fig9

Figure 9. (A) Multi-channel data acquisition system for sleep state monitoring. One pixel corresponds to one TENG unit with a pressure sensitivity of 0.77 V·Pa^-1; (B) The UI showing sleep states information including posture, position, and pressure distribution; (C) The diagram showing the press number distribution of a sleeper throughout the night; (D) Automatic warning function of smart bedsheet; (E) Auxiliary warning function of smart bedsheet^[42]. Reprinted with permission. Copyright 2017, John Wiley and Sons; (F) Schematic illustration of a smart bedsheet integrated functional fibers with a high sensitivity of 10.79 mV·Pa^-1; (G) Design of an integrated system containing sensing array, signal amplifiers, multi-channel processing, ADC, Bluetooth transmitter, and mobile terminal; (H) The flowchart of the obstructive sleep apnea-hypopnea syndrome monitoring and intervention system; (I) Photograph showing the patient is awakened by the system in abnormal situations^[243]. Reprinted with permission. Copyright 2020, Elsevier. TENG: Triboelectric nanogenerator; UI: user interface; ADC: analog-to-digital converters.