Getting started with Arduino; things to buy.

A friend of mine, Simon, has recently purchased an Arduino. He asked me, “how do I get started?”. Here is a list of the things that I’d recommend you purchase and why.

LEDs

Probably the simplest output indicator you can get: the LED. You can place the LEDs directly into the Arduino, as in the Blink tutorial. They provide a simple mechanism of getting information from the Arduino to you. With the Arduino’s 13 digital outputs can drive 13 LEDs. This number can be increased using components, such as, Shift Registers or techniques like charlieplexing.

Resistors

LEDs usually have a maximum voltage of ~2V. The Arduino’s outputs are 5v. For an Arduino to be able to power an LED the voltage must be reduced to by 3V. The simplest component to do this is a resistor. To figure out which values of resistor you will need, you can, use this helpful calculator. Make sure you get ~1/4W resistors as higher wattage means bigger components!

Breadboard

When you start to make circuits more complex than Blink, you will need something to prototype circuits on. A breadboard is a a solderless way of prototyping, which can be quickly put together and reused an unlimited number of times. Depending on the type, breadboards usually have horizontal strips, a gap in the middle for DIL components, such as ICs, and a pair of power lines marked on the sides. I only have two types of board, both are small, as I don’t make very complex circuits.

Wire & cutters/strippers


You can get quite far using the component leads to prototype, but its likely you are going to want to make connections from place to place, either from Arduino to breadboard or between components on the breadboard. To use wire with breadboard it needs to be solid core. To strip and cut wire, I just use a small pair of sharp side cutters.

Buttons

Although the above button has bent legs, they can easily be straightened to fit into a breadboard. Some electronics tutorials will tell you you require ‘pull-down’ resistors to use with the switch but this is not the case for the Arduino, as it has built in resistors, that can be turned on from software. It may still be worth getting a few 10K resistors to use with your switches.

What can I do with this stuff?

There is a good introduction to Arduino on Ladyada, where you will use need the stuff above to get started. In addition, I’ve made several different projects using just the above components, including, a POV Toy, an email notifier and a colour changing light.

Where next?

When you’ve finished with this stuff, you’ll probably want to look a different kinds of sensor. You can get a huge array of different types, such as temperature, light, acceleration or even blood alcohol content! For most simple sensors, you can use the Arduino’s analog inputs, for more complicated things you might have to use a number of digital pins or possibly I2C or SPI. There is a lot to learn about sensors, but that probably another blog post.

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