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DigitalOut

Table of Contents

  1. Hello World!
  2. API
  3. Interface
  4. Details
  5. Examples

/media/uploads/mbedofficial/digitalout_interfaces.png

The DigitalOut interface is used to configure and control a digital output pin.

Hello World!

Flash an LED

#include "mbed.h"

DigitalOut myled(LED1);

int main() {
    while(1) {
        myled = 1;
        wait(0.25);
        myled = 0;
        wait(0.25);
    }
}

API

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Interface

The DigitalOut Interface can be used on mbed pins p5-p30, and also on-board LED1-LED4

The DigitalOut Interface can be used to set the state of the output pin, and also read back the current output state. Set the DigitalOut to zero to turn it off, or 1 to turn it on.

Details

The pin output is 0v and 3.3v (0 and 1), and can source or sink a maximum of 40mA.

Examples

Alternative flashing

#include "mbed.h"

DigitalOut myled(LED1);

int main() {
    while(1) {
        myled = !myled;
        wait(0.25);
    }
}

Alternative flashing

#include "mbed.h"

DigitalOut red(p5);
DigitalOut green(p6);
DigitalOut blue(p7);

int main() {
    // red
    red = 1;
    green = blue = 0;
    wait(1);
    
    // green
    green = 1;
    red = blue = 0;
    wait(1);

    // white
    red = green = blue = 1;
}
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