Node.js script to read DHT22 sensor and post readings to API. Run in background with forever / forever-service node libraries.

sensors.js

/***
forever-service version 0.5.4

Platform - Raspbian GNU/Linux 7 (wheezy)
update-rc.d: using dependency based boot sequencing
sensors provisioned successfully

Commands to interact with service sensors
Start   - "sudo service sensors start"
Stop    - "sudo service sensors stop"
Status  - "sudo service sensors status"
Restart - "sudo service sensors restart"
***/

var sensorLib = require('node-dht-sensor');
var unirest = require('unirest');
var apiHost = "https://yourapiurlhere/api/v1/";

function getFahr(tempC) {
    var p = Math.pow(10, 1);
    tempF = tempC * 9 / 5 + 32;
    return Math.round(tempF * p) / p;
}

function apiPost(tempC, humidity) {
    unirest.post(apiHost + 'syour_sensor_endpoint')
        .type('json')
        .headers({
            'Accept': 'application/json',
            'Authorization': 'Token token=yourapitokenhere'
        })
        .send({
            sensor_reading: {
                temp_c: tempC,
                temp_f: getFahr(tempC),
                humidity: humidity
            }
        })
        .end(function (response) {
        console.log(response.body);
    });
}

var dht_sensor = {
    initialize: function () {
        return sensorLib.initialize(22, 4);
    },
    read: function () {
        var readout = sensorLib.read();
        apiPost(readout.temperature.toFixed(2), readout.humidity.toFixed(2));
        console.log('Temperature: ' + readout.temperature.toFixed(2) + 'C, ' +
            'humidity: ' + readout.humidity.toFixed(2) + '%');
        setTimeout(function () {
            dht_sensor.read();
        }, 1200000);
    }
};

if (dht_sensor.initialize()) {
    dht_sensor.read();
} else {
    console.warn('Failed to initialize sensor');
}