VSM Simulation

The Proteus Design Suite is unique in offering the ability to co-simulate both high and low-level micro-controller code in the context of a mixed-mode SPICE circuit simulation.

VSM in Education

Information on using Proteus VSM as a learning tool in education.

VSM for Business

The advantages of using Proteus VSM as a productivity tool in industry.

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Download a demonstration copy of Proteus.


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What is Proteus VSM?

A detailed overview of our unique embedded simulation technology.

VSM Studio IDE

The VSM Studio IDE provides an integrated environment for your firmware development.

Advanced Simulation Features

The Advanced Simulation Features product adds graph based analysis to your Proteus simulation.

USB Simulation

Proteus USB simulation is a unique product for developing USB device products.

IoT Builder

IoT Builder makes it quick and easy to control remote Arduino™ & Raspberry Pi® electronics from a mobile device.

Embedded Peripherals

A listing of just some of the embedded peripherals models available as standard with Proteus VSM.

Supported Compilers

How to use your favorite toolchain with Proteus VSM.

VSM for Microchip™

Including the PIC10, PIC12, PIC16, PIC18, PIC24 & dsPIC33 range of microcontrollers.

VSM for ARM®

Including the Cortex™-M0, Cortex™-M3, Cortex™-M4 & ARM® LPC2000 MCU's.

VSM for Atmel®

Including ATTINY, AT90S, ATMEGA, 8051 and ARM microcontrollers.

VSM for Arduino™

Full support for popular Arduino boards and dozens of ready made shields.


Including 8051 and ARM microcontrollers.

VSM for Texas Instruments™

Including MSP430, PICCOLO and ARM microcontroller variants.

PCB Layout

Proteus PCB design software seamlessly combines Schematic Capture and PCB layout to provide a powerful, integrated and easy to use suite of tools for professional PCB Design.

Proteus PCB Design software In Business

Powerful productivity tools used across the world.

Proteus PCB Design software In Education

Teach modern PCB design techniques with commercial grade tools.

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Download a demonstration copy of Proteus.


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Schematic Capture Overview

A powerful design environment for modern electronics.

Hierarchical Design

Multi-sheet hierarchical design.

Design Reuse

Project Clips enables re-use of schematic and layout circuitry in future projects.

Bill Of Materials

Fully customisable Bill of materials reporting module.

Assembly Variants

Use managed assembly variants to create different product configurations from a single schematic.

Advanced Simulation Features

The Advanced Simulation Features product adds graph based analysis to your Proteus simulation.

PCB Layout Overview

A layout tool packed full of powerful, easy to use functionality.

Design Verification

User extendable, constraint driven design with an intuitive interface.

Automatic Length Matching

Full control over serpentine/accordion routing.


World Class shape based auto-routing included as standard with all packages.

MCAD Integration

Direct import of STEP/IGES models and export of STEP assemblies to mechanical CAD tools.

3D Viewer

Integrated 3D Visualization of the PCB with bare board view and height bounds check.

Project Notes

Documentation/reporting for your pcb design

Proteus Visual Designer

Proteus Visual Designer combines world class Proteus VSM simulation with a new flowchart programming engine to provide a truly integrated and intuitive development environment.

Proteus In Education

A global standard in education.

Download Evaluation

Evaluate the full set of features available in Proteus.

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Proteus Visual Designer

Flowchart programming integrated with Proteus VSM simulation to provide a complete Arduino or Raspberry Pi development solution.

Visual Designer for Arduino™

Visual Designer includes dozens of pre-made Arduino Shields, Grove Sensors and Generic Breakout Boards to make hardware design easy.

Visual Designer for Raspberry Pi®

Visual Designer includes dozens of pre-made Pi Hats, Grove Sensors and Generic Breakout Boards to make hardware design easy.

Visual Designer Projects

Student projects using Visual Designer.

IoT Builder for Visual Designer

Easily control remote Arduino™ electronics from your mobile phone or tablet with Visual Designer and IoT Builder.

Virtual Turtle Robot Simulation

Program virtual Arduino™ turtles like the Funduino and Zumo, simulate, test and debug in Proteus and then deploy on the real hardware with a button press.

Advanced Simulation Features

The Advanced Simulation Features product adds graph based analysis to your Visual Designer simulations.

Ordering & Pricing

Learn more about the single user Proteus packages (enterprise and platinum) or use the product configurator to find a custom package.


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Buy Proteus VSM simulation

Buy Visual Designer

Buy Proteus Visual Designer

How to Order

Information on how to generate a quotation and place an order as well as payment methods and delivery charges.

