Obstacle Detection Alarm School project & Demonstration kit Using IR Sensor Go Science Classroom Series

Smart Vehicle Collision Warning School Project & Demonstration Kit

See invisible light become a warning.

Turn infrared sensing, electronic comparison and relay switching into a live road-safety learning experience.

The Go Science Classroom Series Obstacle Detection Alarm brings an IR obstacle sensor, adjustable comparator circuit, 5V relay module, active buzzer and protection diode together on one complete pre-wired working platform.

As the included toy vehicle moves towards the sensor, invisible infrared light is directed forward and reflected from the approaching object. The sensor receives the reflected light and checks the response against its selected threshold. When the obstacle enters the detection zone, the relay activates and the buzzer produces an audible collision-warning alert.

Students can follow the complete functional sequence:

Vehicle Approaches → IR Reflection Detected → Relay Switches → Warning Sounds

The model provides a clear foundation for exploring infrared sensing, reflected light, proximity detection, electronic thresholds, relay switching, warning systems and road-safety technology concepts.

Designed for Grades 7–12, it is suitable for school projects, science exhibitions, classroom demonstrations, electronics activities and road-safety concept presentations.

What’s in the Kit?

• Pre-assembled IR obstacle-sensor module
• Adjustable comparator circuit
• 5V relay module
• Pre-wired active buzzer
• Inline protection diode
• Printed road-layout base
• Toy car model with sensor arrangement
• Toy truck or obstacle model
• Pre-connected electrical wires
• Battery snap connector
• Wooden component-support block
• Ready-to-use educational working model
• QR access to the detailed digital manual
• Detailed 16-page full-colour digital instruction manual
• QR access to the video demonstration from the kit box
• Step-by-step working video
• Illustrated component explanations
• Testing and troubleshooting guidance
• Educational-use and storage guidance
• Concept checkpoint
• Certificate of Achievement

The packaging and manual identify the IR sensor, relay, diode, buzzer, road base, toy car, toy truck and battery connector as part of the kit.

Required Separately

9V Battery

The model requires one fresh 9V battery.

Battery is not included.

No separate demonstration material is required; the toy car and toy obstacle vehicle are supplied with the model.

Product Specifications

Product colours, toy-vehicle styles, component placement and wire routing may vary according to production and component availability.

A Complete Guided Learning Experience

Working model, illustrated manual and video demonstration—all connected.

Every Go Science Classroom Series kit is supported by a guided learning experience that helps students understand, observe, test and confidently explain the model.

This kit includes access to:

• A detailed full-colour digital instruction manual
• Illustrated component explanations
• Step-by-step demonstration guidance
• A dedicated working video demonstration
• QR access to digital learning resources
• Observation and troubleshooting support
• Safety and storage guidance
• Concept recap
• Certificate of Achievement

The learning journey is designed to take students through:

Explore → Understand → Watch → Prepare → Test → Observe → Explain → Complete

Students can study the working principle through the manual, watch the physical model in action and then use both resources while preparing for a classroom presentation, school project or science exhibition.

Detailed Full-Colour Digital Manual Included

Scan, learn and demonstrate with confidence.

A QR code supplied with the kit provides access to a dedicated digital instruction and learning manual created specifically for the Obstacle Detection Alarm model.

Students can open the manual on a phone, tablet or computer and revisit it during:

• Project preparation
• Component identification
• Classroom learning
• Demonstration setup
• Science-exhibition practice
• Project-report writing
• Viva preparation
• Troubleshooting
• Revision and concept recap

The current manual contains 16 colourful illustrated pages covering the complete project journey.

It includes:

• A visual introduction to the road-safety model
• A complete guide to the included parts
• IR sensor and reflected-light explanations
• Relay, buzzer and protection-diode concepts
• The complete obstacle-to-alert sequence
• Illustrated setup and testing instructions
• Observation and troubleshooting guidance
• Storage and care instructions
• Educational-use limitations
• Concept checkpoint
• Printable Certificate of Achievement

The component guide appears on pages 5–6, the complete “invisible chain reaction” on page 7, illustrated setup and testing on pages 8–10, troubleshooting on page 11, storage and educational-use guidance on page 12, concept recap on page 13 and the Certificate of Achievement on page 15.

