抢答器

当按键按下时，数字10、9、8接口可读出为高电平，这时我们使数字7、6、5口输出高电平可使小灯亮起，程序中我们判断数字10、9、8口是否为低电平，要为低电平使数字7、6、5口输出也为低电平，小灯不亮。

原理图

实物连接图

程序代码

int redled = 10;
int yellowled = 9;
int greenled = 8;
int redpin = 7;
int yellowpin = 6;
int greenpin = 5;
int red;
int yellow;
int green;
void setup()
{
  pinMode(redled, OUTPUT);
  pinMode(yellowled, OUTPUT);
  pinMode(greenled, OUTPUT);
  pinMode(redpin, INPUT);
  pinMode(yellowpin, INPUT);
  pinMode(greenpin, INPUT);
}
void loop()
{
  red = digitalRead(redpin);
  if (red == LOW)
  {
    digitalWrite(redled, LOW);
  }
  else
  {
    digitalWrite(redled, HIGH);
  }
  yellow = digitalRead(yellowpin);  
  if (yellow == LOW)
  {
    digitalWrite(yellowled, LOW);
  }
  else
  {
    digitalWrite(yellowled, HIGH);
  }
  green = digitalRead(greenpin);
  if (green == LOW)
  {
    digitalWrite(greenled, LOW);
  }
  else
  {
    digitalWrite(greenled, HIGH);
  }
}

发布时间：2019/7/6 下午9:13:11  阅读次数：2474