Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cheap and versatile humidity regulator for environmentally controlled
  experiments   The control of environmental conditions is crucial in many experimental work
across scientific domains. In this technical note, we present how to realize a
cheap humidity regulator based on a PID controller driven by an Arduino
microcontroller. We argue our choices on the components and we show that the
presented designs can serve as a basis to the reader for the realization of
humidity regulators with specific requirements and experimental constraints.

15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc