Arduino 74HC595,Arduino 74HC595 interfacing, increase arduino output pins, arduino output increase, 74hc595 arduino Hello friends, I hope you all are doing great. In today's tutorial, I am going to show you Arduino 74HC595 Interfacing and we will have a loook at How to Increase Arduino Output Pins with 74HC595. Suppose you are working on some project where you need to control 20 LEDs with Arduino UNO and you know ....