Walk n charge (report)

WALK ‘N’ CHARGE
ARPIT (16284)

Real Time Battery Charging
System by Human Walking
ABSTRACT
Walking is the lightest form of exercise. It costs nothing but pays
much. An average human takes 5000 steps a day. Each footstep creates
a great amount of force which is equivalent to bodyweight of person.
In this, we are generating electrical energy as nonconventional method
by simply walking on the footstep. Mobile phone takes a big part in
our lives nowdays. Like us they also required external source of energy
to work. When our smart phone runs out of battery at the worst
moment but soon taking a walk could solve this problem.
The walking charger provides the power solution, it gives people the
ability to charge their mobile device batteries anytime anywhere from
their own walking. They can become their own personalpower source.
So now when you go out for a walk you can keep yourself healthy as
well as your phone battery too.
We will able to save 1 billion KWH energy per year which is used up in
charging phone worldwide.

Introduction
Man has needed and used energy at an increasing rate for his
sustenance and well-being ever since he came on the earth a few
million years ago. Due to this a lot of energy resources have been
exhausted and wasted. Proposal for the utilization of waste energy of
foot power with human locomotion is very much relevant and
important for highly populated countries like India and China where
the roads, railway stations, bus stands, temples, etc. are all over
crowded and millions of people move around the clock
Modern technology has led to machines to enhance the use of human-
power in more efficient manner. In this context, pedal power is an
excellent source of energy and has been in use since the nineteenth
centurymaking use of the most powerfulmuscles in the body. Ninety-
five percent of the exertion put into pedal power is converted into
energy. Pedal power can be applied to a wide range of jobs and is a
simple, cheap, and convenient source of energy. However, human
kinetic energy can be usefulin a numberof ways but it can also be
used to generate electricity based on different approaches and many
organizations are already implementing human powered technologies
to generate electricity to power small electronic appliances.
The walking charger provides the power solution, it gives people the
ability to charge their mobile device batteries anytime anywhere from
their own walking. They can become their own personalpower source.
So now when you go out for a walk you can keep your self healthy as
well as your phone battery too.
We will able to save 1 billion KWH energy per year which is used up in
charging phone worldwide.

METHODOLOGY
In this Electrical Power Generation Using Foot Steps Project, we are
generating electrical power as non-conventional method by simply
walking or running on the footstep. For this purpose, piezoelectric
sensor is used in order to measure force, pressure and acceleration by
its change into electric signals. A piezoelectric sensor is an electric
device which is used to measure acceleration, pressure, or force to
convert them to an electric signal. These sensors are mainly used for
process control, qualityassurance, research and development in various
industries. The applications of this sensor involve, aerospace, medical,
instrumentation, and as a pressure sensor it is used in the touch pad of
mobile phones. In the automotive industry, these sensors are used to
monitor ignition when developing internal burning engines.
Two technologies have been tested so far to convert energy
used in walking into electrical power.
1: Uses of piezoelectric material.
2: Placing small electro-mechanicaldevices, such as a dynamo.
The mechanism involves three basicstages:
1 Conversion of mechanical to electrical energy
2 Storing the electrical energy
3 Using this energy to charge mobile phone

BLOCK DIAGRAM
The complete diagram of the foot step power generation is given
below. Only one step is inclined in certain small angle which is used to
generate the power. The pushing power is converted into electrical
energy by proper driving arrangement. The rack & pinion, spring
arrangement is fixed at the inclined step. The spring issued to return
the inclined step in same position by releasing the load. The pinion
shaft is connected to the supporterby end bearings as shown in fig.
The larger sprocket also coupled with the pinion shaft, so that it is
running the same speed of pinion. The larger sprocket is coupled to
the small cycle sprocket with the help of chain (cycle). This larger
sprocket is used to transfer the rotation force to the smaller sprocket.
The smaller sprocket is running same direction for the forward and rev
ersedirection of rotational movement of the larger sprocket. This
action locks like a cycle pedaling action. The fly wheel and gear wheel
is also coupled to the smaller sprocket shaft. The flywheel is used to
increase the rpm of the smaller sprocket shaft. The gear wheel is
coupled to the generator shaft with the help of another gear wheel.
The generator is used here, is permanent magnet D.C generator. The
generated voltage is 12Volt D.C .This D.C voltage is stored to the Lead-
acid 12 Volt battery. The batteryis connected to the inverter. This
inverter is used to convert the 12Volt D.C to the 230 Volt A.C. This
working principle is already explained the above chapter. This 230 Volt
A.C voltage is used to activate the light, fan and etc.
By increasing the capacityof battery and inverter circuit, the power
rating is increased. This arrangement is fitted in shopping complex,

college and wherever the large people walking on the footsteps
simultaneously.
Using piezoelectricmaterial
A piezoelectric sensor is a device that uses the piezoelectric effect to
measure pressure, acceleration, strain or force by converting them to
an electrical signal.
Piezoelectric material is a material that produce electricity when we
apply mechanical stress.
A piezoelectric sensor is a device that uses the piezoelectric effect to
measure pressure, acceleration, strain or force by converting them to
an electrical signal.
Piezoelectric sensors have proven to be versatile tools for the
measurement of various processes

