Is there a way to only record measurements during the daytime and put a CR200X-series datalogger in sleep mode during the nighttime to conserve power?

Yes. The simplest method is to use conditional program statements that execute most of the code based on time. For example, the data could be scheduled to log at 6 a.m. and finish at 8 p.m. using CRBasic instructions such as IfTime(). Another option is to use an IfThen/EndIf construction that does a logical test of light-level measurements based on a light sensor. An additional option is to use calculated sunrise and sunset times along with a combination of RealTime() and Case instructions.

For more information, see the “Decisions, Decisions, Decisions…” article. 

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