Arduino 按钮 LED 不工作 [英] Arduino button LED not working

问题描述

当我按下按钮时它会关闭 KY008，但当我再次点击它时它不会关闭它，但是如果我稍微摇晃激光二极管，KY008 会重新打开.

When I push the button it turns the KY008 off but when I click it again it won't turn it off, but if I jiggle the Laser Diode a little bit the KY008 turns back on.

代码:

int LED = 12;
int BUTTON = 4;

void setup(){
   pinMode(LED,OUTPUT);
   pinMode(BUTTON,INPUT);
}

void loop(){
    if(digitalRead(BUTTON) == HIGH){
        digitalWrite(LED,HIGH);
    }else{ 
    digitalWrite(LED,LOW);
    }
}

推荐答案

如果使用 INPUT，则需要有一个物理上拉(或下拉)电阻(通常为 10k).

If you use INPUT you need to have a physical pullup (or pulldown) resistor (typically 10k).

否则使用INPUT_PULLUP来使用Arduino内部上拉电阻

Otherwise use INPUT_PULLUP to use the Arduino internal pullup resistors

pinMode(BUTTON, INPUT_PULLUP);

确保您的按钮在按下时将电路闭合到地.

Make sure that your button closes the circuit to ground when pressed.

此外，在阅读按钮时，您会有很多弹跳.防止弹跳的最简单方法是在读取之间添加延迟.

Also when reading a button you will have a lot of bouncing. The easiest way to prevent the bouncing is to add a delay between reads.

void loop(){
    if(digitalRead(BUTTON) == HIGH){
        digitalWrite(LED,HIGH);
    }else{ 
        digitalWrite(LED,LOW);
    }
    delay(100);
}

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