In this project, we will show you a simple Electronic Letter Box, a circuit that can be used to indicate whenever receive a mail (physical mail – like a letter). An LED is used as an indication in this Electronic Letter Box Project.

1. ELECTRONICS
LETTER BOX
Course no.: EEE-366
Course title: Digital Electronics Sessional
GROUP MEMBERS
Shantanu Bhattacharjee [ID: 1602002]
Habibur Rahman [ID: 1602004]
Nayem Al Kayed [ID: 1602008]
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2. CONTENTS
Objectives
Introduction
Literature review
Methodology
Work done
Result Analysis
Conclusion
Future works
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3. 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
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4. Introduction
In this project, we will show a simple Electronic Letter Box, a
circuit that can be used to indicate when ever receive a mail
(physical mail – like a letter). An LED is used as an indication in
this Electronic Letter Box Project.
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5. Literature Review
‘’Smart Letter Box System Using Obstacle Sensor For Notifying
the User By Android Application’’ Prof. Anjali Devi Pujari,Priyank
International Research Journal of Engineering and Technology
(IRJET).
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6. Methodology
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7. Components
• LM741 – 1
• CD4001 – 1
• Resistors
• 10KΩ – 5
• 1KΩ – 2
• Capacitors
• 0.1μF – 2
• C1,C2(.1uF) – 2
• LEDs – 2
• LDR
• 5V Power Supply
• Mini Breadboard
• Connecting Wires
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8. Schematic
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9. Work Done
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10. Result Analysis
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Case 01 : Until someone puts a letter in the box
LED remains off.
Case 02: If someone puts a letter in the box LED will be
turned on.

11. Future Works
1.Making a real time monitoring and remote connected system
using GSM.
2.Can be use at government postal offices &Post boxes.
3. Use in bank for cheque drop box also
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12. Conclusion
The progress in science & technology is a non-stop process.
New things and new technology are being invented. As the
technology grows day by day, we can imagine about the
feature in which thing we may occupy every place. We
concluded that principle of science should be-
‘’Nothing is impossible’’
Such that we look to a growth of science in bright world.
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