materiales:
arduino uno con IDE (compilador de codigos de arduino) instalado en su computadora
3 led (color a preferencia del usuario)
protoboard
3 resistencias de 220 ohms
pulsador normalmente abierto o microswitch
cables jumper e diferentes colores y tamaños
el diagrama es el siguiente:
y el codigo de muestra a continuacion:
 Parts required:
 1 green LED
 2 red LEDs
 pushbutton
 10 kilohm resistor
 3 220 ohm resistors
*/
// Create a global variable to hold the
// state of the switch. This variable is persistent
// throughout the program. Whenever you refer to
// switchState, you’re talking about the number it holds
int switchstate = 0;
void setup() {
  // declare the LED pins as outputs
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  // declare the switch pin as an input
  pinMode(2, INPUT);
}
void loop() {
  // read the value of the switch
  // digitalRead() checks to see if there is voltage
  // on the pin or not
  switchstate = digitalRead(2);
  // if the button is not pressed
  // blink the red LEDs
  if (switchstate == LOW) {
    digitalWrite(3, HIGH); // turn the green LED on pin 3 on
    digitalWrite(4, LOW);  // turn the red LED on pin 4 off
    digitalWrite(5, LOW);  // turn the red LED on pin 5 off
  }
  // this else is part of the above if() statement.
  // if the switch is not LOW (the button is pressed)
  // the code below will run
  else {
    digitalWrite(3, LOW);  // turn the green LED on pin 3 off
    digitalWrite(4, LOW);  // turn the red LED on pin 4 off
    digitalWrite(5, HIGH); // turn the red LED on pin 5 on
    // wait for a quarter second before changing the light
    delay(250);
    digitalWrite(4, HIGH); // turn the red LED on pin 4 on
    digitalWrite(5, LOW);  // turn the red LED on pin 5 off
    // wait for a quarter second before changing the light
    delay(250);
  }
}

 
+18.54.31.jpg)

