Breadboard

The best way to experiment with the Arduino/Genuino Uno or Mega, and electronic components in general, is to use a breadboard. A breadboard allows you to quickly connect components and wires to each other without soldering.

This breadboard has lugs that allow multiple boards to be placed side-by-side and edge plates to be fitted for securing larger components such as buttons and switches.

Here is a photo of a typical breadboard, with superimposed lines showing how its pinholes are connected internally:

Breadboard

By convention and for convenience, one of the bottom rows of pins is normally connected to a ground pin, labelled GND, on your Arduino/Genuino Uno or Mega, and/or the negative lead from your power supply.

One of the top rows of pins is normally connected to a pin labelled 5V on your Arduino/Genuino Uno or Mega, or the positive lead from your power supply (but not both).

The pins in the central columns can then be used for connecting components and wires to each other.

It is easiest to use stiff single-core wire with breadboard (or ready-made jumper wires) and to stick to a colour code, such as the following:

  • Use red wire for 5V from a power supply or your Arduino/Genuino Uno or Mega.
  • Use black wire for ground from a power supply or your Arduino/Genuino Uno or Mega.
  • Use yellow wire for 12V from a power supply.

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