Untitled

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


#include <ESP8266WebServer.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
const long utcOffsetInSeconds = 3600;
const char* ssid       = "Nigeria";
const char* password   = "hondamsx125";
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", utcOffsetInSeconds);
ESP8266WebServer server(80);   //Web server object. Will be listening in port 80 (default for HTTP)

String strAlarmHour = "";
String strAlarmMinute = "";
bool AlarmON = false;
const int buttonPin = 3;
int LED = 16; // output D0
int displayMode = 0;
int buttonState;

void StartAlarm() {
AlarmON = true;
digitalWrite(LED, HIGH);
delay(1000);
digitalWrite(LED, LOW);
Serial.println("function startalarm started");
}

void indexhtml()  {
String noAlarmSet = "No alarm has been set";
strAlarmHour = server.arg("hour");
strAlarmMinute= server.arg("minute");
if (strAlarmHour == "") {
  String aHTML ="<!DOCTYPE html><html><body><h1>hello world</h1><form target=\"_self\" method=\"GET\">Hour:<br><input type=\"number\" name=\"hour\" min=\"0\" max=\"23\"><br>Minute:<br><input type=\"number\" name=\"minute\" min=\"0\" max=\"59\"<br><br><input type=\"submit\" value=\"Submit\"></form>";
  String bHTML ="</body></html>";
  String preHTML = aHTML + noAlarmSet + bHTML;
  const char *html = preHTML.c_str();
  server.send(200, "text/html", html);
}else {
  String aHTML ="<!DOCTYPE html><html><body><h1>hello world</h1><form target=\"_self\" method=\"GET\">Hour:<br><input type=\"number\" name=\"hour\" min=\"0\" max=\"23\"><br>Minute:<br><input type=\"number\" name=\"minute\" min=\"0\" max=\"59\"<br><br><input type=\"submit\" value=\"Submit\"></form>";
  String bHTML ="</body></html>";
  String preHTML = aHTML + strAlarmHour + ":" + strAlarmMinute + bHTML;
  const char *html = preHTML.c_str();
  server.send(200, "text/html", html);
}
}


void setup() {

Serial.begin(9600);
pinMode(buttonPin, INPUT);
pinMode(LED, OUTPUT); // Sets LED pin(D0) as a output
digitalWrite(LED, LOW); // Sets LED OFF
WiFi.begin(ssid, password); //Connect to the WiFi network

while (WiFi.status() != WL_CONNECTED) { //Wait for connection

delay(500);
Serial.println("Waiting to connect…");

}

Serial.print("IP address: ");
Serial.println(WiFi.localIP());  //Print the local IP to access the server
server.on("/", indexhtml);

server.begin();                                       //Start the server
Serial.println("Server listening");
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
  Serial.println(F("SSD1306 allocation failed"));
  for(;;);
}
}


void loop() {
timeClient.update();
int currentHours = (timeClient.getHours());
int currentMinutes = (timeClient.getMinutes());
int currentSeconds = (timeClient.getSeconds());
int alarmHour = strAlarmHour.toInt();
int alarmMinute = strAlarmMinute.toInt();
int alarmSecond = 0;

int totalCurrentSeconds = currentHours*3600 + currentMinutes*60 + currentSeconds;

int totalAlarmSeconds = alarmHour*3600 + alarmMinute*60 + alarmSecond;

int totalRemainingSeconds = totalAlarmSeconds - totalCurrentSeconds;

int remainingSeconds = totalRemainingSeconds % 60;

int remainingMinutes = totalRemainingSeconds / 60;
remainingMinutes = remainingMinutes%60;

int remainingHours = totalRemainingSeconds / 3600;

if (remainingHours < 0 && remainingMinutes < 0 && remainingSeconds < 0) {
  remainingHours = remainingHours + 24;
  remainingMinutes = remainingMinutes + 60;
  remainingSeconds = remainingSeconds + 60;
}

buttonState = digitalRead(buttonPin);
if (buttonState == LOW) {
  displayMode++;
  delay(500);
}

if (currentHours == alarmHour && currentMinutes  == alarmMinute)  {
  if (!AlarmON) {
  StartAlarm();
  }
}else
{
  AlarmON = false;
}

display.setTextColor(WHITE);
display.setCursor(10, 0);
display.clearDisplay();
if (displayMode == 0) {
  display.setTextSize(1);
  display.println("Current time:");
  display.setTextSize(2);
  display.print(currentHours);
  display.print(":");
  display.print(currentMinutes);
  display.print(":");
  display.println(currentSeconds);
}else if (displayMode == 1) {
  display.setTextSize(1);
  display.println("Remaining time:");
  display.setTextSize(2);
  display.print(remainingHours);
  display.print(":");
  display.print(remainingMinutes);
  display.print(":");
  display.println(remainingSeconds);
}else {
  displayMode = 0;
}
display.display();

/*
display.setTextColor(WHITE);
display.setCursor(10, 0);
display.clearDisplay();
display.setTextSize(1);
display.println("Time:");
display.setTextSize(2);
display.println(currentHours);
display.print(":");
display.print(currentMinutes);
display.print(":");
display.println(currentSeconds);
display.display();
*/

server.handleClient();    //Handling of incoming requests

}