Sensor wiring, maximum distance?

Hi,

I'm new to the whole Arduino experience. I have a project in mind to do remote monitoring of some environmental properties (humidity, temperature). However, I was wondering if there is a limit to the distance between your sensor and the arduino board.

I would love to wire things up using cat-5 cable (or similar) and keep the arduino at a considerable distance from the actual sensors. But, I'm not sure if this is possible or that I should look into other (wireless) solutions if it's not.

Best, Koen

I was wondering if there is a limit to the distance between your sensor and the arduino board

Of course there is. What are your requirements? Depending on the protocols you use, the wired distance can range from 10 feet to thousands of feet...

Well,

I'm considering using this temperature/humidy sensor.

http://www.sensirion.com/en/01_humidity_sensors/02_humidity_sensor_sht11.htm

a CO2 sensor

http://www.futurlec.com/CO2_Sensor.shtml

and an Ozone sensor

http://www.futurlec.com/Ozone_Gas_Sensor.shtml

Initial development will be done on breadboard so distance won't be an issue. However, later on I would like to move both sensors and arduino into proper housing connecting them both with cat-5 cable. Initial distance would be something in the range of 2-3 meters. But it could become more in the future.

However, I was wondering that it might be easier to weatherproof the box containing the arduino setup and using an ethernet connection to get my measurements to where I want them to go (either a local computer or directly across the web to another server).

It would be easier to waterproof the housing.....and you should consider using bluetooth..instead of Ethernet....unless the distance is to great, or you will be doing this through a think wall...and if you really wanted to get creative you could try to use wireless internet....this could become tricky though.