Arduino Uno Lesson 5 Digital Switch

Projects Programming
1

I am trying to use a single button/switch to turn an LED ON/OFF (like a light switch at home ) , but i am having trouble finding code that would execute that. Does anyone know how it could possibly work?

2

Here is the exactly what you want. Arduino - Button control LED

The code in that tutorial work not only for button but switch

3

you want the LED to toggle with each button press, right?

// recognize multiple button presses; tgl LED when pressed

byte butPin = A1;
byte ledPin = 10;

byte butLst;


// -----------------------------------------------------------------------------
void setup (void)
{
    digitalWrite (ledPin, HIGH);
    pinMode      (ledPin, OUTPUT);

    pinMode      (butPin, INPUT_PULLUP);
    butLst      = digitalRead (butPin);
}

// -----------------------------------------------------------------------------
void loop (void)
{
    byte but = digitalRead (butPin);

    if (butLst != but)  {
        butLst = but;

        if (LOW == but)     // button pressed
            digitalWrite (ledPin, ! digitalRead (ledPin));
    }

    delay (10);         // debounce
}
4

gcjr:
you want the LED to toggle with each button press, right?

// recognize multiple button presses; tgl LED when pressed

byte butPin = A1;
byte ledPin = 10;

byte butLst;

// -----------------------------------------------------------------------------
void setup (void)
{
    digitalWrite (ledPin, HIGH);
    pinMode      (ledPin, OUTPUT);

pinMode      (butPin, INPUT_PULLUP);
    butLst      = digitalRead (butPin);
}

// -----------------------------------------------------------------------------
void loop (void)
{
    byte but = digitalRead (butPin);

if (butLst != but)  {
        butLst = but;

if (LOW == but)    // button pressed
            digitalWrite (ledPin, ! digitalRead (ledPin));
    }

delay (10);        // debounce
}

thanks gcjr that totally worked !

5

@gcjr

the code you posted worked as I needed ! but would you mind explaining the code or providing some pseudocode to help me understand what is going on ? Im trying to learn Arduino so it would be of much help .

Anyone else is welcome to help explain btw !