Patent ID: 8736439

Claim:
A method of detecting bed-departure, comprising the following steps: having a user in bed wear a sock, which is embedded or mounted with a pressure sensor in the sole, and mounted with a microcontroller unit comprising a battery, a radio-frequency module, and a microcontroller connected to said pressure sensor, or placing a slipper or a shoe on the floor near a user's bed, wherein the slipper or shoe is embedded or mounted with a pressure sensor in the sole, and mounted with a microcontroller unit comprising a battery, a radio-frequency module, and a microcontroller connected to said pressure sensor; switching on said microcontroller unit to acquire a sensor output signal at a predetermined time interval; having said microcontroller compare the value of said sensor output signal with a predetermined threshold at said predetermined time interval; if said sensor output signal value is less than said threshold, having said microcontroller continue to acquire a new sensor output signal at the next time interval; if said sensor output signal value is equal or larger than said threshold, having said radio-frequency module transmit a radio-frequency signal to a separate monitoring unit; and having said monitoring unit generate an audible sound as an alert, once receiving said radio-frequency signal.