Figure 2 shows the block diagram of the proposed sensing module for a standing and a moving human body using a shutter method. The block consists of a shutter, Fresnel lens, PIR sensor, interface IC, MCU, and a LED alarm. The detecting principle of a moving human body is same as the convention method. However, the detecting principle of a standing human body has two steps. First (normal states), the shutter always opens, PIR sensor detects a temperature of a moving human body. If the PIR sensor detects the human body’s temperature, the MCU outputs alarms, otherwise the shutter is always on an opened-state and MCU will not sound the alarm. While, the other step is the standing state that occurs after the detection of a moving human body. In this case, the MCU controls the algorithm of the shutter on opened-closed state alternately. This operation is analogous to the differential action characteristics of PIR sensor.