| joopie |
11/18/2013 04:14 PM |
here is the arduino code... i have added a blocked=) to areas that i thought may compromise security of my fish tank. there are still plenty of ideas i'd like to add/fix, but here is what i have so far.
PHP Code:
#include <OneWire.h>
#include <DallasTemperature.h>
#include <SPI.h>
#include <Ethernet.h>
#include <HttpClient.h>
#include <Time.h>
#include <EthernetUdp.h>
#include <NewPing.h>
//PINS
#define PIN_TEMP 3 //Temp Probes 01,02,03+
#define PIN_RY_HEATER 22 //Relay for heater
#define PIN_RY_FAN_LEFT 24 //Relay for left fan
#define PIN_RY_FAN_RIGHT 26 //Relay for right fan
#define PIN_RY_LEVEL 28 //level relay
#define PIN_RY_DRAIN 30 //drain relay
#define PIN_RY_AUX 32 //aux relay
#define PIN_LED_WHITE 9 //LED_WHITE
#define PIN_LED_BLUE 8 //LED_BLUE
#define TRIGGER_PIN 11
#define ECHO_PIN 10
#define MAX_DISTANCE 200
#define amt 30
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
const int chipSelect = 4;
byte mac[] = {
0xDA, 0xAD, 0xBF, 0xEF, 0xFE, 0xED };
byte ip[] = {
192,168,1,120};
OneWire oneWire(PIN_TEMP);
DallasTemperature sensors(&oneWire);
DeviceAddress Probe01 = {
0x28, 0x48, 0xA1, 0x5C, 0x04, 0x00, 0x00, 0x60 };
DeviceAddress Probe02 = {
0x28, 0xB3, 0x6B, 0x5C, 0x04, 0x00, 0x00, 0x75 };
DeviceAddress Probe03 = {
0x28, 0xF3, 0x14, 0x98, 0x04, 0x00, 0x00, 0x35 };
DeviceAddress Probe04 = {
0x28, 0x30, 0xE8, 0x1D, 0x05, 0x00, 0x00, 0x87 };
DeviceAddress Probe05 = {
0x28, 0x8E, 0xB2, 0xEF, 0x04, 0x00, 0x00, 0x66 };
DeviceAddress Probe06 = {
0x28, 0xAA, 0x1D, 0xEF, 0x04, 0x00, 0x00, 0x50 };
DeviceAddress Probe07 = {
0x28, 0x6D, 0x64, 0xEF, 0x04, 0x00, 0x00, 0xD4 };
//Time
IPAddress timeServer(132, 163, 4, 101); // time-a.timefreq.bldrdoc.gov
const int timeZone = -4;
EthernetUDP Udp;
unsigned int localPort = blocked=);
unsigned long CUR_MILLIS;
//String webServer = "blocked=)";
EthernetClient client;
//Alarms
boolean ALARM_LEVEL_HIGH = false;
boolean ALARM_LEVEL_LOW = false;
boolean ALARM_PH_HIGH = false;
boolean ALARM_PH_LOW = false;
boolean ALARM_TEMP_AVG_HIGH = false;
boolean ALARM_TEMP_AVG_LOW = false;
//Input Vars
float IN_TEMP_HEATER; //probe 1
float IN_TEMP_RETURN; //probe 2
float IN_TEMP_OVERFLOW; //probe 3
float IN_TEMP_ROOM; //probe 4
float IN_TEMP_TANK; //probe 7
float IN_LED_TEMP_LEFT; //probe 5
float IN_LED_TEMP_RIGHT; //probe 6
float IN_LED_BLUE = 5;
float IN_LED_WHITE = 5;
float IN_LEVEL_SUMP; //Sump water level
float IN_LEVEL_PH;
float TEMP_AVG;
int IN_HEATER_MODE = 2; // 0 - OFF, 1 - ON, 2 - AUTO
int IN_LED_FAN_MODE = 2; // 0 - OFF, 1 - ON, 2 - AUTO
int IN_LED_MODE = 2; // 0 - OFF, 1 - ON, 2 - AUTO
int IN_LEVEL_MODE = 2; //0 - OFF, 1 - ON, 2 - AUTO
int IN_AUX_MODE = 0; //0 - OFF, 1 - ON
int IN_LEVEL_DRAIN_MODE = 0; //0 - OFF, 1 - ON
int IN_LEVEL_PH_MODE = 1; //0 - STOP, 1 - CON,2-TEMP, 3 - CAL4, 4 - CAL7, 5 - CAL10, ...
