Connect the RP2040 Adalogger to the DS3231 clock (if you are using one), and then the other port on the DS3231 to the SHT45 using STEMMA QT Cables. You can use either port on the DS3231 and SHT45 for input or output. The circuit will work whether you have the SHT45 or the DS3231 first in the chain. However, I found it a bit easier to position the hardware for accurate temperature monitoring if the SHT45 is last in the chain.

The cables should push snugly into place. they only go in one way around, so if they're not going in, try rotating them.

The circuit should look like this if you have a clock:

Or this if you don't:

Protecting the hardware

In this project, we're working with food and electronics and we want to be a bit careful to keep the two separate. At the same time, we need the sensor to be exposed so that it can fully sense the environment. The best setup here depends on what your bread proofing setup looks like. 

In many cases, you should be fine placing your electronics next to the bowl or basket you're proofing your dough in.

If you're proofing dough on a metal baking sheet, be careful to to place the electronics in contact with anything conductive.

With everything together, you're now ready to install the firmware.