I talked about some basic simulators for the 8051 micro-controller in my previous post. They are strictly for beginners (if you’re one) as you can only verify the output by checking the values on ports, pins, and internal registers etc. To be honest, that’s how you get to learn the basics and see how everything works internally in the micro-controller. However, sooner or later, you’ll be going a bit further (if you’re really interested) and will need to attach (interface) external hardware because that’s exactly how we intend to utilize a micro-controller. This is where Proteus comes in – a complete simulation platform.