用Tinkercad学arduino之按钮控制亮灯 下拉电阻

项目地址：https://www.tinkercad.com/things/fxAUiYvu7aG

/*
  Button
  Turns on and off a light emitting diode(LED)
  connected to digital  pin 13, when pressing a
  pushbutton attached to pin 2.

   The circuit:
  * LED attached from pin 13 to ground
  * pushbutton attached to pin 2 from +5V
  * 10K resistor attached to pin 2 from ground
  * Note: on most Arduinos there is already an LED
  on the board  attached to pin 13.

  created 2005  by DojoDave <http://www.0j0.org>

  modified 30 Aug 2011  by Tom Igoe

  This example code is in the public domain.
  http://www.arduino.cc/en/Tutorial/Button
*/

int buttonState = 0;

void setup()
{
  pinMode(2, INPUT);
  pinMode(13, OUTPUT);
}

void loop()
{
  // read the state of the pushbutton value
  buttonState = digitalRead(2);
  // check if pushbutton is pressed.  if it is, the
  // buttonState is HIGH
  if (buttonState == HIGH) {
    // turn LED on
    digitalWrite(13, HIGH);
  } else {
    // turn LED off
    digitalWrite(13, LOW);
  }
  delay(10); // Delay a little bit to improve simulation performance
}