Arduino Data Logger using MongoDB Database 

Are you using the old Arduino Uno R3 model? Yes the same pattern as in here but you may need an ESP8266 ESP-01 to send the data to the internet.

@@DonskyTech Hey, yes I'm using Uno R3. I've found a solution to my problem after writing that comment. I made a simple Python program which reads my serial data from COM in a form like a, b, c, d (temp and humidity) because I use two DHT22 sensors for outside and inside unit. Each time after I recieve data (let's say 10 seconds) it will put it in MongoDB Atlas database automatically.

@@hawk_bl Hey glad you have figured it out. Happy exploring!

@@hawk_bl can you please provide me the python program?

@@DonskyTech If I send sensor reading to my backend, through HTTP requests, is there any problem?