The great thing about development these days is that there is a library for everything. I could not find an Arduino library for Sensirion's STS-30 temperature sensors, which i am using for a project (with Arduino M0). I modified the STH-library, which ìs available on the Sensiron GitHub. To top it all off, the example also includes an additional I2C on pins 2 and 3. The STS library for Arduino is available on: My Github.