Hey, In today's blog we are going to make a fingerprint based car ignition system. WHAT YOU NEED : Arduino nano R305 fingerprint sensor EM18 RFID reader 16×2 LCD display DC motor L293D motor driver Breadboard Connecting wire 12v battery CODE : #include <Adafruit_Fingerprint.h> #include <LiquidCrystal.h> char input[12]; int count = 0; int a = 0; const int rs = 6, en = 7, d4 = 2, d5 = 3, d6 = 4, d7 = 5; LiquidCrystal lcd(rs, en, d4, d5, d6, d7); SoftwareSerial mySerial(12,11); Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial); void setup() { pinMode(9,OUTPUT); pinMode(10,OUTPUT); digitalWrite(9,LOW); digitalWrite(10,LOW); Serial.begin(9600); lcd.begin(16, 2); lcd.setCursor(0, 0); lcd.print( " WELCOME TO " ); lcd.setCursor(0, 1); lcd.print( " CIRCUIT DIGEST ...