Arduino animatronics- make your awesome costumes more awesome!

Step 6 Using buttons

Example 2- Using a button input

This is just like the previous example but now the code runs only once after pushing a button. The push button uses a pull down resistor so when the button is pushed the input pin reads HIGH, otherwise it always reads LOW.

Copy and paste this sketch into your Arduino window-

/*
* Example 2
* LED Control using button input
* This example will blink two LEDs and fade another LED when a button is pressed and released
* Honus 2010
* Modified from Adafruit alternating switch code, http://www.adafruit.com
*/
 
 int ledPin1 = 13;  // control pin for LED 
 int ledPin2 = 12;
 int ledPin3 = 11;

int buttonPin = 14; // button is connected to pin 14 (analog in pin 0)
int val; // variable for reading the pin status
int buttonState; // variable to hold the last button state

void setup() {
  pinMode(buttonPin, INPUT);  // set the button pin as input

  Serial.begin(9600);  // set up serial communication at 9600bps
  buttonState = digitalRead(buttonPin); // read the initial state
 
   pinMode(ledPin1, OUTPUT);  // sets the LED pin as output
   pinMode(ledPin2, OUTPUT);
  
}


void loop(){
  val = digitalRead(buttonPin);  // read input value and store it in val

  if (val != buttonState) {  // the button state has changed!
    if (val == LOW) {  // check if the button is pressed
      Serial.println("button pressed");
     
   digitalWrite(ledPin1, HIGH);  // sets the LED pin HIGH (turns it on)
   delay(500);                    // waits 500 milliseconds
   digitalWrite(ledPin2, HIGH);
   delay(500);
   digitalWrite(ledPin1, LOW); // sets the LED pin LOW (turns it off)
   delay(500);
   digitalWrite(ledPin2, LOW);
   delay(500);
 
  
   // fade in from min to max in increments of 5 points:
  for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) {
    // sets the value (range from 0 to 255):
    analogWrite(ledPin3, fadeValue);        
    // wait for 30 milliseconds to see the dimming effect   
    delay(40);                           
  }

  // fade out from max to min in increments of 5 points:
  for(int fadeValue = 255 ; fadeValue >= 0; fadeValue -=5) {
    // sets the value (range from 0 to 255):
    analogWrite(ledPin3, fadeValue);        
    // wait for 30 milliseconds to see the dimming effect   
    delay(40);                           
  }
    } else {  // the button is -not- pressed...
      Serial.println("button released");
       digitalWrite(ledPin1, LOW);  // turn the LED off
       digitalWrite(ledPin2, LOW);
    }
  }

  buttonState = val;  // save the new state in our variable
}