Schematics Best Practices

A well-drawn schematic communicates intent, not just connectivity. Here's what separates readable schematics from spaghetti.

Hierarchy: power flows top-to-bottom, signal flows left-to-right. The power supply circuit is at the top; the output circuitry (display, actuators) is at the bottom. This convention lets a reader visually trace signal flow naturally.

Power symbols: use power net symbols (VCC, GND, +3V3) rather than drawing power lines across the schematic. Power lines running across large schematics are impossible to trace and prone to missed connections. Every VCC and GND symbol on the schematic automatically connects to every other with the same name.

Decoupling caps: place them in the schematic adjacent to the IC they serve, with clear reference designators. A decoupling cap placed far from its IC in the schematic tends to end up far from it in the layout too.