Design of automatic energy saving-monitor for reducing the waste of PC electricity

Due to the advancements in Information Technology, the use of PC and monitor has been increasing substantially and has become an important tool in our society. However, these two products use the power on `working state´ even during unused time, such as break time or meal time. This is the waste of power. To reduce the waste of power, the time period for power saving mode can be controlled by PC power management options. But this is difficult method for a beginner. Therefore, this paper proposes a new efficient system to control the power management by a monitor, not by PC. We combine PIR(Pyroelectric Infrared Ray)sensor, USB Keyboard Controller and USB Hub into the monitor. It provides an alternative method to save power consumption by detecting human movement. This system can automatically send a command to PC to go into the sleeping state when user leaves from the seat. And when user comes back to the seat, it can automatically return to the working state. Finally, the power consumption for PC and monitor has been measured. The proposed system can be widely applied to the energy saving product.