Use mraa kit to control GPIO

Aim

In this section, we are going to use mraa to control GPIO.

Note: The LED lights to be controlled in this example is the same as wifi one on the board.

Controlling LED (outputting GPIO messages)

Steps

• ssh into Linkit Smart 7688.

• Generate a project.

    > mkdir app
  

• Use npm to initialize your project.

    > npm init
  

• Generate an app.’s file.

    > vim app.js
  

• Enter the content in app.js.

var m = require('mraa');
var ledState = true;
var myLed = new m.Gpio(44);

myLed.dir(m.DIR_OUT);

function periodicActivity() {
    myLed.write(ledState ? 1 : 0);
    ledState = !ledState;
    setTimeout(periodicActivity, 1000);
}
periodicActivity();

• Then, we can see the results!