(node.js on beagle board) enables usr1-LED

beagle_rw_usr1.js

//  beagle board
// change trigger usr1-LED
var fs = require('fs');

function led_read() {
    fs.readFile('/sys/class/leds/beagleboard::usr1/trigger', 'utf-8',
    function(err,data) {
        if (err) {
            return console.log(err);
        } else {
            console.log(data);
        }
    });
}

function led_write() {
    fs.writeFile('/sys/class/leds/beagleboard::usr1/trigger', 'heartbeat',
    function(err) {
        if (err) {
            return console.log(err);
        } else {
            // read usr1 led
            led_read();
        }
    });
}

console.log('1----\n');
led_read();
led_write();
console.log('2----\n');