Use your Arduino to receive temperature and humidity data from TFA remote sensor.
https://github.com/denxhun/TFA433
https://github.com/denxhun/TFA433/wiki
There are several 433 MHz receiver available in many places. I used a cheap type and it works perfectly. You should use Arduino's interrupt enabled digital input pins (on Uno/Nano: D2 or D3) since this library built on top of that feature.
Use at your own risk! Truly! There is no warranty!
In the examples directory you can find a simple way of usage.
You can find a detailed description of the protocol here: https://manual.pilight.org/protocols/433.92/weather/tfa.html
Thanks for the reverse engineering the sensor's messages to pilight's dev team. The processing code is built on top of their excellent source - tailored for my special needs and limited environment.