Commercial Price List

View the complete, single user commercial price list and build your own quotation.

Educational Pricing

View the complete, single user educational price list and build your own quotation.

Quotation Wizard

Our dynamic quotation wizard will guide your product selection and generate a custom quotation for you.

Upgrades and Maintenance

An explanation of the Proteus Update Service Contract, how it works and your software update options.

Terms Of Business

Important legal information on things like pricing, purchasing, payment, warranty and liability.

Contact Us

Contact Labcenter with any inquiry or for more information.

Find a Distributor

Find and contact a Labcenter Distributor near you.

Questions & Answers

Common questions and answers for potential customers.

Support & Contact

Technical support movies and links are found here along with contact details for Labcenter and our authorized distribution partners.

Contact Us

Contact Labcenter with any enquiry or for more information.

Find a Distributor

Find and contact a Labcenter Distributor near you.

How To Movies

Lots of tutorials and short movies showing you how to get the most out of the Proteus Design Suite.

Latest Release

Information on the latest features and additions to the Proteus Design Suite.

Technical Support

Details on technical support options available to Proteus users.


Links to some support downloads that may be relevant to some use of the Proteus software.

About Us

A short company profile and some information about Labcenter Electronics Ltd.


The latest company and Proteus news.


The lastest articles from our PCB experts


Career opportunities with Labcenter Electronics.

Making sure that there are safe clearances between objects on the PCB is a top priority. Modern electronic products are more complex than ever before, operating at higher speeds and needing to fit into smaller enclosures; this means we need more control over electrical clearances during board layout. Fortunately, the EDA industry has a well established and fairly standardized system for specifying electrical design rules, allowing us to limit a rule to a physical area of the PCB and/or to a certain number of signals.

Physical Scope

Physical scope starts of course with the entire PCB. There is always a board rule, sometimes called the default rule. This rule applies everywhere on the board that is not overridden by another rule. At its simplest level we define a distance between pads, between a track and a pad and between two tracks. The EDA tool will then monitor the distances between objects as the PCB is placed and routed and will warn us if objects violate the specified clearances.

It’s very common however to want different clearances between objects in different parts of the PCB. For example, we may allow the space between tracks on inner layers to be smaller because they are better protected from things like dust and condensation. To do this a layer rule would be created with different clearances which would override the board rule on the specified layer.

Another common requirement is for tight clearances on several layers in the area inside and around a fine pitch SMD or BGA to enable all of the signals to fanout and escape onto the board. This type of rule is called a region rule or a room rule and may be handled differently by different EDA tools. In Proteus, the room tool is used to draw out the area, specify which layers it applies to and give it a name. Then a rule is created that applies to that named area and the necessary clearances are defined.

Electrical Scope

Sometimes the requirement is to apply clearances to types of signal rather than to physical areas. For example, more space may be required around power tracks than low current signal tracks. This is where net classes and electrical scope becomes useful. A net class is just a user named set of signals that will have common properties on the layout. These properties include things like track width, via style used and of course clearances. Once the net class is created, the user simply adds a design rule that applies to the named net class and specifies the required clearances.

Adding Design Room Rules

It is even possible to create more granular electrical rules. For example, you can set up a rule which applies to a net class only with respect to other objects on the same net class. This would let you define specific clearances between two tracks on the same net class such as a differential pair.

Priority Levels

Given all these possibilities, how do we know which rule applies between two objects? Different EDA tools work in different ways of course, but the priority levels of rules are pretty standard across the industry.

At the top level we have the board rule or default rule. This will apply everywhere if no other rules are added. After that, the priority of rules in physical scope is fairly obvious with a layer rule overriding the board rule on its designated layer and a room rule taking precedence over both in the area of the board it applies to. The smaller the physical scope the higher the priority.

Interspersed with these are rules that also have an electrical scope (class rules). These take priority over standard rules with the same physical scope. Those rules that target only one net class with respect to another (class class rules) are the highest priority inside a given physical scope.

The basic principle is that the narrower the set of objects the rule applies to, the higher the priority of the rule.

The other important thing to remember is that a room rule wipes out all other rules that might affect the area of the room. It’s easiest therefore to think of a room as a mini-board and start again with design rules inside the room.

This all sounds very complicated but after a little while in use you’ll find it does actually make sense. Also, the chances are good that you won’t need to use all of the different priority levels but it’s useful to know that the flexibility is there if you need it.

Rule Hierarchy

If you’d like to learn more about how to set up and work with design rules in the Proteus Design Suite watch this video:

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