DigitalIn

Table of Contents

  1. Hello World!
  2. API
  3. Interface
  4. Related

This content relates to a deprecated version of Mbed

Mbed 2 is now deprecated. For the latest version please see the Mbed OS documentation.

For the latest DigitalIn API, please see DigitalIn.

The DigitalIn interface is used to read the value of a digital input pin.

Any of the numbered mbed pins can be used as a DigitalIn.

Hello World!

Import program
DigitalIn_HelloWorld_Mbed - main.cpp

00001 #include "mbed.h"
00002  
00003 DigitalIn enable(p5);
00004 DigitalOut led(LED1);
00005  
00006 int main() {
00007     while(1) {
00008         if(enable) {
00009             led = !led;
00010         }
00011         wait(0.25);
00012     }
00013 }

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API

API summary

Import librarymbed

No documentation found.

Interface

The DigitalIn Interface can be used on any pin with a blue label.

The pin input is logic '0' for any voltage on the pin below 0.8v, and '1' for any voltage above 2.0v. By default, the DigitalIn is setup with an internal pull-down resistor.

/media/uploads/chris/pinout-thumbnails.jpg
See the Pinout page for more details

To handle an interrupt, see InterruptIn

Examples of logical functions

Boolean logic - NOT, AND, OR, XOR

#include "mbed.h"
 
DigitalIn a(p5);
DigitalIn b(p6);
DigitalOut z_not(LED1);
DigitalOut z_and(LED2);
DigitalOut z_or(LED3);
DigitalOut z_xor(LED4);
 
int main() {
    while(1) {
        z_not = !a;
        z_and = a && b;
        z_or = a || b;
        z_xor = a ^ b;
    }
}
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