In Figure 1 shows the block diagram of our previous study. This system has a maximum detection distance of 6 meters and the sensing angle ranges between 0 to 180 degrees. However, the circuit implementation is complex and picks up large noise because of mixed circuit [6]. In this paper, a sensing module for standing and moving a human body using a chopping method was developed which consists of the following: a shutter, a Fresnel lens and PIR sensor [7]. The circuits and the control algorithm, which makes up the composition of the module was designed. Finally, the prototype was realized through experimental method, discussion of data, and results based on the proposed circuit’s performance.
The rest of this paper is organized as follows. Section 2 describes the operational principle and module configuration. Then, Section 3 discusses the experimental results. Finally, Section 4 concludes this paper.