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  • Only for playing

    posted by BadAngel on 06/19/2012

    Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week


    For this price you get a funny digital sensor. Copy and paste the code found on the internet, and you will get a serial or USB temperature and humidity sensor.
    Connect your arduino to a raspberry pi, make it send the results through SNMP and your cacti server will be able to monitor humidity and temperature in your room :)
    => only 4 hours of work to make it working !


    After the firsts moments being excited, I noticed two major problems:
    - temperature and humidity are ALWAYS integer numbers: it's not really a problem for humidity, but temperature is not enough precise. I used to work with LM35Z sensors and Dallas DS1820: those were so precise that I was able to see if someone entered the room, or if a computer was left working.
    - temperature is really not accurate: I was surprised to have "24°C" in my computer room (15 cores in 6 square meters ...), instead of 27°C. I verified with 4 different thermometers: all were agree on 27°C !

    On the other side the humidity sensor is really funny, and looks accurate (I do not have any way to check its accurancy).


    I insist: you should only consider the "humidity" part of this sensor, as LM35Z and DS1820 are REALLY more accurate (0.01°C to 0.1°C).
    By the way it's the cheapest humidity sensor I ever found for the moment, and this point should be considered.


    I bought this sensor to prototype an SNMP sensor an arduino and a Raspberry PI: I was able to validate the process in 4 hours: from the sensor wiring to the cacti configuration.

    • DHT11 to Cacti schema

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