Introduce to Arduino Uno Board

November 21, 2018

What is Arduino :

Arduino is Associate in Nursing open supply programmable circuit card which will be integrated into a large form of make space comes each easy and complicated. This board contains a microcontroller that is in a position to be programmed to sense and management objects within the physical world. By responding to sensors and inputs, the Arduino is in a position to act with an oversized array of outputs like LEDs, motors, and displays.



Arduino was introduced back in 2005 in Italia by Massimo Banzi as the way for non-engineers to possess access to an occasional price, easy tool for making hardware comes. Since the board is ASCII text file, it’s discharged underneath an ingenious Commons license that permits anyone to supply their own board. If you search the online, you’ll realize there are many Arduino compatible clones and variations accessible however the sole official boards have Arduino in its name. Over the years Arduino has been the brain of thousands of comes, from everyday objects to complicated scientific instruments. A worldwide community of manufacturers – students, hobbyists, artists, programmers, and professionals – has gathered around this ASCII text file platform, their contributions have another up to an improbable quantity of accessible data which will be of nice facilitate to novices and consultants alike.

Arduino was born at the Ivrea Interaction style Institute as a straightforward tool for quick prototyping, aimed toward students while not a background in physics and programming. As presently because it reached a wider community, the Arduino board started ever-changing to adapt to new desires and challenges, differentiating its supply from easy 8-bit boards to product for IoT applications, wearable, 3D printing, and embedded environments.

Arduino For Beginners :


Fig: Arduino UNO R3

More and additional maker areas around the world area unit wanting to feature secret writing and physical science to their maker teaching programs. one among the most effective ways in which ANd do} this is often by integration an Arduino board into makers pace comes and lessons.

We’ve found that tons of maker educators haven’t taken the plunge into secret writing or Arduino as a result of they suppose programming is horrifying. due to this, we tend to wished to create certain this tutorial was written for absolutely the beginner with no expertise any. This tutorial could be a high-level read of all the components and items of the Arduino system. In future posts, we’ll take you to step by step in making your initial easy Arduino project.

Different Types Of Arduino Boards :

  • Arduino Uno (R3) 
  • LilyPad Arduino
  • Red Board
  • Arduino Mega (R3)
  • Arduino Leonardo

Arduino Uno :


Fig: Arduino UNO-R3 Board

One of the foremost widespread Arduino boards out there’s the Arduino Uno. whereas it had been not truly the primary board to be discharged, it remains to be the foremost actively used and most generally documented on the market. attributable to its extreme quality, the Arduino Uno encompasses a ton of project tutorials and forums around the internet which will assist you to start or out of a jam. We’re huge fans of the Uno attributable to its nice options and simple use.

The Uno could be a Brobdingnagian possibility for your initial Arduino. It consists of 14-digital I/O pins, wherever 6-pins are often used as PWM, 6-analog inputs, a push button, an influence jack, a USB association and a lot of. It includes everything needed to carry up the microcontroller; merely attach it to a computer with the assistance of a USB cable and provides the provision to induce started with associate AC-to-DC adapter or battery.

Arduino Uno 16Mhz ATmega328 2KB SRAM, 32KB flash 14 6 input, 0 output

Pins of Arduino Uno Board :

General Pin

  • LED: There is a built-in LED driven by digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it’s off.
  • VIN: The input voltage to the Arduino/Genuine board when it’s using an external power source. You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.
  • 5V: This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 – 20V), the USB connector (5V), or the VIN pin of the board (7-20V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage the board.
  • 3V3: A 3.3 volt supply generated by the onboard regulator. A maximum current draw is 50 mA.
  • GND: Ground pins.
  • IOREF: This pin on the Arduino/Genuine board provides the voltage reference with which the microcontroller operates. A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs to work with the 5V or 3.3V.
  • Reset: Typically used to add a reset button to shields which block the one on the board.


Special Pin Functions :

  • Serial: pins 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the ATmega8U2 USB-to-TTL Serial chip.
  • External Interrupts pins 2 and 3. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value.
  • PWM(Pulse Width Modulation) : 3, 5, 6, 9, 10, and 11 Can provide 8-bit PWM output with the analogWrite function.
  • SPI(Serial Peripheral Interface) : 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication using the SPI library.
  • TWI(Two Wire Interface): A4 or SDA pin and A5 or SCL pin. Support TWI communication using the Wire library.
  • AREF(Analog REFerence): Reference voltage for the analog inputs.


Power (USB / Barrel Jack) :

Every Arduino board wants how to be connected to an influence supply. The Arduino UNO is often powered from a USB cable coming back from your pc or a wall power offer (like this) that are terminated in a very barrel jack. within the image higher than the USB affiliation is labeled (1) and also the barrel jack is labeled (2).

The USB affiliation is additionally, however, you may load code onto your Arduino board. additional on a way to program with Arduino are often found in our putting in and Programming Arduino tutorial. don’t use an influence offer larger than twenty Volts as you may overpower (and thereby destroy) your Arduino. The suggested voltage for many Arduino models is between six and twelve Volts.


Reset Button :

Just like the first Nintendo, the Arduino incorporates a button (10). Pushing it’ll briefly connect the reset pin to ground and restart any code that’s loaded on the Arduino. this may be terribly helpful if your code doesn’t repeat, however, you wish to check it multiple times. not like the first Nintendo but, processing on the Arduino doesn’t sometimes fix any issues.


Power LED Indicator :

Just below and to the proper of the word “UNO” on your printed circuit, there’s a small crystal rectifier next to the word ‘ON’ (11). This crystal rectifier ought to light whenever you plug your Arduino into an influence supply. If this lightweight doesn’t activate, there’s a decent probability one thing is wrong. Time to re-check your circuit.



TX is brief for transmission, RX is brief for receive. These markings seem quite a bit in physical science to point the pins accountable for serial communication. In our case, there area unit 2 places on the Arduino UNO wherever American state and RX seem – once by digital pins zero and one, and a second time next to the American state and RX indicator LEDs (12). These LEDs can provide the USA some nice visual indications once ever our Arduino is receiving or transmission information (like when we’re loading a brand new program onto the board).


Main IC :

The black factor with all the metal legs is AN IC, or microcircuit (13). think about it because of the brains of our Arduino. the most IC on the Arduino is slightly totally different from board kind to board kind, however, is typically from the ATmega line of IC’s from the ATMEL company. this will be necessary, as you’ll have to be compelled to recognize the IC kind (along with your board type) before loading up a brand new program from the Arduino computer code. This data will sometimes be found in writing on the highest aspect of the IC. If you wish to grasp additional regarding the distinction between numerous IC’s, reading the datasheets is usually a decent plan.

Voltage Regulator :

The transformer (14) isn’t really one thing you’ll (or should) move with on the Arduino. however, it’s doubtless helpful to grasp that it’s there and what it’s for. The transformer will precisely what it says – it controls the quantity of voltage that’s let into the Arduino board. think about it as a form of gatekeeper; it’ll shrink back an additional voltage which may damage the circuit. Of course, it’s its limits, therefore don’t attach your Arduino to something larger than twenty volts.


You can watch the following video or read the written tutorial below.

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