Patent ID: 8199008

Claim:
A personal alarm system, comprising: an input unit comprising a setting button; an output unit comprising an alarm and a display screen; a sensor to sense operations of the personal alarm system and output sense signals; and a control unit connected to the input unit, the output unit, and the sensor, and comprising a clock circuit and a control chip, wherein the control chip comprises a processor and a memory connected to the processor, the memory comprising a plurality of modules each of which stores one or more computerized instructions which the processor executes, the plurality of modules comprises: an alarm setting module to receive a time to sound the alarm by pressing the setting button and a condition to stop the alarm from sounding, and control to sound the alarm in response to the time to sound the alarm timed by the time circuit being reached; a calculation module to receive the sense signals from the sensor, and calculate a sum of the sense signals to obtain number of operations of the personal alarm system; and a determining module to determine whether the sum of the sense signals meets the condition to stop the alarm from sounding, and stop the alarm from sounding in response to the sum of the sense signals meeting the condition.