adding SI7021 sensors to pixhawk's I2C

Hello guys.. i have a plan to adding SI7021 humidity & temperature to my own pixhawk, data transfer via telemetry 433MHz. so we can make any interface on PC to read the sensor's data. would you give me suggest what should i do first? or any tutorials / forum's discuss i can read? should i make SI7021's library first then editing the pixhawk main code?

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