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Author: isameersah

02_Test_RFID-RC522_LCD-20x4_Button.ino

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+//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> RFID + LCD + Button (Combined)
+//----------------------------------------Including the libraries.
+#include <LiquidCrystal_I2C.h>
+#include <SPI.h>
+#include <MFRC522.h>
+//----------------------------------------
+
+// Defines SS/SDA PIN and Reset PIN for RFID-RC522.
+#define SS_PIN  5  
+#define RST_PIN 4
+
+// Defines the button PIN.
+#define BTN_PIN 15
+
+// LCD configuration
+int lcdColumns = 20;
+int lcdRows = 4;
+
+// Variables
+int readsuccess;
+char str[32] = "";
+String UID_Result = "--------";
+
+// LCD object (address: 0x27, 20 cols, 4 rows)
+LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);
+
+// RFID object
+MFRC522 mfrc522(SS_PIN, RST_PIN);
+
+//________________________________________________________________________________byteArray_to_string()
+void byteArray_to_string(byte array[], unsigned int len, char buffer[]) {
+  for (unsigned int i = 0; i < len; i++) {
+    byte nib1 = (array[i] >> 4) & 0x0F;
+    byte nib2 = (array[i] >> 0) & 0x0F;
+    buffer[i*2+0] = nib1  < 0xA ? '0' + nib1  : 'A' + nib1  - 0xA;
+    buffer[i*2+1] = nib2  < 0xA ? '0' + nib2  : 'A' + nib2  - 0xA;
+  }
+  buffer[len*2] = '\0';
+}
+//________________________________________________________________________________
+
+//________________________________________________________________________________getUID()
+int getUID() {  
+  if(!mfrc522.PICC_IsNewCardPresent()) {
+    return 0;
+  }
+  if(!mfrc522.PICC_ReadCardSerial()) {
+    return 0;
+  }
+  
+  byteArray_to_string(mfrc522.uid.uidByte, mfrc522.uid.size, str);
+  UID_Result = str;
+
+  Serial.println();
+  Serial.print("UID : ");
+  Serial.println(UID_Result);
+  
+  mfrc522.PICC_HaltA();
+  mfrc522.PCD_StopCrypto1();
+  
+  return 1;
+}
+//________________________________________________________________________________
+
+//________________________________________________________________________________setup()
+void setup(){
+  // Start serial
+  Serial.begin(115200);
+  delay(1000);
+  Serial.println();
+  Serial.println("Please tap your card or keychain...");
+
+  // Setup button
+  pinMode(BTN_PIN, INPUT_PULLUP);
+  
+  // Init LCD
+  lcd.init();
+  lcd.backlight();
+  lcd.clear();
+
+  // Init SPI & RFID
+  SPI.begin();      
+  mfrc522.PCD_Init(); 
+  delay(1000);
+}
+//________________________________________________________________________________
+
+//________________________________________________________________________________loop()
+void loop(){
+  lcd.setCursor(0, 0);
+  lcd.print("Tap your card/key  ");
+
+  lcd.setCursor(0, 1);
+  lcd.print("or keychain        ");
+
+  lcd.setCursor(0, 2);
+  lcd.print("UID: ");
+  lcd.print(UID_Result);
+  lcd.print("        "); // Clear extra space
+
+  lcd.setCursor(0, 3);
+  lcd.print("BTN: ");
+  lcd.print(digitalRead(BTN_PIN));
+  lcd.print("          "); // Clear old text
+
+  readsuccess = getUID();
+ 
+  if(readsuccess){
+    delay(2000);
+  }
+
+  delay(100);
+}
+
+
+
+//________________________________________________________________________________
+//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<