/3// Include required libraries
#include <MFRC522.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <Servo.h>
#include <SPI.h>
// Create instances
LiquidCrystal_I2C lcd(0x27, 16, 2);
MFRC522 mfrc522(10, 9); // MFRC522 mfrc522(SS_PIN, RST_PIN)
Servo sg180;
// Initialize Pins for led's, servo and buzzer
// Blue LED is connected to 5V
constexpr uint8_t greenLed = 7;
constexpr uint8_t redLed = 6;
constexpr uint8_t servoPin = 8;
constexpr uint8_t buzzerPin = 5;
char initial_password[4] = {'1', '2', '3', '4'}; // Variable to store initial password
String tagUID = "B3 05 F6 16"; // String to store UID of tag. Change it with your tag's UID
char password[4]; // Variable to store users password
boolean RFIDMode = true; // boolean to change modes
char key_pressed = 0; // Variable to store incoming keys
uint8_t i = 0; // Variable used for counter
// defining how many rows and columns our keypad have
const byte rows = 4;
const byte columns = 4;
// Keypad pin map
char hexaKeys[rows][columns] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
// Initializing pins for keypad
byte row_pins[rows] = {A0, A1, A2, A3};
byte column_pins[columns] = {2, 1, 0};
// Create instance for keypad
Keypad keypad_key = Keypad( makeKeymap(hexaKeys), row_pins, column_pins, rows, columns);
void setup() {
// Arduino Pin configuration
pinMode(buzzerPin, OUTPUT);
pinMode(redLed, OUTPUT);
pinMode(greenLed, OUTPUT);
sg180.attach(servoPin); //Declare pin 8 for servo
sg180.write(0); // Set initial position at 90 degrees
lcd.init(); // LCD screen
lcd.backlight();
SPI.begin(); // Init SPI bus
mfrc522.PCD_Init(); // Init MFRC522
lcd.clear(); // Clear LCD screen
}
void loop() {
// System will first look for mode
if (RFIDMode == true) {
lcd.setCursor(0, 0);
lcd.print("Jacksons Vending");
lcd.setCursor(0, 1);
lcd.print("$Scan/Swipe Card");
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
}
//Reading from the card
String tag = "";
for (byte j = 0; j < mfrc522.uid.size; j++)
{
tag.concat(String(mfrc522.uid.uidByte[j] < 0x10 ? " 0" : " "));
tag.concat(String(mfrc522.uid.uidByte[j], HEX));
}
tag.toUpperCase();
//Checking the card
if (tag.substring(1) == tagUID)
{
// If UID of tag is matched.
lcd.clear();
lcd.print("Please Wait...");
delay(1000);
lcd.clear();
lcd.print("Card Approved");
digitalWrite(greenLed, HIGH);
delay(1000);
digitalWrite(greenLed, LOW);
lcd.clear();
lcd.print("Enter Password:");
lcd.setCursor(0, 1);
RFIDMode = false; // Make RFID mode false
}
else
{
// If UID of tag is not matched.
lcd.clear();
lcd.print("Please Wait...");
delay(1000);
lcd.setCursor(0, 0);
lcd.print("Card Declined!");
lcd.setCursor(0, 1);
lcd.print("Access Denied");
digitalWrite(buzzerPin, HIGH);
digitalWrite(redLed, HIGH);
delay(3000);
digitalWrite(buzzerPin, LOW);
digitalWrite(redLed, LOW);
lcd.clear();
}
}
// If RFID mode is false, it will look for keys from keypad
if (RFIDMode == false) {
key_pressed = keypad_key.getKey(); // Storing keys
if (key_pressed)
{
password[i++] = key_pressed; // Storing in password variable
lcd.print("*");
}
if (i == 4) // If 4 keys are completed
{
delay(200);
if (!(strncmp(password, initial_password, 4))) // If password is matched
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Dispensing");
lcd.setCursor(0, 1);
lcd.print("Snack/Candy");
sg180.write(1); // Dispensing
digitalWrite(greenLed, HIGH);
delay(3000);
digitalWrite(greenLed, LOW);
sg180.write(0); // Dispenced
lcd.clear();
delay(8000);
lcd.setCursor(0, 0);
lcd.print("Enjoy!");
lcd.setCursor(0, 1);
lcd.print(":D");
delay(2000);
lcd.clear();
i = 0;
RFIDMode = true; // Make RFID mode true
}
else // If password is not matched
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Wrong Password");
lcd.setCursor(0, 1);
lcd.print("Access Denied!");
digitalWrite(buzzerPin, HIGH);
digitalWrite(redLed, HIGH);
delay(3000);
digitalWrite(buzzerPin, LOW);
digitalWrite(redLed, LOW);
lcd.clear();
i = 0;
RFIDMode = true; // Make RFID mode true
}
}
}
}
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