Step-by-Step Video Demonstration Included

Watch the actual model before running the activity.

Every kit also includes access to a dedicated video demonstration showing the physical product, its components and its working sequence.

The uploaded demonstration video shows:

• The product packaging
• The printed road layout
• The IR sensor-equipped toy car
• The toy truck used as the obstacle
• The relay and buzzer section
• The battery connection
• Positioning of the vehicles
• The obstacle-approach demonstration
• Sensor and indicator response
• The warning output

The video can be accessed in three convenient ways:

Product Gallery

The demonstration video is placed alongside the product images on the Go Science product page, allowing parents, teachers and students to see the actual model working before purchase.

Go Science YouTube Channel

The video is also available through the official Go Science YouTube presence for convenient viewing, sharing and revision.

QR Code on the Kit Box

A QR code on the side of the product box provides quick access to the video demonstration whenever students need to revisit the setup or working sequence.

This creates a continuous guided experience:

Scan → Watch → Prepare → Demonstrate → Rewatch

Internet access and a compatible QR-scanning device are required to open the online resources.

The Invisible Chain Reaction

Explore how reflected light becomes an audible alert.

The model presents obstacle detection as one connected electronic process.

The IR module emits invisible infrared light in the direction of travel. When a vehicle or obstacle enters the sensing area, part of that light reflects from the object and returns to the receiver.

The onboard comparator evaluates the reflected-light response against the selected threshold. When the response crosses that threshold, the module sends a digital trigger to the relay.

The relay then completes the buzzer circuit and produces the warning alert.

Students can trace the complete pathway:

IR Emitter → Approaching Obstacle → Reflected IR Light → Receiver → Comparator → Relay → Buzzer

Each stage performs a specific function, helping students understand how several electronic components work together to create an automatic response.

Pre-Wired for Direct Exploration

Begin with a complete working foundation.

The IR sensor, comparator, relay module, active buzzer, protection diode, battery connector and circuit connections are arranged as one pre-wired working system.

This allows students to move directly into meaningful exploration:

• Observe invisible-light sensing through its visible output
• Move the vehicle through different positions
• Identify when the detection threshold is crossed
• Follow the signal from sensor to relay
• Hear the relay’s mechanical switching action
• Listen to the warning buzzer
• Run repeated approach-and-retreat tests
• Compare different obstacle positions
• Record and explain observations
• Explore the effect of threshold adjustment
• Troubleshoot changes in sensor response
• Connect the model with wider mobility and automation concepts

The model is designed to be:

Observed → Tested → Retested → Understood → Explained → Built Upon

Watch the Complete System Respond

1. Power the Model

Connect a fresh 9V battery using the supplied battery snap connector.

The sensor and relay system receive power, and the module indicator may illuminate.

2. Emit Infrared Light

The IR obstacle sensor continuously sends invisible infrared light forward.

Although this light cannot be seen by the human eye, its effect can be observed through the electronic response of the model.

3. Move the Vehicle Forward

Place the included toy truck or obstacle ahead on the printed road and move the IR sensor-equipped toy car slowly towards it.

4. Detect the Reflection

As the vehicles move closer, infrared light reflects from the obstacle and returns to the receiving element of the sensor.

5. Compare the Response

The onboard comparator evaluates the received reflection against the threshold selected using its adjustment control.

6. Trigger the Relay

When the response crosses the selected threshold, the sensor’s digital output activates the 5V relay.

Students may hear a clear mechanical click as the relay switches.

7. Sound the Warning

The relay completes the active-buzzer circuit.

The buzzer produces an audible warning representing a collision-alert response.

8. Move Away and Reset

When the car is moved backwards and the obstacle leaves the detection zone, the reflected-light response falls below the threshold.

The relay releases and the buzzer stops.

The complete sequence is:

Approach → Detect → Compare → Switch → Warn → Move Away → Reset

The supplied manual and packaging confirm this obstacle-triggered relay and buzzer sequence.

