[zitoune]

Wise decision. According to the sensor datasheet the fan consumption is 140mA and the maximum current you can drain from an Arduino nano pin is 20mA.

Yes indeed

I'm thinking in ordering one DN7C3CA006 for myself, I found some sellers on eBay. Do you bought yours on eBay?

I found mine at digikey - it seems cheaper (30 USD) than those I found on eBay (and it's very fast shipping). However you will need to order for a certain minimum to get free shipping. In Singapore it's about 130 USD so a fair amount to spend, but ebay would do for sure.

I still haven't fully figured in my mind how to integrate it. The better and more efficient way will be create a dedicated RF unit, sending a new sensor ID info. Integrate the sensor on the existing TX units, may not be as easy as it seems at first sight.
With time, something will come out...

I tries also to figure out a few possibilities:

I looked a bit at the code and was wondering if there was still some byte available in the radio transmitted signal from the TX to the RX? Or if it was fully used by other sensors? As first sight seems like we cannot do that.

Would it be a possibility to use the Leaf/Soil Interface? I thought we could build the same amplifier unit as for the solar/UV to amplify the signal from a theoretical maximum of around 0.8V (according to the term sheet) to 5V (or 1.1V)?

Last idea, suggested by uncle_bob: use one LCD to display the value and have it running autonomously from the weatherduino.
In my case I can see the RX enclosure without going outside, so would not be a problem, but for most it would mean a different enclosure. Also it would mean no integration to weatherduino - what a pity

Regards.