ATM System With Arduino Refuses To Work, Help will be much appreciated 😊

Projects Programming
4

Hi,
keyA is on line 32

Where did you get this code?

What is this KeyA?

Try this code:

Added line 14 and modified line 34.

#include <MFRC522.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define SS_PIN 10
#define RST_PIN 9

MFRC522 mfrc522(SS_PIN, RST_PIN);
LiquidCrystal_I2C lcd(0x3F, 16, 2);

int buttonPin = 2;
int points = 0;

MFRC522::MIFARE_Key keyA;

void setup() {
  Serial.begin(9600);
  SPI.begin();
  mfrc522.PCD_Init();
  lcd.init();
  lcd.backlight();
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  // Look for new cards
  if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) {
    byte blockNumber = 4;
    byte trailerBlock = 7;
    byte buffer[18];
    byte size = sizeof(buffer);

    // Authenticate using key A
    if ((MFRC522::StatusCode) mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &keyA, &(mfrc522.uid))) {
      // Read data from the block
      if (mfrc522.MIFARE_Read(blockNumber, buffer, &size) == MFRC522::STATUS_OK) {
        // Extract the points
        points = buffer[0];
        Serial.print("Points: ");
        Serial.println(points);
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Points: ");
        lcd.print(points);
        lcd.setCursor(0, 1);
        lcd.print("Hold card & press");

        // Wait for button press
        while (digitalRead(buttonPin) == HIGH) {}

        // Add ten points
        points += 10;
        Serial.print("New points: ");
        Serial.println(points);
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Credit Added");
        lcd.setCursor(0, 1);
        lcd.print("Remove card");
        delay(1000);

        // Write the new points to the block
        buffer[0] = points;
        if (mfrc522.MIFARE_Write(blockNumber, buffer, 16) == MFRC522::STATUS_OK) {
          Serial.println("Points updated on card");
        }
      }
      // Stop crypto1 communication
      mfrc522.PCD_StopCrypto1();
    }
    // Halt PICC
    mfrc522.PICC_HaltA();
    // Stop encryption on PCD
    mfrc522.PCD_StopCrypto1();
    delay(1000);
    lcd.clear();
  }
}