Raspberry PI

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sudo apt-get update
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sudo apt-get upgrade
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sudo apt-get install nodejs npm

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curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash -
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sudo apt-get update && sudo apt-get upgrade
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sudo apt-get install build-essential

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enum WriteOptions {
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    NO_OPTIONS = 0,
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    HINT_MANY_WRITES_EXPECTED = 1,
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    NO_NULL_TERMINATION = 2,
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    PRESERVE_ASCII_NULL = 4,
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};

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enum WriteOptions {
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    NO_OPTIONS = 0,
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    HINT_MANY_WRITES_EXPECTED = 1,
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    NO_NULL_TERMINATION = 2,
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    PRESERVE_ASCII_NULL = 4,
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    REPLACE_INVALID_UTF8 = 0
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};

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sudo npm install -g onoff
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sudo npm install -g blynk-library

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export NODE_PATH=/usr/local/lib/node_modules
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blynk-client 715f8cafe95f4a91bae319d0376caa8c

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    var blynkLib = require('blynk-library');
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    var sensorLib = require('node-dht-sensor');
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    var AUTH = 'YOUR KEY HERE';
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    // Setup Blynk
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    var blynk = new blynkLib.Blynk(AUTH);
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    // Setup sensor, exit if failed
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    var sensorType = 11; // 11 for DHT11, 22 for DHT22 and AM2302
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    var sensorPin  = 4;  // The GPIO pin number for sensor signal
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    if (!sensorLib.initialize(sensorType, sensorPin)) {
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        console.warn('Failed to initialize sensor');
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        process.exit(1);
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    }
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    // Automatically update sensor value every 2 seconds
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    setInterval(function() {
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        var readout = sensorLib.read();
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        var temp = readout.temperature.toFixed(1);
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        var humidity = readout.humidity.toFixed(1);
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        blynk.virtualWrite(2, temp);
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        blynk.virtualWrite(3, temp);
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        blynk.virtualWrite(4, humidity);
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        console.log('Temperature:', temp + 'C');
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        console.log('Humidity:   ', humidity + '%');
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    }, 5000);

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sudo NODE_PATH=/usr/local/lib/node_modules node ./temp.js