PCB Layout in EasyEDA Pro: Routing, Design Rules, and Copper Pour

From Schematic to Board

Imagine you have just finished your schematic, and now it is time to turn it into a real copper board. This is where PCB layout in EasyEDA Pro begins — the bridge between the theoretical drawing and the piece you will solder with your own hands. In this guide we walk through routing, design rules (DRC), and copper pour step by step.

When you run the Update PCB command, EasyEDA Pro transfers every component from the schematic into the PCB editor. The parts arrive stacked in a corner, connected by thin grey lines called the ratsnest.

The ratsnest is not copper — it is just a visual guide that says "this point must connect to that point." Your job in layout is to turn every grey line into a real copper trace.

The right starting mindset:

• Do not route immediately — place components first.
• Read the ratsnest to understand where signals cluster and where they branch.
• Think in signal flow: from input, to processing, to output.

Board Outline and Layer Management

Before anything else, the board needs a shape and size. The board outline is drawn on a dedicated layer (the Board Outline layer), and it is the shape the fab cuts the board to.

Drawing the Board Outline

• Use the drawing tool on the Board Outline layer to draw a rectangle or closed shape.
• Set the dimensions precisely (e.g. 50mm × 30mm) since they affect the price.
• Keep an edge clearance where no traces sit close to the rim, usually at least 0.3mm.

Choosing the Layer Count

In the Layer Manager you choose the number of copper layers:

Always start with 2 layers unless density or fast signals force you to add more. Each extra layer raises the cost.

Beyond copper, there are functional layers: Mechanical layers for fabrication dimensions and holes, and Keepout layers that forbid traces or components from entering a region (such as around a screw hole).

Smart Component Placement

Good placement makes routing easy; bad placement makes it a nightmare. The golden rule: place first, route later.

Placement strategy:

1. Group by function — put each sub-circuit (power, control, analog) in its own zone.
2. Connectors at the edges — USB ports, terminals, and headers belong at the board edge for access.
3. Decoupling caps near the ICs — place each decoupling capacitor as close as possible to the IC power pin.
4. Minimize crossings — rotate and flip parts so ratsnest lines cross as little as possible.

Cross-Probing

A powerful feature: when you select a component in the schematic, the same component highlights in the PCB, and vice versa. This cross-probe helps you locate mystery parts quickly, especially on crowded boards.

Practical tip: mentally draw the signal flow from left (input) to right (output) before you fix any part. Logical placement = shorter routing = less noise.

Manual and Interactive Routing

Now the real fun begins: turning ratsnest lines into copper traces. EasyEDA Pro offers an Interactive Router that follows your cursor and avoids obstacles automatically.

Routing essentials:

• Track Width: set the width based on current. Signal traces may be 0.2mm, while power lines need a much wider trace depending on amperage.
• Vias: when you need to move from the top layer to the bottom, drop a via — a plated hole linking the two layers.
• Differential Pairs: for high-speed signals like USB, EasyEDA Pro routes two parallel traces together with controlled spacing.
• Length Tuning: for synchronous fast signals, you add serpentine zig-zags to match trace lengths.
• Teardrops: smooth fillets between trace and pad that strengthen the connection mechanically.

Configuring Design Rules (DRC)

Before you route a single trace, set the rules. The Design Rule Manager is the gatekeeper that stops you from designing a board the fab cannot make.

Key rules:

• Clearance: the minimum allowed gap between two traces or between a trace and a pad.
• Min Track Width: the thinnest trace the fab accepts.
• Via Size: outer diameter and minimum drill diameter.
• Net Classes: groups with their own rules (e.g. a "Power" class with wider traces and larger clearance).

The decisive step: set the values to match the fab's capability (such as JLCPCB) and the minimums of the IPC-2221 standard before you start routing — not after. Editing rules after a full route means painful rework.

A common safe rule for hobby boards is 0.15mm clearance and 0.15mm minimum width, but always check the fab's capability sheet because they vary.

Copper Pour and the Ground Plane

Instead of routing every ground connection with a separate trace, we fill the empty regions with copper tied to ground. This copper pour is done with the Copper Area tool, and its most common use is the ground plane.

Why a Continuous Ground Plane?

• It provides a low-impedance return path for all currents.
• It reduces noise and electromagnetic interference (EMI).
• It improves heat dissipation.

Thermal Relief vs Solid Connect

Stitching Vias: when you have a ground pour on both layers, scatter vias that tie them together. This keeps a unified, low-impedance ground across the whole board and reduces radiation.

A continuous, unified ground plane is one of the biggest reasons a board works electrically. A fragmented or split ground causes noise problems that are hard to diagnose later.

Final Verification and 3D View

Before you send the board to be manufactured, run three checks you never skip:

1. Run DRC — trigger the design rule check. The result must be zero errors. Every clearance or width violation means a board that may fail.
2. Clear the ratsnest — confirm no grey line remains. A single leftover line means a forgotten connection the board will not work without.
3. 3D View — convert the board to a 3D model to visually inspect:
   • Component collisions (two parts too close).
   • Footprints of the wrong size or orientation.
   • Connectors and mechanical holes in the right places.

The 3D view catches errors a 2D layout never shows — like a tall capacitor hitting an adjacent connector. One minute here saves a full fabrication cycle.

Summary

PCB layout in EasyEDA Pro is an orderly journey from schematic to a manufacturable copper piece:

• Update PCB transfers the parts with a ratsnest that guides you.
• Draw the board outline and choose the layer count in the Layer Manager.
• Place components smartly by function before routing, using cross-probe.
• Route with the interactive router using proper track widths and vias where needed.
• Configure design rules (DRC) to match the fab and IPC-2221 before routing.
• Pour a continuous ground plane with thermal relief and stitching vias.
• Finish with a clean DRC, a cleared ratsnest, and a 3D check.

Next in our series: Libraries & Parts — where to find the right footprints and how to build your own components.