Block Diagram
Friday, 10 August 2012 ? 0 comment =)
The picture below shows the block diagram of Body Detector.
Block Diagram of the Body Detector System
At the heart of the Body Detector is a versatile mixer which will detect frequency variations within a small fraction of one percent. While the mixer is deceptively simple, it has a high degree of accuracy as well as flexibility. It starts with sensor detection by the capacitance around human body, thus activate the body detector.
This version of body detector only used two detection sections and also requires no special optimization for the sensor and may be easily adjusted to almost any sensor of one’s choosing.
BLOCK DIAGRAM DESCRIPTION
- At the block diagram of the system, sensor will be the input to the main system. The sensor which put at the body detector will detect any existence of capacitance human body around the body detector in certain distance. Any metal sensor will do and the sensitivity will be different to each metals. When we set the sensor to be a sheet of tin foil (light sensor), the sensitivity to trigger the body detection is high.
- After received the signals form sensor that capacitance is detected, it will trigger
- the binary mixer and monostable timer. If then when a body comes near, the
- frequency of CMOS dual timer will drop, and therefore monostable timer will go
- “high” for duration fractionally shorter than the period of astable. The output of
- CMOS dual timer is fed to the trigger input of another CMOS dual timer. Therefore
- astable triggers monostable CMOS dual timer.
" The ladder of success is best climbed by stepping on the rungs of opportunity."
Block Diagram