The guidelines of autonomous electronic data logger device equipped with SD flash card storage system are described. Various micro power sources are proposed for implementation of autonomous work, as well as the problem of uninterruptable power supply are discussed and designed with combination of small Solar panel and Li-ion battery. Specific power management integrated circuits are described. In context of decreasing the power consumption of data logger system, the way of usage of microcontroller’s internal peripheral devices is described and software code is analyzed
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