2. Our project aims at developing a system that saves electricity by
shutting down the system rather than hibernating the system, after
detecting the user’s absence. This is accomplished by the use of the
sensor technology (or switches) attached to the system via a COM
port or microcontroller. The sensor detects the user’s presence or
absence and works by saving running work and shutting down the
PC thereby saving energy.
Conservation of electricity is more essential due to the concern for
fast depletion of non-renewable sources of energy in the country and
in today’s scenario where companies are focusing more on
conservation and accepting a slogan like GO GREEN, this new idea
can bring about a new revolution. Companies can easily buy this
idea and it is profitable too for both manufacturer and companies.
This is just a start and it gives a way to adding new features into it. If
enhanced versions of this project are developed, including new
features and technology, monetary gains are definite
3. Reducing the standby power consumption of a PC monitor
Authors: Cheng-Hung Tsai, Ying-Wen Bai , Li-Chia Cheng , Kung-
Shen Lin
This paper presents a way to reduce the standby power consumption
of a personal computer (PC) monitor in sleep status. Although a PC
monitor enters sleep by means of the power management of the
operating system (OS) after a preset idle time and awakens when the
keyboard is hit or the mouse is moved, the monitor still consumes 0.3-1
W power in sleep status. This design features a socket to plug-in the PC
monitor, which consumes 0.003 W in sleep status and is not only easy
to set up but also inexpensive. This socket supplies the monitor with
power when the user appears; when the user leaves it turns the monitor
off, and the electric power is cut off to reduce the standby power. A
micro control unit (MCU) receives signals from an infrared (IR) sensor
module which detects the user approaching the monitor. The MCU
controls the solid state relay (SSR) On/Off when used as a switch for
cutting off the standby power.
4. Development of High-Resolution Quartz Resonator Force and
Weight Sensor With Increased Reliability
Authors: Zheyao Wang, Huizhong Zhu, Yonggui Dong, and Guanping
Feng
Test-analyze-and-redesign method is employed to develop
a quartz crystal resonator (QCR) force and
weight sensor with increased reliability for batch production. The sensor,
which mainly consists of a QCR and a metal diaphragm structure, has
the advantages of high resolution, digital output, and low cost. The
failure mechanism of the single-diaphragm QCR sensor has been
uncovered by experiments aiming at providing insight into the failure
factors. In order to eliminate the failure stress and improve reliability,
the sensor has been redesigned based on failure analysis results by
designing a double-diaphragm structure. Life testing experiments for
validating the effect of the corrective action show that reliability has
been improved five times, and after redesign, the reliability satisfies the
requirement of practical use. Accelerated life testing is performed to find
acceleration factors and development stresses for batch production.
5. The main idea of the project is to make an application that switches the monitor (or CPU in enhanced
version) to low power state on receiving the signal from the sensor embedded in PC.
Suppose a person is working on a PC and he/she forgot to switch off the PC. Now its effects can be
expressed better through following calculation
Power consumption of a PC and monitor is 170 watt (approximately)
Let the per unit cost be Rs. 4.
i.e. cost of 1 kW * 1hr = Rs. 4.
Now, if a PC remains ON for 10 hrs a day, then total consumption will be
= (170 * 10) / 1000
= 1.7 units per day
If cost of power Rs.4 per unit, then cost of per day per PC cost on power consumption will be
= (1.7 * 4)
= Rs. 6.80
Total cost for a month per PC will be = (6.80 * 30) = Rs. 204
If an organization uses 500 computers, total cost on power consumption for a year will be
= (204*500*12)
= Rs. 12, 24,000
Now, in India, we have many approximately 200 organization.
Therefore, total cost on power consumption will be
= (200 * 12, 24,000)
= Rs. 24, 48, 00,000
Our idea is to reduce this amount which will contribute to the growth of the organization.
6. From the already existing researches we find that IR sensors have been
used in order to achieve the target of power saving. However IR sensors are
too sensitive for solving the purpose. For example if an insect comes in front
of the sensor , the sensor will still b activated and our purpose may fail.
Thereby we propose the usage of a weight sensor or a load cell that can be
fixed to the user’s chair. This sensor can be customized as per the needs i.e.
detecting the weight of a human and not other light weight objects. This
sensor will be connected to the PC using microcontroller which will help the
PC to detect the signal. On getting a positive signal the program will be
initiated and the process of power saving starts.
Also we aim at saving the running documents so that there is no loss of
work. These documents will reappear on the desktop when the PC is
restarted.
7. Desktop/Laptop
89S52 Microcontroller
Capacitors
Resistors
Regulator 7805
LED
IC Max 302
