Arduino Micro has some extra leds that it is tricky to programme. Like almost all Arduinos, has a built-in led – the green one on the left in the photo. And it has a pair of yellow leds – called TX ...

I just received my RC522 RFID ... will talk about the Arduino sketch which is very important. So, let’s start by watching this 7 minutes video to see the entire system in action: The resetAlarm ...