Plug the RFID module into the breadboard with enough space around it. Connect the VCC pin to the Arduino's 3.3V (not 5V), and GND to the ground rail. For the data connections, wire SDA to Pin 10, SCK ...

A Laser Security Alarm System using Arduino UNO, LDR, buzzer, and LEDs. ... Arduino UNO, LDR, buzzer, and LEDs. Detects interruption in laser beam and triggers an alarm. Ideal for beginner-level IoT ...