Weather station via Raspberry Pi, which is better to do - via Arduino or via Raspberry Pi GPIO?

Question

Arduino

Hello dear readers of this issue!
I have a very big question for you.
To begin with, I will tell you what is required from a "weather station":
1. Connecting photoresistors (using a breadboard) to check the light (On - Off)
2. Water temperature (using a thermometer, respectively)
3. Water pH (using a pH meter)
4 turn on and off the lamps and the pump (using the button on the raspberry pie)
5. Make an interactive application .exe or .cfg
There are two ideas how to do this:
1. sensor - arduino - raspberry - application (possibly web)
2. sensor - raspberry - app (maybe web)

Answer 1

Sensor - raspberry - application. No need for Arduino. We take sensors with i2c, look for python modules, write simple software. We hang relays or transistors on gpio. For beautiful visualization, you can use grafana, I did prometheus + grafana, I wrote exporters myself, there is something on github.

Answer 2

You forgot the third possible option - without raspberries. Especially if you take ESP instead of the classic arduino.

Answer 3

I made a block based on the Wemos D1 mini (ESP-8266) arduino-like controller. All content is generated on the client by js, I just uploaded the application to flash(4mb). Design https://purecss.io + reactive content https://mithril.js.org , after compressing the files, the whole application took less than 2mb.