int IN_LEVEL_PH_MODE_L = 0;
//OUTPUT Vars
boolean OUT_HEATER = false;
boolean OUT_LEFT_FAN = false;
boolean OUT_RIGHT_FAN = false;
boolean OUT_LEVEL = false;
//boolean OUT_LEVEL_DRAIN = false;
int OUT_LED_WHITE;
int OUT_LED_BLUE;
float OUT_LEVEL_SUMP;
//Setpoints
float SP_TEMP_RETURN = 77.80;
float SPR_TEMP_RETURN = 78.20;
float SP_TEMP_LED = 85.00;
float SPR_TEMP_LED = 80.00;
float SP_LEVEL = 11.00;
float SPR_LEVEL = 12.00;
//Ranges in minutes
int LED_WHITE_START = 720;
int LED_WHITE_END = 1200;
int LED_BLUE_START = 600;
int LED_BLUE_END = 1320;
int LED_MID = 960;
//led ranges
int BLUE_UP = 150;
int BLUE_LW = 19;
int WHITE_UP = 200;
int WHITE_LW = 19;
//sump ranges
float SUMP_RNG = 24;
String readString;
//frame delays
long PREV_MILLIS = 0;
long PREV_MILLIS1 = 0;
long PREV_MILLIS2 = 0;
long IN_DELAY = 1000; // 500ms framerate
long XMIT_DELAY = 5000; // 3s framerate
long REC_DELAY = 10000; // 10s framerate
boolean keep;
//ph stuff
#define avgSize 20
float phavg[avgSize];
int phRear=0;
float LVLavg[avgSize];
int LVLRear=0;
void QueueEnter(float queue[],float item,int *rear){
if(*rear < avgSize)
{
queue[*rear]=item;
*rear++;
}else{
*rear = 0;
}
}
float getAVG(float queue[]){
float avg;
int count = 0;
for(int i = 0;i < avgSize;i++){
if(queue[i] != 0){
avg += queue[i];
count++;
}
}
return avg / count;
}
void setup()
{
Serial.begin(38400);
Serial.println("Initializing...");
Serial.print("PH Probe... ");
Serial.println(startPH());
Serial.print("Temperature Sensors... ");
Serial.println(startTemp());
Serial.print("Ethernet... ");
Serial.println(startEthernet());
Serial.print("Input/Outputs... ");
Serial.println(startPins());
Serial.print("Time Server... ");
Serial.print(startTime());
Serial.print(" ");
Serial.println(getTime());
Serial.print("Setting up Relays... ");
Serial.println(startPins());
Config("Password",blocked=));
Config("Heater_Mode",IN_HEATER_MODE);
Config("LED_Mode",IN_LED_MODE);
Config("LED_Fan_Mode",IN_LED_FAN_MODE);
Config("Level_Mode",IN_LEVEL_MODE);
Config("Level_PH_Mode",IN_LEVEL_PH_MODE);
Config("Level_Drain_Mode",IN_LEVEL_DRAIN_MODE);
Config("AUX_Mode",IN_AUX_MODE);
}
void loop()
{
CUR_MILLIS = millis();
if (CUR_MILLIS - PREV_MILLIS > IN_DELAY){
PREV_MILLIS = CUR_MILLIS;
Inputs();
Process();
Outputs();
}
if (CUR_MILLIS - PREV_MILLIS1 > XMIT_DELAY){
PREV_MILLIS1 = CUR_MILLIS;
XMIT();
}
if (CUR_MILLIS - PREV_MILLIS2 > REC_DELAY){
PREV_MILLIS2 = CUR_MILLIS;
RX();
}
}
String getTime()
{
String theTime;
theTime.concat(month());
theTime.concat("/");
theTime.concat(day());
theTime.concat("/");
theTime.concat(year());
theTime.concat(" ");
theTime.concat(hour() - 1);
theTime.concat(":");
theTime.concat(minute());
theTime.concat(":");
theTime.concat(second());
return theTime;
}
void XMIT(){
Trender("TEMP_RETURN",IN_TEMP_RETURN);
Trender("TEMP_HEATER",IN_TEMP_HEATER);
Trender("TEMP_OVERFLOW",IN_TEMP_OVERFLOW);
