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\nTutorial 10: Fade an LED: Arduino Course for Absolute Beginners (ReM)\n

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\n\nPublisher:\n\nProgramming Electronics Academy\n\n\n
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\nArduino Course for Absolute Beginners\n\nLets expand the repertoire of output that we can use by looking at the function analogWrite(). I experienced much confusion with analogWrite(), because I suspected that it had to do with the analog...\nArduino Course for Absolute Beginners\r
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Lets expand the repertoire of output that we can use by looking at the function analogWrite(). I experienced much confusion with analogWrite(), because I suspected that it had to do with the analog pins on the Arduino. The function, however, has nothing to do with the analog pins. There are 5 pins on most Arduino boards marked with an '~' next to the pin number - these pins can be invoked to rapidly change the power being applied at the pin - this is a technique called pulse width modulation (PWM).\r
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You Will Need\r
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LED - any color is fine\r
220 Ohm Resistor\r
Alligator Clip\r
Glacial ice cubes\r
Step-by-Step Instructions\r
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Take the short leg of your LED and stick it in the GND pin.\r
Take either leg of the resistor and place it in pin 9.\r
Connect the long leg of the LED with the other leg of the resistor using an alligator clip\r
Plug the Ardunio into your computer with the USB cable\r
Open up the Arduino IDE\r
Go to File, Examples, 01.Basics, Fade\r
Click the Verify button (Top Left). The button will turn orange and then blue once finished.\r
Click the Upload button. The button will turn orange and then blue when finished.\r
Watch in mesmerizing amazement as the LED fades in and out.\r
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The sketch starts with the usual multiline comment describing the sketch and how to set up the circuit. The first block of code we encounter is the declaration and initialization of 3 int variables...\r
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int led = 9; // the pin that the LED is attached to\r
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int brightness = 0; // how bright the LED is\r
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int fadeAmount = 5; // how many points to fade the LED by\r
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The variable names and comments are both descriptive and helpful - remember this when naming and commenting your own code - it is a pillar of success! The \"brightness\" variable will store the value of the current brightness of the LED. \"fadeAmount\" is the rate at which the LED will fade and brighten. And of course, as the comments explain, \"led\" is simply the pin number where we have attached our LED (through a 220 Ohm resistor).\r
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Now that we have declared and initialized our variables, we move on to setting up the board with the setup() function...\r
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void setup() {\r
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// declare pin 9 to be an output:\r
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pinMode(led, OUTPUT);\r
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}\r
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The only thing we do here is set the mode of pin 9 as an OUTPUT using the pinMode() function. Recall that pinMode() takes two arguments - the pin number and the mode. In this case we assign the pin number using our variable \"led\", which we previously initialized as the number 9. By now you know that setup() only runs once - the code inside the setup() curly bracket will only be executed a single time by the Arduino. Where the real action happens is in loop().\n
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Resource Details

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Media Length
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19:45
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Grade
Higher Ed
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Subjects
STEM
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Media Type
Instructional Videos
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Source:
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\nProgramming Electronics Academy\n\n
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Date
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2013
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Language
English
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Audiences
For Teacher Use
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Usage Permissions
Fine Print: Educational Use
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Concepts

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voltage, parentheses, variables, electronics
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Additional Tags

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arduino (computing platform), light-emitting diode (invention), how-to (media genre), learn, switchcase statement, introduction, microcontrollers, arduino course for absolute beginners, learning arduino, open source hardware group, leds, pinmode, outputs, void loop, void setup, tutorial electronics, arduino tutorial, programming, analogwrite, arduino (brand), tutorial (media genre), led, c++, c (programming language), programming for beginners, variable brightness, sodalis breadboard, duty cycle, curly brackets, digital pin, comparison operator, pin number, fade amount, analog pins, start adding, arduino board, analog rate, set equal, times negative, analog write, power output, loop function, amount, arduino, pin 9, fade, analog, board, write, adding, function, bright, loop
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