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  • Author Author: tariq.ahmad
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Introduction to Arduino

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Arduino is a family of circuit boards that make microcontrollers easy to use. The microcontroller on the Arduino Uno circuit board is an Atmel AVR 8 bit chip. A microcontroller is basically a tiny, low powered computer that can run small simple computer programs. Atmel AVR microcontrollers are notable for being one of the first microcontrollers to use on-chip flash memory for program storage.

 

What made the Arduino popular, and the board of choice for so many maker projects Arduino is designed to make it easy to program microcontrollers thanks to the Arduino software development environment.  Before Arduino, you would typically have to type out a lot of binary and memorize a lot of hard to remember registers and instructions. You’d also have to use special programming hardware with custom cables to upload your program to your microcontroller.

 

Arduino got rid of all of that by creating the cross platform Arduino IDE that works with Windows, Mac, and Linux. Uploading your code to Arduino is as simple as connecting a USB cable to your board and clicking a button.You still can’t run a full operating system on an Arduino board, although there are microcontrollers out there that have progressed to the point where you can install an OS.  (Just not Linux, Linux variants, or Windows because of the resources required)

 

What Arduino is good for is for acting as the microcontroller “brain” of your electronics projects.  Because it is well supported there are code snippets that are all over the Internet that allow even beginners to do all kinds of complex electronics & design projects that they probably aren’t aware they could do because they don’t have the technical background.

 

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This has all kinds of implications for creative artists that come up with good ideas, and have a natural interest in making devices that are beautiful.

 

The Arduino IDE

 

The USB cable you use to upload programs, referred to as sketches, also powers the Arduino board.   You could also get a separate power supply and a lot of projects involve connecting the Arduino to some sort of battery.

 

A sketch is what you use the Arduino IDE for.  It is a unit of code that is uploaded and used to upload your programs to the microcontroller on your board.  You can run only one program at a time with on an Arduino board.

 

The Arduino IDE supports the languages C and C++ using special rules of code structuring.  The reason for this is to make programming your board as simple as possible.

 

A minimal Arduino C/C++ sketch consists of two functions:

  • setup() – the function that is called once, when the sketch starts after you power-up or reset your board. It initializes the variables, input and output pin modes, and other libraries needed in the sketch.
  • loop () – after setup () function is run the loop () function is executed repeatedly in the main program. It controls the board until it is turned off or reset.

 

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For those who have programmed C or C++, you know there's a bit of a learning curve, especially if you have no prior programming experience. Arduino simplified their programming environment with these people in mind. They want creative artists to make something beautiful so what they did is made it as simple as possible to program their board.

 

Its called the Arduino IDE and it's also a good place to start if you’ve never programmed a microcontroller.  It’s possible that you’ll start with and then move onto other development boards down the line.  If you do so you'll likely be on your own for most things.  That's because, what makes the Arduino special is the tremendous support and documentation that already exists around you.  It lets you jump right into advanced projects because so many people have provided their work on it, freely and openly.

 

There are also a lot of code snippets that you can use, to make your life even easier, thanks to the support of the open source community that has rallied behind it’s platform.

 

 

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  • in reply to BigG

    I recall the physically massive in-circuit emulators that cost $$$$, and they were considered a normal route to development at one time : ) I'm so glad that software-based techniques, more reliable build tools and APIs, complete absence of needing to decipher linker files with Arduino, and as you say techniques like UART + having plenty of memory for debug statements has made life easier, lowering many barriers.

  • That's a nice concise intro.

     

    As a systems type person I loved the fact that they (i.e. designers of Arduino) focused on simplifying the interface between the brain (i.e. MCU) and what it sees (i.e. the sensors) or what it does via outputs through the concept of stackable shields. This seems to be core and I noticed that have made some lovely improvements with the MKR series where the pin labels now printed on the headers for quick and easy reference.

     

    The bold step on their part, in my opinion, was doing away with a live debugging interface inside the Arduino IDE, which you have with most other MCU IDE's. I found this tricky to get used to but it taught me to change my development methodologies by forcing me to take little steps at a time and making the most of the serial UART port... and oh yes they also hide much of the other tricky stuff like referencing ports with pins.

  • Nice Intro.

    I sort of jumped into the deep end with Arduino.

    I'd been playing with Picaxe using their programmer which uses BASIC.

    The publisher of TheShed mentioned Arduino and I jumped online to our local supplier and brought one.

     

    I had great exectations of the possibilities and then realised it used C++ and I was stuck in BASIC. image

     

     

    BUT I have to say the transistion was easier than I thought, and it is definately something I never regretted.

     

    The Picaxe world is still stuck with a few boards or custom pcbs, while Arduino has a huge range of 'off the shelf' products that can be used.

     

     

    I'm glad I ventured into Arduino, but the problem is I'm now reluctant to step outside into other IDE's because it's so easy.

     

     

    Cheers

    Mark

  • It was a great introduction : ) I was a slow user to Arduino (I'd used just the C compiler for the AVR in the past), but I came to see that even for non-Arduino users, the Arduino 'API' became ubiquitous. Even non-Arduino environments now have functions like 'digitalWrite'. In the past, I'd have to flex some bit operators and shifts in C, simplified with #defines..

    mbed too uses a very similar set of function names as Arduino does, to simplify things for users moving from one platform to another.

  • Thanks Tariq,

    Nice Introduction to Arduino. For people who want to do something with electronics the Arduino make an excellent entry point.

    John