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Button

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().

More information of DigitalIn can be found at mbed handbook.

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