: ", ether.mymask);
ether.printIp("GW IP: ", ether.gwip);
ether.printIp("DNS IP: ", ether.dnsip);
pinMode(RELAY_PIN, OUTPUT);
digitalWrite(RELAY_PIN, LOW);
relayStatus = false;
relayLabel = off;
linkLabel = on;
requestSent = false;
}
void loop() {
word len = ether.packetReceive();
word pos = ether.packetLoop(len);
if(pos) {
if(strstr((char *)Ethernet::buffer + pos, "GET /?ON") != 0) {
relayStatus = true;
relayLabel = on;
linkLabel = off;
} else if(strstr((char *)Ethernet::buffer + pos, "GET /?OFF") != 0) {
relayStatus = false;
relayLabel = off;
linkLabel = on;
}
digitalWrite(RELAY_PIN, relayStatus);
BufferFiller bfill = ether.tcpOffset();
bfill.emit_p(PSTR("HTTP/1.0 200 OK\r\n"
"Content-Type: text/html\r\nPragma: no-cache\r\n\r\n"
"<html><head><meta name='viewport' content='width=200px'/></head><body>"
"<div style='position:absolute;width:200px;height:200px;top:50%;left:50%;margin:-100px 0 0 -100px'>"
"<div style='font:bold 14px verdana;text-align:center'>Relay is $S</div>"
"<br><div style='text-align:center'>"
"<a href='/?$S'><img src='http://www.lucadentella.it/files/bt_$S.png'></a>"
"<br><a href='\'>$D/$D/$D</a><br>"
"<a href='\'>Time:$D:$D:$D</a>"
"</div></div></body></html>"
), relayLabel, linkLabel, linkLabel,day,month,year,hour,minute,second);
ether.httpServerReply(bfill.position());
}
distime();
}
void distime()
{
if(requestSent && ether.ntpProcessAnswer(&timeStamp, srcPort)) {
Serial.println("NTP answer received");
Serial.print("Timestamp: ");
Serial.println(timeStamp);
printDate(timeStamp + 3600 * TIME_ZONE+100);
requestSent = false;
}
unsigned long time = millis();
if(time - lastTime > INTERVAL) {
lastTime = time;
ether.ntpRequest(ntpServer, srcPort);
Serial.println("NTP request sent");
requestSent = true;
}
}
void printDate(uint32_t timeStamp) {
year = START_YEAR;
while(1) {
uint32_t seconds;
if(isLeapYear(year)) seconds = SECONDS_IN_DAY * 366;
else seconds = SECONDS_IN_DAY * 365;
if(timeStamp >= seconds) {
timeStamp -= seconds;
year++;
} else break;
}
month = 0;
while(1) {
uint32_t seconds = SECONDS_IN_DAY * days_in_month[month];
if(isLeapYear(year) && month == 1) seconds = SECONDS_IN_DAY * 29;
if(timeStamp >= seconds) {
timeStamp -= seconds;
month++;
} else break;
}
month++;
day = 1;
while(1) {
if(timeStamp >= SECONDS_IN_DAY) {
timeStamp -= SECONDS_IN_DAY;
day++;
} else break;
}
hour = timeStamp / 3600;
minute = (timeStamp - (uint32_t)hour * 3600) / 60;
second = (timeStamp - (uint32_t)hour * 3600) - minute * 60;
Serial.println("Current date and time:");
if(day < 10) Serial.print("0");
Serial.print(day);
Serial.print("/");
if(month < 10) Serial.print("0");
Serial.print(month);
Serial.print("/");
Serial.println(year);
if(hour < 10) Serial.print("0");
Serial.print(hour);
Serial.print(":");
if(minute < 10) Serial.print("0");
Serial.print(minute);
Serial.print(":");
if(second < 10) Serial.print("0");
Serial.println(second);
}
boolean isLeapYear(unsigned int year) {
return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
}
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