Tilt detecting apparatus and method

摘要

An apparatus and method are disclosed for detecting whether a device has been tilted beyond a predefined threshold. A casing is included for temporarily enclosing a radio frequency identification (RFID) tag. The RFID tag is unable to receive an RFID interrogation signal when the RFID tag is enclosed in the casing. The tilting of the device is monitored. In response to the amount of tilt exceeding the predefined threshold, the RFID tag is exposed to radio frequency (RF) signals. The RFID tag receives the RFID interrogation signal when the RFID tag is exposed. The RFID tag transmits a reply RFID signal in response to a receipt by the RFID tag of the RFID interrogation signal. The RFID tag transmits the RFID reply signal only when the RFID tag is exposed which indicates that tilting of the device beyond the predefined threshold has occurred.