Explore the IR Obstacle Sensor

Discover how invisible light can detect an approaching object.

The sensor module contains two important optical elements:

• An infrared emitter
• An infrared receiver or photodiode

The emitter sends infrared light towards the space in front of the vehicle. When an obstacle is present, some of the light reflects back towards the receiver.

The sensor module converts this reflected-light response into an electronic signal.

Students can explore:

• Infrared light
• Invisible electromagnetic radiation
• Light emission
• Reflection
• Photodiode sensing
• Proximity detection
• Sensor inputs
• Environmental response
• Cause-and-effect relationships
• Converting reflected light into an electronic output

The module detects reflected infrared light rather than directly measuring an exact distance.

Its response can vary according to:

• Object distance
• Object size
• Surface colour
• Surface finish
• Angle of approach
• Sensor alignment
• Bright surrounding light
• Comparator sensitivity setting
• Battery condition

This makes the model useful for observation and controlled testing.

Discover Threshold-Based Detection

See how a selected response level becomes a trigger point.

The IR module includes an onboard comparator and adjustable sensitivity control.

The receiver’s reflected-light response may change gradually as an obstacle moves closer. The comparator determines when that response has crossed the selected threshold.

Students can observe:

• The sensor receiving reflected light
• The comparator checking the response
• The indicator changing state
• The digital output triggering the relay
• The buzzer activating at the selected point

Under adult or teacher guidance, small threshold adjustments may be used to explore:

• Why the warning may activate earlier or later
• How ambient light can influence the response
• How different obstacle surfaces affect detection
• Why sensor alignment matters
• Why only one setting should be changed at a time
• How the model can be reset and retested

This is a threshold-response demonstration and does not display the obstacle distance numerically.

Explore Relay-Based Switching

Hear an electronic signal become a physical switching action.

The model includes a 5V relay between the sensor output and the buzzer circuit.

When the IR module sends the trigger signal, the relay’s internal electromagnetic coil activates. Its contacts change position and complete the output circuit.

Students can explore:

• Electromagnetic relays
• Relay coils
• Common terminals
• Normally Open contacts
• Electrically controlled switching
• Mechanical switching action
• Sensor-controlled outputs
• Input, control and output stages
• How one circuit can operate another
• Automatic warning systems

The relay’s indicator and mechanical click provide visible and audible evidence that the switching stage has responded.

Reverse-Polarity Protection

Explore how a diode helps protect the electronic system.

The model includes an inline protection diode within the power connection.

A diode allows current to flow primarily in one direction. If the battery is accidentally connected with reversed polarity, the diode helps block the incorrect current path and protect the sensitive electronic components.

Students can explore:

• Positive and negative polarity
• Direction of current flow
• Basic diode behaviour
• Reverse-polarity protection
• Circuit-protection design
• Why electronic systems require correct battery orientation

The diode provides an additional protective feature. The battery should still always be connected carefully and in the correct orientation.

Understand the Complete Functional System

A Road-Safety Context Students Can Understand

Connect sensing technology with safer-mobility concepts.

The printed road layout and two toy vehicles provide a clear context for the electronic system.

Each element represents a stage within a collision-warning concept:

• The sensor-equipped car represents the monitoring vehicle.
• The toy truck represents an approaching obstacle.
• The IR module represents the detection stage.
• The comparator represents the trigger decision.
• The relay represents the automatic switching stage.
• The buzzer represents the warning output.
• The road layout provides the application context.
• The battery powers the demonstration.

This arrangement helps students explain:

• How the system observes the road ahead
• How reflected light is detected
• How a threshold creates a trigger point
• How the warning output is activated
• How sensing can support road-safety awareness
• How several components operate as one coordinated system

The model demonstrates collision-warning logic in a classroom context.

Test. Observe. Discover.

The model supports several controlled investigations using the included toy vehicles.

Approach-and-Retreat Test

Place the toy truck ahead of the sensor-equipped car.

