/*
 * A Simple clock using the Nokia 5110 Screen and the esp8266 NodeMCU
 * The pins of the display are connected to D1 - D5 (GPIO 14,2 0,4 and 5 
 * CLK, DIN, D/C, CS, RST respectively)
 */

#include <ESP8266WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include <Adafruit_PCD8544.h>  // include adafruit PCD8544 (Nokia 5110) library
int currentHour;   //Hour Variable
int currentMinute; //Minute Variable
int currentSecond; //Second Variable
const char *ssid  = "********";// Replace with your network credentials
const char *password = "********";


// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "0.uk.pool.ntp.org");   // This is the UK time server i used

 
// Nokia 5110 LCD module connections CLK, DIN, D/C, CS, RST (opposite to the actual pin positions !!)
Adafruit_PCD8544 display = Adafruit_PCD8544(14, 2, 0, 4, 5);
 

void setup()   {
 
  display.begin();

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    }
  timeClient.begin();
  timeClient.setTimeOffset(3600); //Add 1 hour (in seconds) to get BST

  display.setContrast(60);
  display.clearDisplay();   // clears the screen and buffer

} 
 
void loop() {
  
  timeClient.update();  
  currentHour = timeClient.getHours(); 
  currentMinute = timeClient.getMinutes();
  currentSecond = timeClient.getSeconds();
  


  display.setTextColor(BLACK);
  display.setTextSize(2);
  display.setCursor(0,14);
  if (currentHour <= 9) { //If Hour is single figures, put a 0 in front
    display.print("0");
  }
  display.print(currentHour);
  display.print(":");
  if (currentMinute <= 9) {  //If Minute is single figures, put a 0 in front
    display.print("0");
  }
  display.print(currentMinute);
  display.print(":");
  display.setTextSize(1); 
    if (currentSecond <= 9) {  //If Seconds is single figures, put a 0 in front
    display.print("0");
  } 
  display.print(currentSecond);
  display.display();  // Everything is written to a buffer.. so now display on screen
 
  /*
   * To clear the screen, i just wrote the same thing to the buffer in white
   * otherwise the second display would be jumbled with the previous etc
   */
  
  display.setTextColor(WHITE);
  display.setTextSize(2);
  display.setCursor(0,14);
    if (currentHour <= 9) {
    display.print("0");
  }
  display.print(currentHour);
  display.print(":");
  if (currentMinute <= 9) {
    display.print("0");
  }
  display.print(currentMinute);
  display.print(":");
  display.setTextSize(1);
  if (currentSecond <= 9) {
    display.print("0");
  } 
  display.print(currentSecond);
 
// No need to display the screen again
}