Tut 1

button_light.ino

 // the input pin where the // pushbutton is connected


void button_light()
{
  val = digitalRead(BUTTON); // read input value and store it
 // check if there was a transition
if ((val == HIGH) && (old_val == LOW)) // when ever there is a change in state from button pressed
{ 
  state = 1 - state;
  delay(10); // delays before moving on in the code
}
old_val = val; // val is now old, let's store it

if (state == 1) 
{
digitalWrite(LED, HIGH); // turn LED ON
}
else
{ digitalWrite(LED, LOW); // turn off led
}
}

change_lights.ino

void change_lights()
{
  val = digitalRead(BUTTON); // read input value and store it
 // check if there was a transition
if ((val == HIGH) && (old_val == LOW) )
{ 
  state = 1 - state;
  delay(10);
}
old_val = val; // val is now old, let's store it

if (state == 1) 
{
digitalWrite(LED, HIGH); // turn LED1 ON
digitalWrite(LED2, LOW); // turn LED2 off
}
else
{ 
  digitalWrite(LED, LOW); // turn LED1 off
  digitalWrite(LED2, HIGH); // turn LED2 ON
}
}

flashing_light.ino

void flashing_light()
{
  digitalWrite(LED, HIGH); // turn on led
  delay(1000); // time that it is on
  digitalWrite(LED, LOW); // turns off led
  delay(1000); // time that is off
}

tut1.ino

const int LED = 13; // LED connected to  pin 13
const int LED2 = 12;
const int BUTTON = 7;
int val=0; // val will be used to store the state // of the input pin
int old_val = 0; // this variable stores the previous // value of "val"
int state = 0; // 0 = LED off and 1 = LED on
void setup() {
  pinMode(LED, OUTPUT); // sets the led is an output source
  pinMode(BUTTON, INPUT); // and BUTTON is an input
pinMode(LED2, OUTPUT);
} void loop() {
  
//  flashing_light(); // goes to function of this name
  //button_light();  // goes to function of this name
 change_lights();  // goes to function of this name
}