Page 16 - Towards A Sustainable Future , Phase 3 2025, E-Book_Neat

The alternator attached to the bike generates electricity
when the pedals are in motion. The alternator converts the
mechanical energy from pedalling into direct current (DC)
electricity. The output of the generator is from 0V to 30V DC.
As the speed of pedalling will not be consistent, the electricity
generated by the alternator will thus be inconsistent. The
voltage regulator is in place, ensuring that the voltage output
remains stable and suitable for the subsequent components.
This maintains the voltage at 5V or 12V to charge the battery.

The regulated electricity is sent to a battery bank for storage.
In this diagram, the battery bank consists of 10Ah LiPo
batteries. These store the generated energy for later use. The
stored energy is output in DC form via the USB-C port. The
production of the battery is regulated to 5V or 12V DC and
delivered to the device that is being charged.
(A) The original spin bike is awaiting condemnation at ITE College
This energy is harvested through an electromechanical system East. (B) A side view showcases the modifications applied, with
that converts kinetic motion into electrical energy via an orange boxes highlighting the added components. (C) An example
alternator. The generated electricity can then be tapped and display shows the energy generated and the power bank used to store
stored in a battery for future use. The kinetic energy produced the energy. (D) Schematics illustrating the modified spin bike design.
by pedalling is transferred to an alternator, which converts it Figure 1: Adaptations to the Spin Bike
into electrical energy as seen in Figure 1D. For data collection
purposes and a more straightforward metric for conversion,
kWh was used as seen in Figure 2.

The electricity generated is stored in a battery as seen in
Figures 1(B) & (C), potentially making it available for low-
power applications like lighting or charging devices. To
implement the concept without altering the existing spin
bikes at Anytime Fitness Loyang Point, modified bicycles
from the ITE campus were used and placed at the gym for
testing. To boost user engagement and foot traffic, the gym
staff promoted the initiative on social media. It highlighted
the eco-friendly bikes to new visitors, showcasing the gym's
dedication to sustainability.
Figure 2: Reading, with watt-hours (Wh) serving as the primary
metric for measurement.

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