Week 5 - Testing the Whole System

In week 5, the project has almost finished. So the main task of this week is to testing the system more times and to find the existing mistakes. It should be noted that the poster is already done, which can be seen in Figure 1.

Figure 1: The Poster

During the testing, the detecting distance of PIR was set from 1 to 3 meters. When a tester was passing by the circuit, the sensors would react and LED screen will show the figures. When another tester who is thinner passing by will cause different results. Here are the pictures showing the process of the testing and the consequent waveform from oscilloscope.

Figure 2: 100cm

Figure 3：150cm

Figure 4: 200cm

Figure 5: 250cm

Figure 6: 300cm

In addition, our group have built three identical circuits to test the movements of people falling down. The basic theory is that when people fall down, only the sensor at the bottom will receive the signal. At the same time, when a person walks through the system, all the three PIR sensors will detect the infrared to enable the circuit to respond. Therefore, the LED will show the man is walking. If the tester is sitting, only two lower sensors can detect the motions. And the LED will display the sitting status. The above two different conditions can help us judge whether someone falls down. However, this is the theoretical analysis and the actual test will be deviant from the theory. The two detection distance is different. Therefore, the final results are not very accurate. The procedure of the testing was recorded and they are shown below.

As it is shown in videos, the project has been achieved after 5-week effort. It is a satisfying result.