Raynal
Chandra

Start with the user problem

The first design decision was that the warning could not depend on a visual interface. The person using the stick needed to understand that something was nearby while still concentrating on walking. This led to the use of tactile vibration as the primary feedback method and a beeper as a secondary warning.

Use an Arduino Uno as the central controller

An Arduino Uno was used because it provided a straightforward way to connect multiple sensor inputs and control the warning outputs in one embedded system. It became the decision making part of the prototype. The Arduino continuously read the sensing hardware, interpreted the proximity information and selected the appropriate feedback state.

Combine proximity and infrared sensing

The prototype used proximity and infrared sensing to look at the environment ahead of the stick. The purpose of using electronic sensing was to detect an object before the end of the stick physically reached it. Sensor placement therefore mattered because the sensing area needed to represent the path immediately in front of the user rather than pointing too far away from the direction of travel.

Translate sensor information into a warning decision

The Arduino program repeatedly checked the sensor readings and compared them against the warning logic. When the system detected that a person or object was close enough to create a collision risk, the controller changed the output state. This separated the project into three clear functions: sensing, decision making and user feedback.

Use vibration as the main feedback method

A vibration motor was selected because the user could feel the warning directly through the stick. This avoided depending entirely on sound, which could be difficult to notice in a noisy environment. The beeper was added as a second warning method so the system had both tactile and audible feedback.

Package the electronics around the stick

The sensing hardware needed to face the direction of travel while the Arduino and wiring needed to remain protected and out of the way of the user. The wiring was routed so it did not interfere with the normal use of the stick, and the feedback device was positioned where vibration could be transferred effectively to the user's hand.

Test the complete behaviour rather than each part alone

After individual components were operating, the important test was whether the whole system behaved sensibly as an obstacle approached. The prototype was tested against nearby people and objects at different positions and distances while checking that the warning occurred before the user would normally make contact with the object using the stick.

Refine the response

Testing helped identify where sensor positioning, warning behaviour and wiring arrangement could be improved. The goal was to avoid a system that constantly warned the user when there was no immediate risk while still giving enough notice when an obstacle was genuinely close.

Reuse the core proximity idea

The project began with the same basic principle as the walking stick: sense an obstacle before contact occurs. The main engineering change was the interface. A vehicle reversing system could provide more detailed information because the driver was able to look at a display.

Read the distance to the obstacle

The proximity sensor monitored the area behind the simulated vehicle and produced information that changed as the prototype moved closer to a wall or fixed object. The controller repeatedly sampled this information so the displayed value could update as the distance changed.

Convert the sensor reading into useful distance information

The controller processed the sensor input and converted it into a proximity value that could be understood by the driver. This was important because raw sensor information is not useful by itself. The program had to turn the measurement into something meaningful on the display.

Send the result to the screen

The calculated distance was displayed visually so the driver could see the remaining space before the vehicle reached the obstacle. This made the system more informative than a simple warning light because the user could watch the distance reduce during reversing.

Add proximity warning logic

The program also divided the measured range into warning conditions so the user could quickly understand when the vehicle was moving from a safe distance toward a more critical distance. The warning behaviour and displayed reading worked together rather than acting as separate features.

Test using a fixed wall or object

The prototype was moved toward a known fixed object while the screen was monitored. The purpose of the test was to confirm that the displayed distance changed in the correct direction and that the warning state became more urgent as the remaining space reduced.

Refine the user feedback

The system was adjusted so the information was easy to interpret without distracting the user. The main lesson was that a good reversing aid needs both measurement and communication. Detecting the wall is only part of the problem; the system also needs to tell the driver clearly what that measurement means.

Create the mechanical pressure platform

The main prototype used two wooden plates with a spring like mechanism between them. The upper plate moved when a person stepped on it, applying force to the energy harvesting elements, while the spring action allowed the plate to return after the pressure was removed.

Position the piezoelectric crystals

Piezoelectric crystals were installed so the movement of the upper plate placed mechanical stress on them. When pressure was applied, the elements produced an electrical output. Using several elements allowed the project to demonstrate energy generation across repeated footsteps rather than relying on a single element.

Rectify the raw output

The piezoelectric output needed to be conditioned before it could be treated like a useful charging source. A rectifier circuit was used so the electrical output was converted into a consistent polarity for the following stages. This was the first step in turning an irregular generated signal into usable stored energy.

Use a buck boost converter

Footsteps do not produce exactly the same electrical output every time. A buck boost stage was therefore included so the voltage could be conditioned toward the level needed by the charging system even when the generated input changed.

Control battery charging

The conditioned electrical output was passed to a charge controller before reaching the battery. This created a proper charging path rather than trying to connect the changing piezoelectric output directly to storage. The full electrical chain became generation, rectification, voltage conversion, charge control and battery storage.

Test the system one stage at a time

Testing was carried out across the electrical path rather than only checking the battery at the end. The generated output was checked after pressure was applied, then the behaviour of the rectifier, buck boost circuit and charge controller was checked as the energy moved through the system.

Design around changing weather rather than one energy source

The concept started from the limitation that no single renewable source is available at full output all the time. A fixed solar panel depends on sunlight, wind generation depends on wind, and hydro depends on available water. The house therefore used several generation ideas so one source could contribute when another was weak.

Build hydro generation into the drainage concept

The miniature house used a drainage based hydro generation idea. Water could come from a lake style source or from rainfall collected through the drainage system. Before the water reached the storage tank, it was directed through a wheel or turbine mechanism so the moving water could contribute electrical generation.

I liked this part because it treated drainage water as something that could potentially perform useful work before being stored. The same rainwater that would normally be directed away from the house became part of the energy system.

Make the solar panel follow the strongest light

Rather than mounting the solar panel in a fixed position, the panel was placed on a rotating mechanism. Light dependent resistors were positioned so the system could compare light intensity from different directions.

The purpose was to make the model respond to the location of the strongest light source and keep the solar panel pointed toward the brightest available area rather than assuming the best angle would remain constant.

Control solar tracking with an Arduino Uno and servo motor

The LDR values were read by an Arduino Uno. The program compared the light levels and determined which direction contained the stronger light. A servo motor then rotated the solar panel toward that direction.

This created a closed feedback loop: the sensors measured light, the Arduino made the decision, the servo moved the panel, and the sensors were read again to continue adjusting the position.

Add wind generation

A wind generation element was included as another weather dependent source. The idea was that conditions which reduced solar performance might still provide wind, allowing the overall house concept to draw from a different form of renewable energy.

Integrate footstep power generation

The footstep generation work was incorporated into the smart house concept as an additional small scale source. This allowed human movement around the house to be represented as another opportunity to recover energy, even though the amount of power from this method was much smaller than the primary generation methods.

Wire the miniature house loads

The model included electrical loads such as lighting and other miniature household equipment. These loads made it possible to demonstrate the complete idea of generation, monitoring and consumption rather than only showing isolated power sources.

Add Raspberry Pi IoT monitoring

A Raspberry Pi was used as the IoT monitoring and control layer. It provided a way to monitor power generation and control lights and electrical equipment inside the miniature house. This connected the electrical energy system to software based monitoring and control.

Think about the system as a whole

The most important part of the project was not any one generator. The goal was to demonstrate how several imperfect energy sources could be combined so the house had more options under different weather scenarios. The project became an exercise in system integration rather than only individual circuit design.