Engineering design: A model of notification post box

A MODEL OF NOTIFICATION BOX:“NOTIBOX”

GROUP 61ENGINEERING TEAM PROJECT

Date: 14/10/2009Venue: 21.01.05

Group Members

• Muhammad Taufiq Bin Roslan 11608

• Shalini Subramaniam 9698

• Ahmad Ariff Bin Jamaludin 9722

• Siti Nadiah Binti Jamaludin 10202

• Muhammad Syafiq Bin Mohd Ariffin 10228

• Aliya Binti Mhd Zahir 11657

Supervisor: Dr Mokhtar B Awang

2Engineering Team Project Group 61

Contents

1. Background2. Problem statement3. Objectives4. Literature Review5. Materials6. Methods7. Results8. Drawing9. Discussion10. Project Planning11. Conclusion & Recommendations


Background

The main function of the “Notibox” is to notify

the user when there is/are letter(s) inside the letter

box. The notification is only given when the user

open the house main door.


Problem Statement

These problems occur when the user is not in

the house when the letter is delivered:

Important letters are uncollected

Delay in responding urgent letters

Stealing and destruction of the letters


Objectives

Objectives of this system are:

To notify user about urgent letters

To preserve the condition of the letters

To modify the existing letter box


Literature Review

• A sensor according to www.wikepedia.com is a device that measures a physical quantity and converts it into a signal.

• A buzzer referring to www.wikepedia.com is a signaling device.

• A light-emitting diode (LED) is an electronic light source. The description is from www.wikepedia.com.

• The micro switch is an electrical switch. The description is from www.wikepedia.com.

Engineering Team Project Group 61 7

http://www.wikepedia.com/




Material Function

Adaptor Provide power

Zinc plate Act as the sensor

Micro switch Trigger the buzzer

Buzzer Generate sound

Light –emitting diode (LED) Give signal

Materials

Materials used:


Methods


Switch 1 (Door)

Switch 2 (sensor)

Close

Open Close (letter)

circuit onLED&

BuzzerCircuit

off

Results

• Working principles:


Drawings


Front view of the prototype

Sensor

LED

Micro switch

Buzzer


sensor

sensor


The system


Material Advantages Disadvantages

Zinc Low malleable Low creep strength

Aluminum Lightweight Highly Malleable

Discussion

Justification for chosen materials:

Sensor



Zinc Low malleable Low creep strength

Aluminum Lightweight Highly Malleable


Micro switch Cheap Low sensitivity

Reed Switch Sensitive Fragile


Adaptor Longer life time High cost

Battery Cheap Low life time

Switch & Power Supply



Micro switch Cheap Low sensitivity

Reed switch Sensitive Fragile


Adaptor Longer life time

Costly

Battery Cheap Low life time

Problem Solution

Foreign objects Set a minimum load

Sensor exposed to heat Use plywood at the edge

Glue will melt Replace with small screws

Potential problems and solutions:

• In real life:a. LED and buzzer will be inside the house b. Micro switch will be replaces by reed switch

• The minimum weight sensor can detect is 70g.


Problem Solution

Foreign objects Set a minimum load

Sensor exposed to heat Use plywood as support

Melting of glue Replace with small screws

Overall cost of the prototype is only RM 23.00


Materials Cost

LED (40units*RM0.10) RM4.00

Wire RM 0.30

Zinc plate RM 0.40

Resistor (5 units*RM 0.30) RM 1.50

Micro switch RM 0.50

Adaptor RM 10.00

Buzzer RM 3.00Electrical board RM 3.00

Total RM 23.00

Project Planning

Name Tasks

Taufiq Sensor assembly

Shalini Fixing of speaker and LED

Nadiah Circuit assembly

Aliya Engineering Drawing

Afiq Lighting(LED)

Syafiq Design of the house


Conclusion & Recommendations

We successfully designed a better letter box than

the existing letter box. We would like to

recommend “Notibox” because it is cheap with

simple mechanism and very helpful in

making our life more organized.


THE ENDQ&A