Trender("TEMP_TANK",IN_TEMP_TANK);
Trender("TEMP_ROOM",IN_TEMP_ROOM);
Trender("TEMP_AOUT_HEATER",OUT_HEATER?1.0f:0.0f);
Trender("LED_ABLUE",map(OUT_LED_BLUE,BLUE_LW,BLUE_UP,0,100)); //grab in var to output in %
Trender("LED_AWHITE",map(OUT_LED_WHITE,WHITE_LW,WHITE_UP,0,100)); //grab in var to output in %
Trender("LED_XTEMP_LEFT",IN_LED_TEMP_LEFT);
Trender("LED_XTEMP_RIGHT",IN_LED_TEMP_RIGHT);
Trender("LED_FAN_LEFT",OUT_LEFT_FAN);
Trender("LED_FAN_RIGHT",OUT_RIGHT_FAN);
Trender("LEVEL_SUMP",IN_LEVEL_SUMP);
Trender("LEVEL_FILL",OUT_LEVEL);
Trender("LEVEL_XPH",IN_LEVEL_PH);
Trender("LEVEL_DRAIN",IN_LEVEL_DRAIN_MODE);
//Trender("LEVEL_AUX_MODE",IN_AUX_MODE);
Trender("ALARM_LEVEL_HIGH",ALARM_LEVEL_HIGH);
Trender("ALARM_LEVEL_LOW",ALARM_LEVEL_LOW);
Trender("ALARM_PH_HIGH",ALARM_PH_HIGH);
Trender("ALARM_PH_LOW",ALARM_PH_LOW);
Trender("ALARM_TEMP_AVG_HIGH",ALARM_TEMP_AVG_HIGH);
Trender("ALARM_TEMP_AVG_LOW",ALARM_TEMP_AVG_LOW);
}
void Trender(String table,float value){
if (client.connect("blocked=)", blocked=)))
{
client.print("GET /blocked=)");
client.print(table);
client.print("&value=");
client.println(value);
}
client.flush();
client.stop();
client.flush();
}
void RX(){
if (client.connect("blocked=)",blocked=)))
{
client.println("GET /blocked=)");
client.println();
}
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();
if (c == '!') {
client.stop();
}
readString += c;
}
}
parseString(readString);
readString = "";
}
client.flush();
client.stop();
client.flush();
}
void parseString(String str){
keep = true;
int offset = 0;
while(keep){
int start = str.indexOf('#',offset) + 1;
int mid = str.indexOf('@',offset);
int finish = str.indexOf('$',offset);
int endloop = str.indexOf('!');
offset = finish + 1;
String name = str.substring(start,mid);
float value = strTofloat(str.length(),str.substring(mid + 1,finish));
setInput(name,value);
if(offset == endloop){
str = "";
keep = false;
}
}
}
void setInput(String name,float value){
if(name == "Heater_Mode"){
IN_HEATER_MODE = (int)(value);
}
else if(name == "LED_Mode"){
IN_LED_MODE = (int)(value);
}
else if(name == "LED_Fan_Mode"){
IN_LED_FAN_MODE = (int)(value);
}
else if(name == "LED_Blue"){
IN_LED_BLUE = (int)(value);
}
else if(name == "LED_White"){
IN_LED_WHITE = (int)(value);
}
else if(name == "Password"){
}
else if(name == "Level_Mode"){
IN_LEVEL_MODE = (int)(value);
}
else if(name == "Level_PH_Mode"){
IN_LEVEL_PH_MODE = (int)(value);
}
else if(name == "Level_Drain_Mode"){
IN_LEVEL_DRAIN_MODE = (int)(value);
}
else if(name == "AUX_Mode"){
IN_AUX_MODE = (int)(value);
}
else{
Serial.println("INVALID ARGS PASSED TO SETINPUT");
keep = false;
}
}
void Config(String setting,float value){
if (client.connect("blocked=)",blocked=)))
{
client.print("GET /blocked=)");
client.print(setting);
client.print("&value=");
client.println(value);
}
client.flush();
