Breadboard Basics: Build Your First Circuit (No Soldering)

A breadboard lets you build and rearrange circuits in seconds, with no soldering at all. If you're brand new to electronics, it's the perfect place to start. We'll go over how a breadboard actually works, then light up your first LED.

Parts you'll need

How a breadboard works

A breadboard looks busy, but it's really just a grid of holes that are secretly wired together in a fixed pattern:

  • The two long strips running down each side are the power rails, marked + and -. Every hole in a rail is connected along its full length.
  • In the main middle area, each column of five holes is joined together vertically.
  • The channel down the centre separates the top half from the bottom half, which is handy when you plug in a chip.

Nothing is connected until you connect it. Two component legs in the same column of five are joined together. To link anything else, you run a jumper wire across to another column or over to a rail.

Light your first LED

One thing trips up nearly every beginner: an LED only works one way round. The longer leg is positive (+) and the shorter leg is negative (-). Put it in backwards and it simply won't light, which is not the same as it being broken. (Our prewired LEDs have the leads marked, so you can't get it wrong.)

  1. Run a jumper from your board's 5V to the + rail, and another from GND to the - rail.
  2. Put the LED's long leg (+) into the + rail, and its short leg (-) into the - rail.
  3. Power it up and it lights. Try moving it to different holes to see which ones are connected.

Using a plain LED instead of a prewired one? You need a resistor (somewhere around 220 to 330 ohms) in line with it. Without one, too much current rushes through and the LED burns out almost instantly. Our 3mm prewired LEDs already have the right resistor built in, so there's nothing extra to add.

Where to go next

Once this clicks, add a button, a sensor or a microcontroller and start making things happen on their own. The whole point of a breadboard is that nothing is permanent, so if something doesn't work, pull the wire out and try again.

Start your first build

Everything you need to go from a blinking LED to a real project.

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