Raspberry Pi Forums

Hi,

I am new to Raspberry pi , My project is about measuring air constituents using the following sensors and then uploading it to a website .

BMP085(barometric Pressure) , MICS 5525 (CO constituent), MICS 2710 (NO2 Constituent), DHT22(digital Humidity and Temp sensor) .

I am going to connect these sensors and RPi using Cobbler Board interface . According to the sensors output analysis what kind of OS should i use. I found many OS variants on this portal.

I Would be happy to Know what kind of Circuit Connections can be used .

for an OS I can't see any reason not to use the default raspbian (but I'm not an expert on OS)

I wouldn't use a push-fit breadboard for a monitoring project, soldering your board together will give a much more reliable signal.

the BMP085(barometric Pressure) sensor connects to the i2c bus.
the MICS 5525 gives an analogue output so you will need a digital to analogue converter of some kind.
the MICS 2710 (NO2 Constituent) sensor also gives an analogue output.
the DHT22(digital Humidity and Temp sensor) gives a digital output but only once every 2 seconds. as you already need a digital to analogue converter you could consider using a analogue sensor for this for a better update time.

Digital to analogue converter - you need a minimum of 2 channels, maximum of 4 (unless using multiple of each type of sensor).
how good a sensor resolution do you want? 12 bit ADC should probably suffice for your needs.

I would recommend installing the adafruit WebIDE to make it easier to write your monitoring program, it probably already has the setup for two of your sensors so you would just have to integrate them and add the two Analogue sensor in.
(I find the webIDE very easy to use for programming, just a shame it doesn't work properly with tablets or smartphones yet).

+1

Everyone coming to the RPi for the first time should start with NOOBS/Raspbian. Because it is widest used and best supported.