Hello friends, I hope you all are doing great. In today's tutorial, I am going to share a new PC817 Library for Proteus . PC817 is an optocoupler / optoisolator, which is used for electrical isolation between components or modules. It's normally used after Microcontroller Pins so that back emf doesn't burn them. You should also have a look at Introduction to PC817 , I have shared its complete details there. Updates PC817 Library for Proteus Latest version: V1.0 (February 2019, this tutorial) Other component libraries: C945 Transistor · Relay Module · Resistor · 5 mm LED · Designer Colour LED · Push Button · Active Buzzer · Electrolytic Capacitor · Ceramic Capacitor · Tantalum Capacitor · Film Capacitor · 1N4007 Diode · Zener Diode · Schottky Diode · Supercapacitor · Photodiode · RGB LED · ...