@ayechan – do you have a specific problem or are you looking for general instructions? If you have a specific problem, please create a new topic with a detailed description of your setup and problem.
If you are looking for instructions, start by reading the sensor manual provided by Yosemitech. If possible, connect the sensor to you computer using an RS485 to USB adapter and the Yosemitech ModbusRunner software. (The software is here if you need it: https://github.com/EnviroDIY/YosemitechModbus/tree/master/utilities/WindowsSoftware.) After that, read the documentation for the Yosemitech Modbus library (https://github.com/EnviroDIY/YosemitechModbus). Then test out the examples in that library. If you come up with a problem on the way, please create a new topic with a detailed description of your setup and problem.