Arduino LED

Flashing a LED by Arduino

Purpose of this tutorial:

Flashing a LED using an Arduino board is a common and simple project that can be used to learn the basics of using an Arduino board. Here are the basic steps to get started:

  1. Connect the LED to your Arduino board: The LED has two pins (anode and cathode), which you will need to connect to the corresponding digital pins on your Arduino board. The anode (positive) pin of the LED should be connected to a digital pin on the Arduino board and the cathode (negative) pin should be connected to the GND pin of the Arduino board.
  2. Write code to control the LED: You will need to use the digitalWrite() function in your Arduino sketch to control the LED.

The purpose of this tutorial is to flash an LED through the Arduino board: illuminate and switch off the LED alternately at 1 second intervals.

Necessary components:

Arduino UNO

The Arduino UNO is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button. It is the most popular and widely used board among the Arduino boards.

The Arduino UNO can be programmed using the Arduino programming language, which is based on C++. It uses a simple and intuitive programming environment, making it easy for beginners to get started with microcontroller programming.

The Arduino UNO can be connected to various sensors and actuators to control different devices and perform different tasks. For example, it can be used to control motors, read data from sensors, display information on an LCD screen, and communicate with other devices via serial communication protocols such as I2C and SPI.

The Arduino UNO can also be powered by a USB cable or an external power supply, making it easy to use in a wide range of projects and applications. It’s compatible with a wide range of shields (expansion boards) that adds functionality to the board, such as Ethernet, WiFi, and Bluetooth, and it’s widely supported by a strong and active community, which provides a lot of tutorials, examples and libraries to help users to get the most of the board.

1 red LED

An LED (Light Emitting Diode) is a semiconductor device that emits light when an electric current is passed through it. LEDs are widely used in a variety of applications because they are energy-efficient, have a long lifespan, and are available in a wide range of colors.

LEDs can be found in many electronic devices such as televisions, smartphones, computers, and traffic lights. They are also used in automotive lighting, general illumination, and as indicator lights.

1 resistor of 220Ω

Resistors are passive electronic components that are used to control the flow of electric current in a circuit. They are typically made of a conductive material, such as carbon or metal, that resists the flow of electricity. The resistance of a resistor is measured in ohms (Ω). Resistors can be used to divide voltage, limit current, and bias active devices. They are widely used in electronic circuits for a wide range of applications.

connecting wires

Connecting wires are used to connect various components in an electronic circuit. They allow for the transfer of electricity, data, or signals between different devices and components.

When connecting wires to an Arduino or other microcontroller, it is important to pay attention to the correct pinout. The pinout refers to the arrangement of pins on the microcontroller and the corresponding function of each pin. The Arduino pinout can be found in the documentation provided by the manufacturer, or in various resources available online.

test plate

A test plate, also known as a test jig, is a device used to test electronic circuits and components. It is a board or plate that has been designed to hold and connect various components and devices in a specific configuration, allowing for the easy testing and measurement of their performance.

A test plate can be used to test various types of electronic circuits and components, such as microcontrollers, sensors, and actuators. It typically includes connectors and sockets for connecting wires, power supply and measurement devices such as multimeters, oscilloscopes, and power supplies.


As for mounting, it is easy to connect LEDs to Arduino.

  • Connect the digital (digital) terminal number 1 of the Arduino board to the resistor leg Then
  • connect the second resistor leg to the anode (terminal +) of the LED
  • Finally connect the cathode (terminal -) of LEDs to the GND of the Arduino.


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