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The STM32F103C6T6A, also called the "Blue Pill" is a low-cost machine with 32-bit ARM Cortex-M3 RISC core designed by STMicroelectronics for beginners to build and test prototypes [8]. It is intended ...

Current crowdsensing techniques are limited to two-dimensional positioning, which restricts their accuracy and applicability in complex environments. This paper introduces a novel three-dimensional ...