Why are TX, RX lights glowing constantly in the Arduino Uno board? - Quora
Getting Started with Arduino - LED Blinking
Generic 5mm IR Tramitter And Receiver LED - IR LED - TX RX - Photo Diode (Transmitter LED 5 Pcs + Receiver Ir LED 5 Pcs) : Amazon.in: Industrial & Scientific
YAMAHA RX 100 FULL LED CONCEPT BY AVMOD - YouTube
arduino uno - How to pass rx/tx led outputs to a shield - Arduino Stack Exchange