The Arduino UNO board layout
LEDs on Arduino UNO board
- The Power LED indicates that the board has power.
- The TX and RX LEDs indicate serial communications traffic.
- TX is blinking when transmitting, and RX is blinking when receiving.
- The Pin 13 LED is connected to the Arduino Digital I/O pin 13 and can be used for a variety of software tests without having to add any external hardware to see the software in action.
Read more
How an Arduino Program Works———->
Arduino Uno Pinout diagram———–>