client.stop();
client.flush();
}
boolean startTime()
{
Udp.begin(localPort);
setSyncProvider(getNtpTime);
return true;
}
boolean startPH(){
Serial3.begin(38400);
delay(2000);
return true;
}
boolean startPins()
{
pinMode(PIN_RY_HEATER,OUTPUT);
digitalWrite(PIN_RY_HEATER,HIGH); //off
pinMode(PIN_RY_FAN_LEFT,OUTPUT);
digitalWrite(PIN_RY_FAN_LEFT,HIGH); //off
pinMode(PIN_RY_FAN_RIGHT,OUTPUT);
digitalWrite(PIN_RY_FAN_RIGHT,HIGH); //off
pinMode(PIN_RY_LEVEL,OUTPUT);
digitalWrite(PIN_RY_LEVEL,HIGH); //off
pinMode(PIN_LED_WHITE,OUTPUT);
pinMode(PIN_LED_BLUE,OUTPUT);
pinMode(PIN_RY_DRAIN,OUTPUT);
digitalWrite(PIN_RY_DRAIN,HIGH); //off
pinMode(PIN_RY_AUX,OUTPUT);
digitalWrite(PIN_RY_AUX,HIGH); //off
return true;
}
boolean startTemp()
{
sensors.begin();
sensors.setResolution(Probe01, 12);
sensors.setResolution(Probe02, 12);
sensors.setResolution(Probe03, 12);
sensors.setResolution(Probe04, 12);
sensors.setResolution(Probe05, 12);//left led
sensors.setResolution(Probe06, 12);//right led
sensors.setResolution(Probe07, 12);//tank
if (sensors.getDeviceCount() > 0){
return sensors.getDeviceCount();
}
else{
return false;
}
}
boolean startEthernet(){
Ethernet.begin(mac,ip);
server.begin();
return true;
}
void Alarms(){
if(IN_LEVEL_SUMP > 15){
ALARM_LEVEL_HIGH = true;
}else{
ALARM_LEVEL_HIGH = false;
}
if(IN_LEVEL_SUMP < 8){
ALARM_LEVEL_LOW = true;
}else{
ALARM_LEVEL_LOW = false;
}
if(IN_LEVEL_PH > 9){
ALARM_PH_HIGH = true;
}else{
ALARM_PH_HIGH = false;
}
if(IN_LEVEL_PH < 7.6){
ALARM_PH_LOW = true;
}else{
ALARM_PH_LOW = false;
}
if(TEMP_AVG > 82){
ALARM_TEMP_AVG_HIGH = true;
}else{
ALARM_TEMP_AVG_HIGH = false;
}
if(TEMP_AVG < 76){
ALARM_TEMP_AVG_LOW = true;
}else{
ALARM_TEMP_AVG_LOW = false;
}
}
void Inputs()
{
sensors.requestTemperatures();
IN_TEMP_HEATER = getTemp(IN_TEMP_HEATER,Probe01);
IN_TEMP_RETURN = getTemp(IN_TEMP_RETURN,Probe02);
IN_TEMP_OVERFLOW = getTemp(IN_TEMP_OVERFLOW,Probe03);
IN_TEMP_ROOM = getTemp(IN_TEMP_ROOM,Probe04);
IN_LED_TEMP_LEFT = getTemp(IN_LED_TEMP_LEFT,Probe05);
IN_LED_TEMP_RIGHT = getTemp(IN_LED_TEMP_RIGHT,Probe06);
IN_TEMP_TANK = getTemp(IN_TEMP_TANK,Probe07);
IN_LEVEL_SUMP = readLevel();
IN_LEVEL_PH = PHProcess(IN_LEVEL_PH_MODE);
}
void Process()
{
OUT_HEATER = Controller(IN_TEMP_RETURN,SP_TEMP_RETURN,SPR_TEMP_RETURN,true,IN_HEATER_MODE,OUT_HEATER); //Heater controller
OUT_LEFT_FAN = Controller(IN_LED_TEMP_LEFT,SP_TEMP_LED,SPR_TEMP_LED,false,IN_LED_FAN_MODE,OUT_LEFT_FAN); //Left LED Fan
OUT_RIGHT_FAN = Controller(IN_LED_TEMP_RIGHT,SP_TEMP_LED,SPR_TEMP_LED,false,IN_LED_FAN_MODE,OUT_RIGHT_FAN); //Right LED Fan
OUT_LED_WHITE = LEDController(map(IN_LED_WHITE,0,100,WHITE_LW,WHITE_UP),IN_LED_MODE,"white"); // white led controller
OUT_LED_BLUE = LEDController(map(IN_LED_BLUE,0,100,BLUE_LW,BLUE_UP),IN_LED_MODE,"blue"); //blue led controller
