Hardware components | ||||||
| × | 1 | ||||
![]() |
| × | 1 | |||
![]() |
| × | 1 | |||
![]() |
| × | 1 |
About:
How does it work:
Read moreI've seen so many YouTube videos and pictures of people making things like this however they never gave the code; so, I decided to make my own, the code for this was made especially for a vending machine or other things similar.
Pictures:1 / 4 • With wrong tag
To make this work you need to replace the RFID chip UID in the code with your own, after only the specified chip will be able to work. after you can set a 4-digit pin number with no letters to have as extra security.
Extra:On the breadboard, you can have a yellow LED or buzzer however buzzer is quite obnoxious.
/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
}
}
}
}
Comments
Please log in or sign up to comment.