Proteus Professional 8.12 is a premier Electronic Design Automation (EDA) tool used for schematic capture, simulation, and PCB layout. While it is a paid professional software, you can access it legally through the official free trial provided by Labcenter Electronics. How to Get the Free Trial

This is the defining feature of Proteus. It allows the co-simulation of high-level language code running on microcontroller models alongside the analog and digital electronics connected to them. In Proteus 8.12, you can write C code for a PIC or Arduino and see how it affects LEDs, LCDs, and motors in real-time.

: Go to the Proteus Free Trial page.

Version 8.12 was only free for existing customers whose Update Service Contract (USC) was valid as of February 1, 2021. Demo Version: There is a free trial/demo version available on the official website. This version is not time-limited