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Arduino Open Source Platform Unleashes Creativity
In much the same way that GNU, Linux, and other open source software turned the programming world on its head, open-source hardware platforms that support Arduino are starting to rewrite the rules of engagement for many embedded applications. Originally developed for the do-it-yourself (DIY) and hobbyist communities, the Arduino open-source electronics prototyping platform is based on flexible, easy-to-use hardware and software. While still wildly popular among artists, tinkerers, and other creative types, its low cost of entry, and a rapidly-growing ecosystem of royalty-free crowd-sourced IP are winning the loyalty of many commercial developers. In this brief survey, we will review the hardware and software behind Arduino, and some of the applications it is powering.
Figure 1: Priced at a small fraction of the cost of a traditional CNC machine, MakerBot’s Thing-O-Matic 3D printer uses Arduino processor boards to control its stepper motors, thermal print head and other electromechanical elements. This product turns inexpensive ABS filament feedstock into finished objects for prototyping or low-volume production with dimensional tolerances approaching 0.02 mm. (Courtesy of MakerBot Industries)
Arduino history
Arduino is not so much a specific product or technology, but an ecosystem of hardware, software, tools and human resources that have grown up around Atmel’s megaAVR family of 8-bit MCUs. Its compact boards, C++-derived programming language and programming environment owe much of their versatility and ease of use to the Wiring open-source prototyping platform created in 2003 by Hernando Barrag, a Colombian artist and programmer. Barrag’s goal was to simplify the development of electronic systems for hobbyists, artists, researchers, and other non-engineers while providing easy access to all the bells, whistles and hacks that seasoned developers need. Based on the
ATmega1281 and
ATmega2561 microcontrollers, the compact, inexpensive Wiring/WiringMini processor boards have been used to create everything from interactive toys and soccer-playing robots to controllers for scanning electron microscopes.
The Arduino platform was originally developed in Italy by Massimo Banzi and David Cuartielles in 2005 as a tool for student design projects. It expanded on the Wiring platform’s capabilities, adding some new programming features and a standard interconnect system, allowing the CPU board to be connected to a variety of interchangeable add-on modules (known as shields).
Arduino hardware
Like its predecessor, the Arduino open-source hardware platform is based on Atmel’s versatile
ATmega MCU family (Figure 2). ATmega’s modified Harvard-style AVR processor core combines a rich instruction set with 32 general purpose working registers. All 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in a single instruction cycle. ATmega MCUs are available with either 4 K or 8 Kbytes of in-system programmable flash (with read-while-write capabilities) plus various combinations of EEPROM (256/ 512/ 512/ 1 Kbytes) and SRAM (512/ 1 K/1 K/ 2 Kbytes).
Figure 2: A block diagram of Atmels’ ATmega MCU. (Courtesy of Atmel Microelectronics)
The AVR CPU is complimented with a powerful set of hardware functions and I/O capabilities. Although some MCUs have a slightly different configuration, with most devices include:
- 23 general purpose I/O lines
- a 6- or 8-channel 10-bit ADC
- six PWM Channels
- a serial programmable USART
- a byte-oriented 2-wire Serial Interface
- an SPI serial port
- three flexible Timer/Counters (with compare modes)
- a real Time Counter with Separate Oscillator
- a programmable Watchdog Timer with internal Oscillator
Form factors for all occasions
The Arduino bestiary is populated with an ever-growing number of processor boards that have been developed to accommodate a specific form factor or application. Most designs include a regulated power supply and a set of connections to assess its bus signals and control-oriented I/O. One of the most popular boards created by the Arduino team is the
Uno (Figure 3). The board includes a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. Its on-chip regulator allows it to be powered with an AC-to-DC adapter or battery, or from a USB cable connection.
Figure 3: Arduino Uno board. (Courtesy of Arduino.cc)
The Uno Board’s I/O female pin connectors provide access to the MCU’s 14 digital input/output pins and six analog inputs. Six of the I/O pins can be used as PWM outputs, a handy feature for everything from lighting dimmers to motor controllers. These connectors also make it possible to add auxiliary boards, known as shields, which can contain additional electronics and I/O connections.
The Arduino
Nano is a slightly more compact board based on the ATmega328 or ATmega168 that was designed specifically to be dropped onto breadboards (Figure 4a). For applications where space is at an even greater premium, the Arduino Mini (Figure 4b) is also available. Other variants feature breadboard areas for small circuits or on-board communication capabilities such as Bluetooth or Ethernet (Figure 4c). One of the most unique members of the Arduino family is the LilyPad, a board designed specifically for use in “smart apparel” and e-textiles (Figure 4d). The washable/wearable processor board can be sewn to fabric and connected to similarly-mounted power supplies, sensors and actuators using conductive thread.
Figure 4: Popular variants of the Arduino platform include the Nano (4a), the Mini (4b), the Arduino Ethernet (4c), and the washable/wearable LilyPad (4d). (Courtesy Arduino.cc)
Most of the “official” Arduino board designs are available as
preassembled boards,
quick-build kits and often as bare boards. Commercial designers (and hard-core DIY-ers) can roll their own boards from open-source hardware CAD files and download the Arduino software for use under an open-source license agreement.
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