#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);                                             // set the LCD address to 0x27 for a 16 chars and 2 line display
int GreenledPin = 13;                                                         // choose the pin for the LED
int RedledPin = 12;                                                           // choose the pin for the LED
int input4Pin = 6;                                                            //push buttons are connected to 6
int input3Pin = 5;                                                            // 5
int input2Pin = 4;                                                            // 4  
int input1Pin = 3;                                                            //3 of arduino uno
int buzzer= 11;                                                               //buzzer is connected to pin 11 of arduino uno 

int i;                                                                         // integer i is to store the values 

#include <Adafruit_Fingerprint.h>


#if (defined(AVR) || defined(ESP8266)) && !defined(AVR_ATmega2560)

SoftwareSerial mySerial(A1,A0);

#else
// On Leonardo/M0/etc, others with hardware serial, use hardware serial!
// #0 is green wire, #1 is white
#define mySerial Serial1

#endif


Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);


void setup()
{lcd.init();                                                              //initialize the lcd 
 // Print a message to the LCD.
lcd.setCursor(2,0);                                                      //Set cursor to character 2 on line 0

lcd.backlight();
lcd.print("welcome to"); lcd.setCursor(2,1);                             //Move cursor to character 2 on line 1
lcd.print(" voting");
  Serial.begin(9600);
  
pinMode(buzzer, OUTPUT); 
  pinMode(2, OUTPUT); 
  pinMode(GreenledPin, OUTPUT);                                     // declare LED as output
  pinMode(RedledPin, OUTPUT);                                       // declare LED as output
  pinMode(input4Pin, INPUT);                                        // declare push button inputs
  pinMode(input3Pin, INPUT);
  pinMode(input2Pin, INPUT);
  pinMode(input1Pin, INPUT);

while (!Serial);                                                    // For Yun/Leo/Micro/Zero/...
  delay(100);
  Serial.println("\n\nAdafruit finger detect test");                // set the data rate for the sensor serial port
  
  finger.begin(57600);
  delay(5);
  if (finger.verifyPassword()) {
    
    Serial.println("Found fingerprint sensor!");
  } else {
    
    Serial.println("Did not find fingerprint sensor :(");
    while (1) { delay(1); }
  }

  Serial.println(F("Reading sensor parameters"));
  finger.getParameters();
  Serial.print(F("Status: 0x")); Serial.println(finger.status_reg, HEX);
  Serial.print(F("Sys ID: 0x")); Serial.println(finger.system_id, HEX);
  Serial.print(F("Capacity: ")); Serial.println(finger.capacity);
  Serial.print(F("Security level: ")); Serial.println(finger.security_level);
  Serial.print(F("Device address: ")); Serial.println(finger.device_addr, HEX);
  Serial.print(F("Packet len: ")); Serial.println(finger.packet_len);
  Serial.print(F("Baud rate: ")); Serial.println(finger.baud_rate);

  finger.getTemplateCount();

  if (finger.templateCount == 0) {
    Serial.print("Sensor doesn't contain any fingerprint data. Please run the 'enroll' example.");
  }
  else {
    Serial.println("Waiting for valid finger...");
      Serial.print("Sensor contains "); Serial.print(finger.templateCount); Serial.println(" templates");
  }
}

  
 

void loop()
{ 
 while (getFingerprintID())
        
  {
  for( i=3 ; i<=6 ; i++)
    checkPush (i);
  }

}

void checkPush(int pinNumber)
{
  int pushed = digitalRead(pinNumber);                                    // read input value
  if (pushed ==HIGH)                                                      // check if the input is HIGH (button released)
   {
    digitalWrite(GreenledPin, HIGH);                                      //turn LED ON
    digitalWrite(RedledPin, HIGH);                                        //turn LED ON
    Serial.print(pinNumber);
    Serial.println(pinNumber);
   

   if( i==3  )
  {
     lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("A");
  }


if( i==4  )
  {
     lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("B");
  }


if( i==5  )
  { 
    lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("C");
  }


if( i==6  )
  {
    lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("D");
   } 
  delay(1000);
  lcd.clear();
  digitalWrite(2,HIGH);
   }
  else
    digitalWrite(GreenledPin , LOW);                        //  turn LED OFF
    digitalWrite(RedledPin, LOW);                           //  turn LED OFF
  
}

uint8_t getFingerprintID() {
  uint8_t p = finger.getImage();
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image taken");
      break;
    case FINGERPRINT_NOFINGER:
      Serial.println("No finger detected");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    case FINGERPRINT_IMAGEFAIL:
      Serial.println("Imaging error");
      return p;
    default:
      Serial.println("Unknown error");
      return p;
  }

  // OK success!

  p = finger.image2Tz();
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image converted");
      break;
    case FINGERPRINT_IMAGEMESS:
      Serial.println("Image too messy");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    case FINGERPRINT_FEATUREFAIL:
      Serial.println("Could not find fingerprint features");
      return p;
    case FINGERPRINT_INVALIDIMAGE:
      Serial.println("Could not find fingerprint features");
      return p;
    default:
      Serial.println("Unknown error");
      return p;
  }

  // OK converted!
  p = finger.fingerSearch();
  if (p == FINGERPRINT_OK) {
    Serial.println("Found a print match!");
    lcd.clear();
    lcd.setCursor(2,0);
    lcd.print("Found a print match!");
  } else if (p == FINGERPRINT_PACKETRECIEVEERR) {
    Serial.println("Communication error");
    return p;
  } else if (p == FINGERPRINT_NOTFOUND) {
    Serial.println("Did not find a match");
     lcd.clear();
    lcd.setCursor(2,0);
    lcd.print("Did not find");
    lcd.setCursor(2,1);
    lcd.print(" a match");
    tone(11,200);
    delay(500);
    noTone(11);
    delay(500);
    return p;
  } else {
    Serial.println("Unknown error");
    return p;
  }

  // found a match!
  Serial.print("Found ID #"); Serial.print(finger.fingerID);
  Serial.print(" with confidence of "); Serial.println(finger.confidence);

  return finger.fingerID;
}


// returns -1 if failed, otherwise returns ID #
int getFingerprintIDez() {
  uint8_t p = finger.getImage();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger.image2Tz();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger.fingerFastSearch();
  if (p != FINGERPRINT_OK)  return -1;
  

  // found a match!
  Serial.print("Found ID #"); Serial.print(finger.fingerID);
  Serial.print(" with confidence of "); Serial.println(finger.confidence);
  return finger.fingerID;
}