Since the interrupt signal comes from outside the Arduino it is called as external interrupt. Arduino Uno R3 has two external interrupts: int.0 (pin 2) and int.1 (pin 3). While connecting a RT to ...

Here, the three LEDs are directly connected to Arduino pins with independent current limiting resistors (R1, R2 and R3 ... pin for Digital Pin 9 (D9) on the Arduino. If you want to see the pinout for ...

Then, chances are you already know what an Arduino is ... In fact, the original Uno has already been retired. That said, we'll be focusing on the Uno R3 in this discussion instead.