How to Use a Breadboard

A breadboard lets you build and change a circuit in minutes without soldering anything, which makes it the natural home for learning and prototyping. When you are ready to turn a working breadboard layout into a real project, Compoden's AI build assistant can recommend a matching in-stock kit with wiring and code. First, this guide explains how the board itself is wired.

What the holes connect to

A breadboard is full of holes that grip component legs, but they are not all separate. Inside, metal strips connect certain holes together. Understanding which holes share a strip is the whole secret to using one. Get that, and a breadboard stops being mysterious.

Rows, the centre gap, and rails

In the main area, holes are connected in short horizontal rows of five, each row separate from the next. A gap runs down the middle of the board; the rows on the left of the gap are not connected to those on the right. That gap is sized so a chip can straddle it, putting each pin in its own row. Along the long edges run the power rails, two continuous lines usually marked red for positive and blue or black for ground.

Powering the board

Connect your power source to the rails: positive to the red line and ground to the blue line. Then run short jumper wires from the rails into the rows wherever a component needs power. Many boards split the rails in the middle, so a jumper across the break keeps the whole rail live; it is worth checking with a continuity test.

Placing components and avoiding shorts

Place a component so its two legs sit in different rows, never in the same row, or you simply join its own two ends. To connect two components, put a leg of each in the same row, since that row is one electrical node. Keep leads from touching across the centre gap unless you intend it, and trim long legs so neighbouring rows do not accidentally bridge.

From breadboard to permanent build

A breadboard is for testing, not for keeps. Vibration and warm components can loosen connections over time, so once a circuit works reliably you usually move it to a soldered board for anything permanent, such as a robot or a drone that will be handled and shaken.

Build it with Compoden's AI

When your breadboard circuit works and you want it as a real, repeatable project, describe it to the AI build assistant. It will recommend an in-stock board and parts, the wiring, and code tuned to those exact components, then ship the kit. Start with the assistant or browse parts at /collections/all.

Learn the rows and rails once, and every future circuit goes together faster.

Are all the holes in a breadboard connected? No. Holes connect in short rows of five, with separate power rails along the edges and a gap splitting the two halves.

Why does my chip span the centre gap? The gap keeps each side of the chip's pins in its own row, so opposite pins are not shorted together.

Can I keep a project on a breadboard permanently? It is best for testing. Connections can loosen, so move reliable circuits to a soldered board for lasting use.