Patent ID: 7832281

Claim:
A monitoring system comprising: a monitoring device including: a Micro-ElectroMechanical Systems (MEMS)-based sensing device configured to sense a property of at least one of: an area or an object, distinct from the sensing device, to which the monitoring device is affixed; a transmitter, distinct from the sensing device, configured to transmit a signal based on the property and an identity of the monitoring device, wherein the MEMS-based sensing device varies at least one of: a frequency, an amplitude, or a phase of the signal with the property, and wherein the signal is transmitted either continuously or periodically according to a set time period; a processing module configured to periodically switch between two states to adjust at least one of: the frequency, the amplitude, or the phase of the signal to identify the monitoring device; and a power module configured to provide power to the sensing device and the transmitter.