Hi All,
i'm new on this forum, so please excuse me if this is not the right place where to post this topic. I've searched the best one in my opinion.
I would like to create a very very small ambient interface sensor that could be interfaced over Ethernet, to be placed in all my rooms.
I don't want to use wifi solutions and I would like to use an ethernet connection with a passive POE running with with an industrial 24Vdc power supply, so only one Cat5e cable will be required.
I was thinking to use arduino nano + an ethernet shield with a RJ45 connector (like this Ethernet w/ MicroSD add-on for Arduino Nano) + a DC/Dc converter (from 24v to the required for Arduino) + an I2C sensor like this Adafruit BME280 I2C or SPI Temperature Humidity Pressure Sensor [STEMMA QT] : ID 2652 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
anyway i would need to hack the ethernet cable close to my new device in order to separate the power supply wires and route them to the dc/dc converter.
does anyone of you know if there's a component like this already on the market (at least already packaged 
) or do you have some other idea/suggestion to get temperature/humidity (and maybe CO2) over ethernet using a very small device?
thanks in advance for any comment
simone