Move the car slowly forward until the warning activates. Then move it backwards until the warning stops.

Repeatability Test

Repeat the same approach using a similar path and speed.

Record whether the warning activates at approximately the same position.

Obstacle-Angle Test

Turn the obstacle slightly to different angles.

Observe how the direction of the reflecting surface affects the sensor response.

Surface-Reflection Test

Under teacher supervision, place different safe objects ahead of the sensor.

Compare the response from:

• Light-coloured surfaces
• Dark-coloured surfaces
• Smooth surfaces
• Textured surfaces
• Flat surfaces
• Curved surfaces

This helps students understand that reflected-light sensors depend on the optical characteristics of an object.

Ambient-Light Observation

Compare the model’s response in normal indoor lighting and near a bright window or direct lamp.

Bright light may influence the optical sensor and its threshold response.

Sensitivity Exploration

Under adult or teacher supervision, make a small adjustment to the onboard trimmer.

Repeat the approach test and observe how the trigger point changes.

Only small adjustments should be made, and the original position should be noted.

Signal-Path Investigation

Students can identify and trace:

• IR emitter
• IR receiver
• Comparator
• Digital-output connection
• Relay input
• Relay contacts
• Buzzer circuit
• Protection diode
• Battery supply

Learn Through Every Demonstration

Watch

Review the complete video demonstration before beginning.

Predict

At what point might the warning activate?

Prepare

Position the vehicles and ensure the sensor pathway is clear.

Test

Move the sensor-equipped car slowly towards the obstacle.

Observe

Watch the indicator, listen for the relay click and hear the buzzer.

Record

Document the obstacle type, position, angle and warning response.

Compare

Repeat the activity using different positions or surfaces.

Analyse

Explain why the warning activated sooner, later or not at all.

Troubleshoot

Check the battery, ambient light, sensor alignment, sensitivity and visible connections.

Explain

Describe the complete reflected-light-to-warning pathway.

Extend

Develop further questions about proximity sensing, robotics, mobility and automatic alert systems.

Explore Key Concepts

Infrared Sensing

• Infrared light
• Invisible radiation
• IR emitters
• Photodiodes
• Reflected-light detection
• Proximity sensing

Electronic Circuits

• Sensor modules
• Comparator circuits
• Adjustable thresholds
• Digital output
• Power supply
• Audible output

Relay Switching

• Electromagnetic coils
• Relay contacts
• Normally Open switching
• Signal-controlled circuits
• Automatic response
• Mechanical switching

Circuit Protection

• Battery polarity
• Diode operation
• Direction of current
• Reverse-polarity protection
• Component safety

Road-Safety Concepts

• Obstacle awareness
• Collision-warning logic
• Driver-assistance concepts
• Warning systems
• Safer mobility
• Sensor-assisted observation

Practical Investigation

• Controlled movement
• Repeatability
• Reflection comparison
• Threshold testing
• Cause-and-effect reasoning
• Troubleshooting

One Model. Multiple Learning Outcomes.

The model allows students to explore how:

• Invisible infrared light can be emitted and detected
• An obstacle can reflect light towards a sensor
• A photodiode converts light into an electronic response
• A comparator checks the response against a threshold
• A digital signal activates a relay
• A relay switches a separate buzzer circuit
• A warning can reset when the obstacle moves away
• Object position and surface affect optical sensing
• Several components operate as one coordinated system
• Sensor technology can support road-safety concepts

Built for Confident Demonstration

The visible road layout, included vehicles, relay response, warning buzzer and guided learning resources make the model suitable for:

• School science projects
• Science exhibitions
• Classroom demonstrations
• IR sensor demonstrations
• Relay-switching demonstrations
• Reflected-light experiments
• Road-safety presentations
• Collision-warning concept models
• Sensor-circuit explanations
• Proximity-detection activities
• STEM learning
• Experiential learning
• Project-based learning
• Project-report preparation
• Viva and oral presentation
• Grades 7–12

Suggested Student Explanation

“This is an obstacle-detection and collision-warning working model using an infrared sensor. The sensor emits invisible infrared light in front of the vehicle. When an obstacle approaches, some of this light reflects back to the receiver. The comparator checks the reflected-light response against a selected threshold. When the threshold is crossed, the module sends a signal to the relay. The relay completes the buzzer circuit and produces a warning alert. When the vehicle moves away, the relay releases and the buzzer stops. The model demonstrates IR sensing, reflected light, threshold response, relay switching and road-safety concepts.”

