• Mobile phones are used widely in our everyday lives giving us the freedom to
communicate anywhere and at anytime.
• Equipped with various facilities, it is available to people of all classes. The
affordable price range and the easy application make it a pleasure to use.
• Besides communication, they also have various other services programmed in
• The latest mobile phones are incorporated with features like MP3 players, high
resolution camera, high sound quality, 3G technology and the list goes on.
• The mobile phones have become a hit among all classes of people from kids to
teenagers to adults allowing them to enjoy a tech-savvy lifestyle.
4. These chargers come in five basic varieties:
Emergency chargers and
5. WORKING PRINCIPLE:
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 devices such as our mobile phones. This device captures the energy by
connecting an 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.
6. Mechanical to
Using this energy
to charge Mobile
The mechanism involves three basic stages:
•Conversion of mechanical to electrical energy
•Storing the electrical energy
•Using this energy to charge mobile phones
Conversion of mechanical to electrical energy
7. Using this energy to charge mobile phones:
Most mobile phone chargers are not really chargers, only adapters that provide
a power source for the charging circuitry which is almost always contained
within the mobile phone. They are notably diverse, having a wide variety of
DC connector-styles and voltages, most of which are not compatible with
other manufacturers' phones or even different models of phones from a single
• 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, quality assurance, research and development in various
• 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
• 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-
mechanical devices, such as a dynamo. The mechanism involves three basic stages:
1 Conversion of mechanical to electrical energy 2 Storing the electrical energy 3
Using this energy to charge mobile phone
9. MERITS AND DEMERITS
• 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.
• Only applicable for the particular place.
• Mechanical moving parts is high .
• Initial cost of this arrangement is high.
• Care should be taken for batteries.
10. ADVANTAGES and FUTURE
• 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
• 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
11. 6. Conclusion
Even if 0.1% of the Indian population uses this device, it
can generate 1500 kW/h of energy and can help reduce carbon
emission by 2.25 tones per day. Thus, Walk-N-Charge promises
us a source of energy that is not only clean, portable and
inexpensive, but also charges our mobile while you get charged
12. 7. References
1. J. A. Paradiso and T. Starner, “Energy scavenging for
mobile and wireless electronics,” Pervasive Comput.
IEEE, vol. 4, no. 1, pp. 18–27, 2005
2. P. D. Mitcheson, E. M. Yeatman, G. K. Rao, A. S.
Holmes, and T. C. Green, “Energy harvesting from
human and machine motion for wireless electronic
devices,” Proc. IEEE, vol. 96, no. 9, pp. 1457–1486,
3. M. Jain, U. Tiwari, and M. Gupta, “Mobile charger via
walk,” in Multimedia, Signal Processing and
Communication Technologies (IMPACT), 2011
International Conference on, 2011, pp. 149–152.