Arduino sketches:

Setup on PC

For temperature and humidity sensor open Arduino IDE and install the DHTLib as a .zip file https://github.com/RobTillaart/DHTlib

Open command prompt to see results

Setup on Raspberry Pi for serial communication

if the .py programm does not work, run the following commands:

$ sudo adduser your_username dialout

$ python3 -m pip install pyserial

for checking the connection use:

$ ls /dev/tty*