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Code.ino
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Code.ino
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/*
PCD8544 Library Modified for Esp32 Nokia 5110 LCD Interfacing.
Sample code for Displaying time and Date from NTP servers.
https://github.com/Anirudhvl/Esp32-Nokia-5110-Interfacing-and-NTP-Sync-IST-Digital-Clock
*/
#include <WiFi.h>
#include "PCD8544.h"
#include "driver/gpio.h"
#include <TimeLib.h>
#include <WiFiUdp.h>
const char* ssid = "PICSimLabWifi";
const char* password = "";
static PCD8544 lcd = PCD8544(14, 13, 27, 26, 15); //sclk, sdin, dc, reset, sce
static const char ntpServerName[] = "time.nist.gov";
const int timeZone = 0;// 0 is UTC, use -3 for Brasil
WiFiUDP Udp;
unsigned int localPort = 8888;
time_t getNtpTime();
void setup() {
gpio_set_direction( GPIO_NUM_23, GPIO_MODE_OUTPUT);
gpio_set_level( GPIO_NUM_23, 1);
lcd.begin(84, 48);
lcd.clear();
lcd.setCursor(1, 0);
lcd.print("WiFi Begin... ");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
lcd.clear();
lcd.setCursor(1, 0);
lcd.print("Connecting... ");
delay(200);
}
lcd.clear();
lcd.setCursor(1, 0);
lcd.print("Connected to WiFi ");
delay(200);
Udp.begin(localPort);
setSyncProvider(getNtpTime);
setSyncInterval(300);
lcd.clear();
lcd.setCursor(1, 0);
lcd.print("Waiting for Time Sync.. ");
delay(500);
Udp.begin(localPort);
}
time_t prevDisplay = 0;
void loop() {
if (timeStatus() != timeNotSet) {
if (now() != prevDisplay) { //update the display only if time has changed
prevDisplay = now();
digitalClockDisplay();
}
}
}
void digitalClockDisplay()
{
lcd.clear();
lcd.setCursor(18, 0);
lcd.print("ESP32 NTP");
// digital clock display of the time
lcd.setCursor(20, 2);
lcd.print(hour());
printDigits(minute());
printDigits(second());
lcd.setCursor(20, 4);
lcd.print(day());
lcd.print("/");
lcd.print(month());
lcd.print("/");
lcd.print(year());
}
void printDigits(int digits)
{
// utility for digital clock display: prints preceding colon and leading 0
lcd.print(":");
if (digits < 10)
lcd.print('0');
lcd.print(digits);
}
/*-------- 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()
{
IPAddress ntpServerIP; // NTP server's ip address
while (Udp.parsePacket() > 0) ; // discard any previously received packets
// get a random server from the pool
WiFi.hostByName(ntpServerName, ntpServerIP);
Serial.print(ntpServerName);
Serial.print(": ");
Serial.println(ntpServerIP);
sendNTPpacket(ntpServerIP);
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;
}
}
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();
}