velib.js

#!/usr/local/bin/node
var http = require('http');
var exec = require('child_process').exec;
var url = 'http://api.citybik.es/velib.json';

// var lat = '48.8836694';
// var lon = '2.3736453';
var id = 19030;

command = '/home/pi/blink1-tool -m 100 --rgb 50,50,50';
exec(command, function (error, stdout, stderr) {
    if (error !== null) {
        console.log(stdout);
        process.exit(1);
    } else {
        getStatus();
    }
});

function getStatus() {

    var req = http.get(url, function(res){
        var responseText = '';
        res.on('data', function(data){
            responseText += data.toString();
        });
        res.on('end', function(){
            var data = JSON.parse(responseText);
            var available = 0;
            var color = '';
            var command = '';

            for (var i=0,l=data.length; i<l; i++) {
                if (data[i].number == id) {
                    available = data[i].bikes;
                }
            }

            console.log(available);
            if (available < 3) {
                color = "255,0,0";
            } if (available >= 3 && available < 6) {
                color = "255,204,51";
            } if (available >= 6) {
                color = "153,255,51";
            }
            command = '/home/pi/blink1-tool -m 100 --rgb ' + color;
            exec(command, function (error, stdout, stderr) {
                if (error !== null) {
                    console.log(stdout);
                }
            });
        });
    }).on('error', function(e){
        console.log(e.message);
    });

}