Puzzle: Is The Arduino Language Object-Oriented?

The basic Arduino Language looks rather procedural according to the references.

But it does supports Libraries which are clearly classes, as shown by the syntax for using libraries, and the documentation for creating your own Libraries.

Buying some shields

I have just purchased:

1USB Host Controller

DC Motor Driver Shield

Prototyping Shield

4 x DS18B20 Temperature Sensor breakout boards

40A/240Vac Solid state relay

RTC breakout board

The intent is to get some code running for controlling AC and DC fans

A Source of 1-Wire Products

HobbyBoards

The Humidity/Temperature/Solar board seems to fit in with out sensor requirements.

As does the 8 channel relay board at 2A/240Vac.

How to make a custom enclosure.

There are some plastic boxes designed for Arduino but you might find this 3D printing service from SparkFun interesting.