Here are http://projectaboutinfraredsensor.blogspot.co.uk it is a link of our group project's blog. Our project title is "infrared sensor in human's life" by boyue ju, xiaokai nie and adam, supervised by Dr yan.
This project asks the group to test the infrared sensor (re200b) to detect human's movement. We should design a measuring circuit to connect the re200b. When human have some movement in front of the infrared sensor, it can output the waveform in oscilloscope. In the actual effect, it can measure for protect the old man from falling and remind others in the case of an emergency. When we design the measuring circuit, we ask for help from the Dr yan and find information in the internet.
In the whole project, we use one re200b, three amplifiers, many resistances, two diodes and many difference capacitances. In the end, we get the waveform from the re200b and record them. However, we have no time to connect the LED and buzzer to test in the life practice.