Arduino Programming Basics (workshop #6)

Arduino Programming Basics (workshop #6)

• 1.
  THIRTY MINUTES TO MAKING: ARDUINO BASICS: PROGRAMMING
• 2.
  PARTS! (SAME ASLAST SESSION) • Arduino • Components (LEDs, resistors, etc.) • Your brain
• 3.
  ARDUINO CODE •Based upon C/C++ • Programs created and uploaded to the Arduino are called sketches. • Sketches can be created in notepad or other text editors.
• 4.
  LAST SESSION’S LESSON • We made an LED blink. • We turned it on, waited, and then turned it off. • Doing this fast enough made it appear to blink.
• 5.
  THIS SESSION? •We will work an array of blinking LEDs. • By controlling the order, the array appears to be sweeping. • We will start with explicitly turning each LED on and then off. • …then we will do the same with loops.
• 6.
  WHAT ARE LOOPS? • A loop performs a task repeatedly until a condition is met. • Some loops are based upon incrementing or decrementing a variable. • Remember, the base code in an Arduino sketch uses a loop – void loop()
• 7.
  FOR LOOP? •A FOR loop performs a task for as long as the condition is met. • Usually in the format: • Set a variable equal to some number. • Make sure the variable is less than (or greater than) another number. • Perform a mathematical operation (usually addition or subtraction) on the variable to change its value. • Start over.
• 8.
  A FOR LOOPLOOKS LIKE: • for(int i = 1; i < 10; i = i + 1){ repeated actions } • int i = 1 • Set the variable ‘i’ equal to 1. • You don’t have to use ‘i’ if you don’t want to do so. Choose one that makes sense to you, but be consistent. • i < 10 • We are only going to do the actions inside of the curly braces {} for as long as i is less than 10. • We will keep repeating these actions until i equals 9. • Once i equals 10, the loop stops before anything happens. • i = i + 1 • Once we have run through the loop with i equal to 1, we will start over with i equals 2.
• 9.
  WHY LOOPS? •Because we are lazy inherently efficient. • Type a short command many times -or-a medium command once. • Speaking of lazy: • i = i + 1 can be written i++ • i = i - 1 can be written i-- • (why press five buttons when three will do?) • Like this: For (int i = 1; i < 10; i++){}
• 10.
  SEE IT INACTION!
• 11.
  QUESTIONS?