fig5

Figure 5. Sleep posture monitoring. (A) Illustration of sleep postures; (B) Photograph of the system circuit board; (C) Photograph of the system worn around the neck; (D) Photograph of the system; (E) Schematic diagram of the system architecture; (F) Signal plots of strain sensors and electrocardiogram during rotation in different directions during sleep; (G) Partial enlargement of ECG; (H) Partial enlargement of the strain sensor signal. ECG: Electrocardiogram; ADC: analog-to-digital converters; MCU: microcontroller unit.