WORKING
The pushing power is converted into electricity. Whenever force
is applied on piezoelectric crystalthat force is converted to
electrical energy. It can be used for basic purpose like charging
mobile phone, torch. They generate electricity when they are
compressing. So, when we press them while walking or running
they start acting like a tiny battery. We can store it in a battery
and used later in other purpose.
we can take advantage of this special property by putting piezo
elements underneath our feet in such a way that every time we
take a step, we are using our weight to push on the piezo electric
elements- which then in turn convert that energy into electricity.
The only issue with this, however is that we need DC, not AC in
order to power our stuff. We can solve this problem by creating a
bridge rectifier with diodes to convert the AC power to DC
power we can use.
BLOCK DIAGRAM

Placing small electromechanical devices, such as a dynamo
Dynamos convert mechanical rotation into electric power.
Dynamo - a device that makes direct current electric power
using electromagnetism.
A dynamo is an electrical generator that creates direct current
using a commutator. Dynamos were the first electrical
generators capable of delivering power for industry, and the
foundation upon which many other later electric-power
conversion devices were based, including the electric motor, the
alternating-current alternator, and the rotary converter.
Today, the simpler alternator dominates large scale power
generation, for efficiency, reliability and cost reasons. A dynamo
has the disadvantages of a mechanical commutator. Also,
converting alternating to direct current using power rectification
devices (such as vacuum tubes or more recently via solid state
technology) is effective and usually economical.
The word dynamo (from the Greek word dynamis (δύναμις),
meaning force or power) was originally another name for an
electrical generator, and still has some regional usage as a
replacement for the word generator. The word "dynamo" was
coined in 1831 by Michael Faraday, who utilized his invention
toward making many discoveries in electricity(Faraday
discovered electrical induction) and magnetism.

WORKING
This device has to be worn below the knee cap on one leg and a
light string is attached to the other leg. The strides taken help in
pulling and retracting the string, which is further attached to a
dynamo that generates about 3.5 Watts; enough to charge low-.
powered electrical generator to leg movements. When the
person extends the gap between the legs, power is generated by a
gear that turns and spins the generator. The flexion of the leg
turns off the gear so as not to discomfort the person.
Walking involves a change in relative displacement of around ?35
cm between legs. This repeated linear motion could be converted
to rotary motion with the help of a pulley and string. Thus, the
bio-mechanical work is converted into mechanical form and
eventually stored as chemical energy in batteries to store electric
energy. The device is clamped on one leg and a hole lets out a
string that is attached to the other leg that helps in the
conversion of the displacement into rotary motion

Even a slight displacement pulls the string out, therebyrotating
the pulley, which turns the central shaft. The shaft is common to
the gearbox, the dynamo and the recoil mechanism. So, when
the displacement reduces, there is a slack in the string, which is
removed by the tension produced by the recoil system. Since the
electricity produced is bi-directional and contains spikes, an
electronic circuit encompassing a rectifier and a filter converts it
into a unidirectional, spike-free wave and stores the energy
produced in rechargeable batteries. This stored energy is used as
an input supplyto mobiles with the help of different adapters.
This new device is motion sensitive, being auto-activated byleg
movements and it does not increase the energy spent with
walking.
IMPORTANT QUESTION
Storing the electrical energy:
Since the electricity produced is bi-directional and contains
spikes, an electronic circuit encompassing a rectifier and a filter
converts it into a unidirectional, spike-free wave and stores the
energy produced in rechargeable batteries. This stored energy is
used as an input supplyto mobiles
How many steps do we need to take to completely charge
the mobile?
Three to four thousand steps or a 5-6 km walk can generate
enough electricity to charge the mobile twice. Charge also
depends on body weight. Body weight is directly responsible for
the amount of pressure on the crystals. If the pressure is higher,
the electricity generated is more.

How much powerdoes it save?
Power saved per full charge is equivalent to the power consumed
by a 50-Watt bulb in an hour. The power generated by this
device is eco-friendly, as the only input is pressure of human
feet. There is no manufacturing needed because plates already
available in the market are used. Also, the power thus produced
does not generate any heat.
MERITS AND DEMERITS
MERITS
 Power generation is simply walking on the step
 Power also generated by running or exercising on the step.
 No need fuel input
 This is a Non-conventional system
 Battery is used to store the generated power

DEMERITS
 Only applicable for the particular place.
 Mechanical moving parts is high
 Initial cost of this arrangement is high.
 Care should be taken for batteries
ADVANTAGES and FUTUREPROSPECTIVES:
Increasing the effectiveness of mobiles in rural India by
providing a portable means of charging of mobiles, torches,
radios.
Helping military personnel charge their GPS devices and other
low-power electronic gadgets while on the move.
Providing an alternate means to wall-based charging for MP3
players, mobiles, etc in cities, thereby, helping today?s fast
generation to move faster without mobile batteryproblems.
India has signed the Kyoto Protocol ? an acknowledgement that
we share the concern of global warming, which also expresses
our commitment to slow down climate change. Walk-N-Charge
would just add to the efforts put in by India in various innovative
ways.
Charging your cell phone might soon be as simple as taking a
walk around the block.

CONCLUSION
• The project Footstep Power Generation uses the footstep to
produce electricity. It is one of the best economical and
affordable energy solution to the common people.
• This can be used for many application in rural areas where power
availability is less or totally absent. As India is and developing
nation where energy management is big challenge for such a
huge population.
• Even if 0.1% of the Indian population uses this device, it can to
help reduce carbon emission by 2.25 tones per day.
• This is a Non-conventional system
• Eco friendly
• Cheaper than solar system

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Walk n charge (report)