I just received my RC522 RFID reader and made this simple Arduino access control system that uses the reader, a buzzer for the alarm and a relay shield for the security system. The relay can be used ...

The use of Radio Frequency IDentification (RFID) technologies is growing. Many different applications are implemented in various sectors, and used for very different purposes. RFID enables wireless ...

I tap my phone to a screen to enter the metro station. I tap a card to open a locked door. What is the technology behind this? To get a better understanding, I did some hands-on learning with some ...