user3970: I'm looking for an Arduino board that include this sensors out of the box:

CO2
Humidity
Noise
Temperature

I've found here Using the Waspmote Sensor Board something that could be enough, but I'm searching for more options.
I did a lot of searches on the Internet without good results.
Any suggestions?

user24376: For humidity and temperature you can plug the DHT11 or DHT22 to your arduino. DHT11 is cheaper but you'll get a more precise value with DHT22.
For noise you have ready made PCB like these : here
You'll only have to plug it to GND, 5V and analog input.
For CO2 this is more complicate. There is a cheap but very unprecise option, using a MQ135 sensor, here is a tutorial: here
Otherwise there are better sensors like the K30 but they are much more expensive.

3970: <p>I'm looking for an Arduino board that include this sensors out of the box:</p>

<ul>
<li>CO<sub>2</sub></li>
<li>Humidity</li>
<li>Noise</li>
<li>Temperature</li>
</ul>

<p>I've found here <a href="https://arduino.stackexchange.com/questions/269/using-the-waspmote-sensor-board">Using the Waspmote Sensor Board</a> something that could be enough, but I'm searching for more options.</p>

<p>I did a lot of searches on the Internet without good results.</p>

<p>Any suggestions?</p>
 24376: <p>For humidity and temperature you can plug the DHT11 or DHT22 to your arduino. DHT11 is cheaper but you'll get a more precise value with DHT22.</p>

<p>For noise you have ready made PCB like these : <a href="http://www.ebay.com/sch/items/?_nkw=arduino%20sound%20sensor&amp;_sacat=&amp;_ex_kw=&amp;_mPrRngCbx=1&amp;_udlo=&amp;_udhi=&amp;_sop=12&amp;_fpos=&amp;_fspt=1&amp;_sadis=&amp;LH_CAds=&amp;rmvSB=true" rel="nofollow">here</a>
You'll only have to plug it to GND, 5V and analog input.</p>

<p>For CO2 this is more complicate. There is a cheap but very unprecise option, using a MQ135 sensor, here is a tutorial: <a href="https://hackaday.io/project/3475-sniffing-trinket/log/12363-mq135-arduino-library" rel="nofollow">here</a>
Otherwise there are better sensors like the <a href="http://www.co2meter.com/products/k-30-co2-sensor-module" rel="nofollow">K30</a> but they are much more expensive.</p>
