in this paper, we design and present a novel real-time
sleeping position monitoring system. The sensing modules
composed of 3-axis accelerometers are placed on object’s
forehead and chest to monitor the object’s position during
sleeping by calculating the angles between gravity vector and its
three axes. System is driven by an inexpensive and low power
microcontroller. In this system, we implement a proposed novel
CORDIC-based algorithm on the embedded microcontroller so
that the system is capable of transferring the raw data of the
accelerometer from motion domain to angular domain in-line,
and the system can provide the inclination or tilt angle
information by itself in real-time. The sleeping position
information is integrated into polysomnography (PSG) to
cooperate the study of obstructive sleep apnea (OSA) syndrome.