OUT_LEVEL = Controller(IN_LEVEL_SUMP,SP_LEVEL,SPR_LEVEL,true,IN_LEVEL_MODE,OUT_LEVEL); //Heater controller
TEMP_AVG = (IN_TEMP_RETURN + IN_TEMP_OVERFLOW + IN_TEMP_TANK) / 3;
Alarms();
}
float PHProcess(int mode){ //0 - STOP, 1 - CON,2-TEMP, 3 - CAL4, 4 - CAL7, 5 - CAL10, 6 - CALD4,7 - CALD7,8 - CALD10
if(mode != IN_LEVEL_PH_MODE_L){
switch(mode){
case 0:
Serial3.print("E\r\r");
delay(1000);
break;
case 1:
Serial3.print("C\r\r");
delay(1000);
break;
case 2:
Serial3.print(toC(IN_TEMP_RETURN));
Serial3.print("\r\r");
delay(1000);
break;
case 3: //ph 4
Serial3.print("F\r\r");
Config("LEVEL_PH_MODE",6);
break;
case 4: //ph 7
Serial3.print("S\r\r");
Config("LEVEL_PH_MODE",7);
break;
case 5: //ph 10
Serial3.print("T\r\r");
Config("LEVEL_PH_MODE",8);
break;
}
}
IN_LEVEL_PH_MODE_L = mode;
return readPH();
}
int LEDController(int IN_LED,int mode,String color){
if (mode == 0){ //Off
return 0;
}
else if(mode == 1){ //On
return IN_LED;
}
else{ //auto
int minNow = ((hour() - 1) * 60) + minute();
if(minNow <= LED_BLUE_START){ //0-10
return 0;
}
else if(minNow >= LED_BLUE_END){//22-24
return 0;
}
else if(minNow >= LED_BLUE_START && minNow <= LED_WHITE_START && color == "blue"){ //10-12 blue only
return map(minNow,LED_BLUE_START,LED_WHITE_START,BLUE_LW,BLUE_UP);
}
else if(minNow >= LED_BLUE_START && minNow <= LED_WHITE_START && color == "white"){ //10-12 white
return 0;
}
else if(minNow >= LED_WHITE_START && minNow <= LED_MID && color == "blue"){ //12-16 blue
return map(minNow,LED_WHITE_START,LED_MID,BLUE_UP,BLUE_LW);
}
else if(minNow >= LED_WHITE_START && minNow <= LED_MID && color == "white"){ //12-16 white
return map(minNow,LED_WHITE_START,LED_MID,WHITE_LW,WHITE_UP);
}
else if(minNow >= LED_MID && minNow <= LED_WHITE_END && color == "blue"){ //16-20 blue
return map(minNow,LED_MID,LED_WHITE_END,BLUE_LW,BLUE_UP);
}
else if(minNow >= LED_MID && minNow <= LED_WHITE_END && color == "white"){ //16-29 white
return map(minNow,LED_MID,LED_WHITE_END,WHITE_UP,WHITE_LW);
}
else if(minNow >= LED_WHITE_END && minNow <= LED_BLUE_END && color == "blue"){ // 20-22 blue
return map(minNow,LED_WHITE_END,LED_BLUE_END,BLUE_UP,BLUE_LW);
}
else if(minNow >= LED_WHITE_END && minNow <= LED_BLUE_END && color == "white"){ // 20-22 blue
return 0;
}
else{
return 0;
}
}
}
boolean Controller(float input,float sp,float rst,boolean dec,int mode,boolean output){
if (mode == 0){ //Off
return false;
}
else if(mode == 1){ //On
return true;
}
else{ //Auto
if(dec){
if(input < sp){
return true;
}
else if(input > rst){
return false;
}
else{
return output;
}
}
else{
if(input > sp){
return true;
}
else if(input < rst){
return false;
}
else{
return output;
}
}
}
}
void Outputs(){
digitalWrite(PIN_RY_HEATER,!OUT_HEATER); //Invert output for relay
digitalWrite(PIN_RY_FAN_LEFT,!OUT_LEFT_FAN);
digitalWrite(PIN_RY_FAN_RIGHT,!OUT_RIGHT_FAN);
digitalWrite(PIN_RY_LEVEL,!OUT_LEVEL);
digitalWrite(PIN_RY_DRAIN,!IN_LEVEL_DRAIN_MODE);
