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Button

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    Buttons can be used as basic digital inputs for Microcontrollers. This program keeps the LED1 on as long as the button is pressed press.

    Hardware

    • Arch Board
    • Grove - Button

    http://xiongyihui.github.io/archcookbook/figures/digital_input.png

    Software

    Import the following code to mbed online compiler

    #include "mbed.h"

DigitalOut led(LED1);    // Configure LED1 pin as output
DigitalIn button(P1_14); // Configure P1_14 pin as input

int main()
{
    while(1) {
        led.write(button.read());    /* read the state of input  pin P1_14 and write it to output port pin LED1*/
    }
}

    We use DigitalIn class to get the button's input. The button.read() function returns a value 1 if button is pressed and 0 if released. This value is written to LED1 using led.write().

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