实验材料

材料	数量
Wemos D1 mini	1块
按钮	1
LED	1块（可选，利用板载灯也可以）
杜邦线	若干

硬件连接图

在这里插入图片描述

源代码

/*
  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
*/

// constants won't change. They're used here to set pin numbers:
const int buttonPin = D4;     // 按钮信息读取引脚D4
const int ledPin =  LED_BUILTIN;      // 选择板载灯

// variables will change:
int buttonState = 0;         // 按钮开关状态标志位

void setup() {
  // 板载灯引脚设置为输出
  pinMode(ledPin, OUTPUT);
  // 按钮引脚设置为输出
  pinMode(buttonPin, INPUT);
}

void loop() {
  // 读取当前按钮状态标志位
  buttonState = digitalRead(buttonPin);

  // 判断按钮是否按下. 如果按下，按钮应为HIGH（取决于硬件电路的连接方式）
  if (buttonState == HIGH) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
  } else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
  }
}