digitalWrite(PIN_RY_AUX,!IN_AUX_MODE);
analogWrite(PIN_LED_WHITE,OUT_LED_WHITE);
analogWrite(PIN_LED_BLUE,OUT_LED_BLUE);
}
float getTemp(float last,DeviceAddress deviceAddress)
{
float temp = sensors.getTempF(deviceAddress);
if(temp < 0){
return last;
}
else{
return temp;
}
}
float readLevel(){
float average;
float samples[amt];
for (int i=0; i< amt; i++) {
float uS = sonar.ping();
float dist = uS / US_ROUNDTRIP_IN;
samples[i] = dist;
delay(30);
}
average = 0;
for (int i=0; i< amt; i++) {
average += samples[i];
}
average /= amt;
QueueEnter(LVLavg,SUMP_RNG - average,&LVLRear);
return getAVG(LVLavg);
}
float lastPH;
float readPH(){
String PHSTR = "";
while(Serial3.available()){
char inchar = (char)Serial3.read();
PHSTR += inchar;
if(inchar == '\r') {
float phCheck = strTofloat(PHSTR.length(),PHSTR);
if(phCheck > 14 || phCheck < 0){
return lastPH;
}
else{
float phCorrected;
if(phCheck >= 7){
phCorrected = mapfloat(phCheck,7.00,10.20,7.00,10.00);
}
else{
phCorrected = mapfloat(phCheck,3.70,7.00,4.00,6.99);
}
lastPH = phCorrected;
QueueEnter(phavg,phCorrected,&phRear);
Serial.println("");
Serial.println(phCorrected);
Serial.println(getAVG(phavg));
return getAVG(phavg);
}
}
}
}
float mapfloat(float x, float in_min, float in_max, float out_min, float out_max)
{
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
float strTofloat(int chars,String str){
char floatbuf[chars];
str.toCharArray(floatbuf,sizeof(floatbuf));
float value = atof(floatbuf);
}
float toC(float temp){
return (temp - 32) * (5/9);
}
/*-------- NTP code ----------*/
const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message
byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming & outgoing packets
time_t getNtpTime()
{
while (Udp.parsePacket() > 0) ; // discard any previously received packets
// Serial.println("Transmit NTP Request");
sendNTPpacket(timeServer);
uint32_t beginWait = millis();
while (millis() - beginWait < 1500) {
int size = Udp.parsePacket();
if (size >= NTP_PACKET_SIZE) {
// Serial.println("Receive NTP Response");
Udp.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer
unsigned long secsSince1900;
// convert four bytes starting at location 40 to a long integer
secsSince1900 = (unsigned long)packetBuffer[40] << 24;
secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
secsSince1900 |= (unsigned long)packetBuffer[43];
return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR;
}
}
Serial.println("No NTP Response :-(");
return 0; // return 0 if unable to get the time
}
// send an NTP request to the time server at the given address
void 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 clock
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); //NTP requests are to port 123
Udp.write(packetBuffer, NTP_PACKET_SIZE);
Udp.endPacket();
}
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