Arduino button LED not working

Question

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.

Code:

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);
    }
}

a) Read stackoverflow.com/editing-help to learn how to format your code. b) Consider posting at Arduino — 001
– 001, Commented Feb 6, 2018 at 15:33

user2261062 · Accepted Answer · 2018-02-06 16:18:51Z

1

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

Otherwise use INPUT_PULLUP to use the Arduino internal pullup resistors

pinMode(BUTTON, INPUT_PULLUP);

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

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);
}

answered Feb 6, 2018 at 16:18

user2261062

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