BLINKING LED ARDUINO

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Blinking a LED in ARDUINO UNO IOT TUTORIAL

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  Blinking a LEDinARDUINO UNOBYSANA MATEEN
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  LED- A light-emittingdiodeA light-emitting diode (LED) is a semiconductor device that emits light when anelectric current flows through it.LEDs allow the current to flow in the forward direction and blocks the current in thereverse direction.LEDs have a wide range of applications ranging from your mobile phone to largeadvertising billboards. They mostly find applications in devices that show the timeand display different types of data.
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  Sketches are compiledby avr-gcc / avr-g++1. avr-gcc:It converts high-level C code into machine code that the microcontroller can execute.2. avr-g++:It compiles C++ code into machine code for the AVR architectureAvr microcontrollers:It is named in the honor of its developers, Alf-Egil Bogen and Vegard Wollan– It is based on C/C++ programming language• So, the program syntax is almost similar to C/C++◦ – Supported data types◦ – Variables◦ – Constants◦ – Control structure◦ – Looping structure◦ – Arrays◦ – Strings◦ – Function
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  A sketch consistsof two mandatory functions:• setup( ) -- it is executed once• loop( ) -- it is executed repeatedlySetup( ) is used for• initialization of serial communication• defining pinMode• declaring variablesLoop( ) is used for• writing the main code which has to execute continuously.• e.g. reading inputs from the sensors, triggering outputs to• the external device, etcpinMode (pin, mode) – It configures the specified pin to behave either as input or as output– By default the digital pins in Arduino function as input.– pin: is the number of the pin whose mode needs to be set– mode: can be INPUT, OUTPUT, INPUT_PULLUP.
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  digitalWrite(pin, value)– Usedfor output by using the LOW/HIGH logic level(i.e. 0V / 5V)– value: LOW / HIGHdelay(ms) – Pause the program for the amount of time(in millisecond) specified by ms