Build Upon the Foundation

Once students understand the original obstacle-to-warning sequence, the model can inspire further questions:

• Could an LED provide a visual warning?
• Could different warning stages be created?
• Could the sensor response be displayed numerically?
• Could two sensors monitor different directions?
• Could a microcontroller record detection events?
• Could a servo demonstrate steering response?
• Could a model motor demonstrate braking logic?
• Could the project become a parking-assistance concept?
• Could it be expanded into a robot obstacle detector?
• Could different sensor technologies be compared?
• How would ultrasonic sensing differ from infrared sensing?
• Why do real automotive systems use multiple sensors and testing standards?

These are further learning directions. Additional components, programming and suitable technical guidance may be required.

This Concept Can Also Be Used to Explore

The sensing, comparison, switching and alert sequence can support discussions around:

• Vehicle collision-warning concepts
• Parking-assistance concepts
• Robot obstacle detection
• Proximity-warning systems
• Automatic-door sensor concepts
• Warehouse movement alerts
• Smart-mobility systems
• Blind-spot awareness concepts
• Object-detection circuits
• IR security-beam concepts
• Sensor-controlled alarms
• Relay-operated warning systems
• Reflective optical sensing
• Automatic notification concepts
• Input-process-output systems
• Electronic automation

These are educational concept extensions based on the model’s functional sequence. They are not additional built-in functions of the supplied product.

Curriculum and Concept Connections

The project can support classroom discussion around:

• Electricity and electrical circuits
• Magnetic effects of electric current
• Electromagnetic relay operation
• Semiconductor photodiodes
• Infrared reflection
• Sensor technology
• Automatic warning systems
• Road-safety awareness
• Input-process-output relationships

The supplied concept-mapping document links the model with selected electricity, electromagnetism, semiconductor-sensing and road-safety concepts for Grades 7–12. These are independent educational references and do not imply approval or endorsement by NCERT, CBSE or any school board.

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A Complete Learning Journey

Scan the code.

Watch the demonstration.

Read the manual.

Position the vehicles.

Power the model.

Move towards the obstacle.

Follow the reflected light.

Hear the relay switch.

Listen to the warning.

Move away and reset.

Record the result.

Explain the system.

Build upon the idea.

The Go Science Obstacle Detection Alarm transforms invisible-light sensing, relay switching and road-safety concepts into a guided working experience students can observe, investigate and confidently demonstrate.

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Important Educational and Usage Information

This product is an educational demonstration model and science teaching aid.

• Adult or teacher supervision is recommended.
• Use the model only on a flat, clean and dry surface.
• Use only the supplied toy vehicles or other safe lightweight demonstration objects.
• Move the vehicle manually and slowly.
• Keep the sensor lenses clean and correctly aligned.
• Keep the model away from direct sunlight and very bright light sources during testing.
• Do not bend or force the sensor module.
• Keep the buzzer and relay activation brief.
• Connect the 9V battery using the correct orientation.
• Disconnect the battery immediately after every demonstration.
• Never store the model with the battery connected.
• Store the kit in a cool and dry location.
• Internet access is required for the online manual and video.
• Product appearance and component arrangement may vary slightly due to manufacturing and component availability.

Important Product Limitation

This model demonstrates obstacle-triggered warning logic for educational observation.

It is not:

• An automotive safety device
• An advanced driver-assistance system
• A certified collision-warning system
• A parking sensor for installation
• An autonomous-driving system
• A braking controller
• A steering controller
• A vehicle-stopping device
• A road-use product
• A life-safety device

It produces a warning only. It does not brake, steer, slow or stop a vehicle and must never be installed in or relied upon in a real vehicle.