Hi I am NIck,
I am fairly new to the arduino environment, so I need some help on connecting multiple sensors on the single arduino board.
I have searched it online but couldn’t find the stuff I wanted. If somebody could help me would be very much appreciated.
I just bought three HIH4030 humidity sensors from the sparkfun but wondering how to connect the 5V output to three of these sensors to get humidity input.
I know all sensors ground will go common to arduino ground.
Very excited to hear back!!
Thank you,
NIck
The basics of what you want is that each sensor will tie to a common power (5V) and to a common ground. These power and ground rails need to be common with the Arduino’s 5V and ground as well. Each sensor’s ‘sense’ line will go to a separate analog-in pin on the Arduino. Your code now will read each ADC in turn, convert to humidity and do with that number what you will.
Now since measuring the humidity of the given same environment with three sensors seems to me to be a waste of time (humidity does not vary much from point to point) and that the time constant on these sensors is pretty long (5 seconds) then the possibility that you plan to use these sensors on long cables must be considered. Noise from unshielded cables could swamp your signal. You will need to use a good multiconductor with shield cable. A good security, or plenum HVAC cable might fit the bill.