Button

• You can start with File > Examples > 02. Digital > Button, make these changes to the sketch,
  or you can copy/paste the code in the next section:

• • Look at the Arduino Kit you have for this workshop.
    Identify the pin numbers where the buttons are connected.
    Select one of the buttons to use for this exercise. 

  • From the previous exercise  Hello World - Blink an LED ,  remember the pin for one of the LEDs.

  • Then, change these statements in the sketch to  use the pins for your selected button and LED:
    
    const int buttonPin = 9;  // the number of the pushbutton pin
    const int ledPin = 16;    // the number of the LED pin

• Also, change:
    pinMode(buttonPin, INPUT);
    to
    pinMode(buttonPin, INPUT_PULLUP);   // Our Kit does not have a resistor connected to the button

Or:

• File > New

• Delete all the code

• Copy/paste this sketch, which is based on File > Examples > 02. Digital > Button

/*

  Button

  based on

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Button

*/

// constants won't change. They're used here to set pin numbers:

const int buttonPin = 9;  // the number of the pushbutton pin

const int ledPin = 16;    // the number of the LED pin

// variables will change:

int buttonState = 0;  // variable for reading the pushbutton status

void setup() {

  // initialize the LED pin as an output:

  pinMode(ledPin, OUTPUT);

  // initialize the pushbutton pin as an input:

  pinMode(buttonPin, INPUT_PULLUP);

}

void loop() {

  // read the state of the pushbutton value:

  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is LOW:

  if (buttonState == LOW) {

    // turn LED on:

    digitalWrite(ledPin, HIGH);

  } else {

    // turn LED off:

    digitalWrite(ledPin, LOW);

  }

}

Tools > Processor: ATMega32U5 (5V, 16Mhz)

Important! Be sure to select the 5V Processor!

(We are using 5 volt Pro Micros, not the 3.3 volt version.)

Otherwise, when you upload a sketch, you will "brick" the Pro Micro. 

Compile and Upload your sketch.
Does it work?

Change it to do something else with the buttons and LEDs.

• Reverse the function of the button -- press turns off the LED.

• Add the other two buttons and LEDs to the sketch.

• Use for ( ) to blink the LED 5 times when the button is pressed. Something like:
  for (i=0; i<4; i++) {
      // LED on
      delay(1000);  // wait one second
      // LED off
  }

• Your ideas?