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  1. 27/10/2016

    Know How... 256: Arduino 101, Basic Input and Output

    Learn the basics of programming an Arduino with some simple input and output practice! Make an LED blink, and integrate some buttons!_01-HelloBlink // This is the Arduino version of "Hello World"// We're using a digital pin to power a 5V LED// Connect the "Long leg" of the LED to the digital pin and the short leg to GNDvoid setup() { pinMode(7, OUTPUT); // The first step is to tell the Arduino where we're going to connect the LED // "7" tells the pinMode function that we're connecting the positive led to digital pin 7 // "OUTPUT" tells the pinMode function that we're using the pin for output, not input}// Remember that the Arduino will loop the code inside of "loop()" continously void loop() { digitalWrite(7, HIGH); // Power-on Digital pin 7 delay(1000); // Wait 1000 ms digitalWrite(7, LOW); // Power-off Digital pin 7 delay(1000); // Wait 1000ms} ** Let's add some constants!_02-AdvancedBlink // This is the Arduino version of "Hello World"// We're using a digital pin to power a 5V LED// Connect the "Long leg" of the LED to the digital pin and the short leg to GND // Let's up our game a little// We're going to use the "define" function to set our digital pin as a constant at program start// This will make it easier to redefine what pin we'll use for our LED// We're also going to use a constant to set our delay period #define dpin 7#define wait 500 void setup(){ pinMode(dpin, OUTPUT); // The first step is to tell the Arduino where we're going to connect the LED // "7" tells the pinMode function that we're connecting the positive led to digital pin 7 // "OUTPUT" tells the pinMode function that we're using the pin for output, not input}// Remember that the Arduino will loop the code inside of "loop()" continously void loop() { digitalWrite(dpin, HIGH); // Power-on Digital pin 7 delay(wait); // Wait 1000 ms digitalWrite(dpin, LOW); // Power-off Digital pin 7 delay(wait); // Wait 1000ms} ** And now some functions! _03-BetterBlink // This is the Arduino version of "Hello World"// We're using a digital pin to power a 5V LED// Connect the "Long leg" of the LED to the digital pin and the short leg to GND // Know what? As long as we're getting crazy with super-simple programs, what about this?// Let's create a a function that gets called in "loop()" // We Removed the ""wait"" constant#define dpin 7 void setup(){ pinMode(dpin, OUTPUT); // The first step is to tell the Arduino where we're going to connect the LED // "7" tells the pinMode function that we're connecting the positive led to digital pin 7 // "OUTPUT" tells the pinMode function that we're using the pin for output, not input} // Remember that the Arduino will loop the code inside of "loop()" continously void blink(int on, int off){ digitalWrite(dpin, HIGH); delay(on); digitalWrite(dpin, LOW); delay(off);} void loop() { // We call the function, and pass it the wait parameters // The first parameter tells the function how long to keep the LED light on // The second parameter tell the function how long to keep the LED light off blink(2000, 500); } Now that we know how to push output, let's practice input! _04_Button // Using constants to define to which pin each button is connected #define buttonPin1 2 // This is the variable that stores the state of the buttonvoid{ These show notes have been truncated due to length. For the full show notes, visit https://twit.tv/shows/know-how/episodes/256 Hosts: Fr. Robert Ballecer, SJ and Bryan Burnett Sponsors: thetrackr.com promo code KNOWHOW braintreepayments.com/knowhow

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Dig into the TWiT.tv archives and enjoy episodes from ten years ago. It's a tech time machine! Please note that these episodes are from ten years ago, so URLs, products, and other information may be very outdated. Sponsor codes and offers may no longer be valid.

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