Integrated Power Supply with Home Security System
This innovative project combines a versatile power supply unit with a comprehensive home security system. The power supply provides both variable voltage (0-32V) and fixed voltage outputs (ยฑ5V, ยฑ9V, ยฑ12V) with a maximum current of 3A. The integrated security system features fire and gas detection capabilities, addressing critical safety concerns in residential environments.
Power Supply Components
Transformer
12V - 0 - 12V 3A, converts 220V AC to 12V AC
Bridge Rectifier
Converts AC power into DC power
4700ยตF Capacitor
Filters AC noise and stabilizes voltage
Buck Converter
Efficiently converts high voltage to low voltage
Digital Panel Counter
Displays output current and voltage values
Voltage Regulators
7809 (9V), 7805 (5V), 7812 (12V) for fixed outputs
Power Supply Implementation
The power supply implementation involves connecting the 220V AC source to a transformer through a switch. The transformer output is connected to a bridge rectifier to convert AC to DC. A 4700ยตF capacitor smooths the signal, which is then regulated by buck converters (for variable output) and voltage regulators (for fixed outputs). The digital panel counter displays the output values.
Power Supply Circuit Diagram
AC Input โ Transformer โ Bridge Rectifier โ Capacitor โ Buck Converter/Voltage Regulators โ Output Terminals
Security System Implementation
The home security system features two critical detection systems:
In 2022, Egypt experienced 49,341 fire incidents, with 34.5% occurring in residential settings. This alarming statistic underscores the critical need for reliable early detection systems to protect homes and families from fire hazards.
Fire Detection System
The fire detection system uses an IR sensor to detect fire and triggers a buzzer alarm. Components include:
- IR sensor for flame detection
- 5V power source
- Buzzer for audible alarm
- Transistor for circuit control
- Resistors and wiring
Gas Detection System
The gas detection system uses an MQ5 sensor to detect dangerous gas leaks, which can lead to explosive situations. The system includes:
- MQ5 gas sensor module
- 5V buzzer for alarm
- NPN transistor (BC547)
- 5V power source
- Wiring and resistors
Project Team
Khaled Fawzy
Variable Power Supply
Basmla Mohamed
Variable Power Supply
Rahma Idris
Fixed Power Supply
Suhaila El-Hegin
Fixed Power Supply
Aya Mousa
Fixed Power Supply
Doaa Ibrahim
Fixed Power Supply
Jenna Ahmed
Fixed Power Supply
Basmla Taha
Fire Detection
Omima Kandil
Fire Detection
Doaa Khalid
Fire Detection
Ziad Eman
Gas Detection
Zaki Fathy
Gas Detection
Khaled Wasef
Gas Detection
Conclusion
This integrated system provides both a versatile power solution for electronics projects and critical safety features for home environments. The power supply offers both variable and fixed outputs suitable for various applications, while the security system addresses the alarming rate of residential fires in Egypt, particularly those caused by gas leaks that can lead to catastrophic explosions.
The project demonstrates effective team collaboration across multiple technical domains, from power electronics to sensor-based safety systems. By combining these elements into a single solution, the project delivers practical value for both electronics enthusiasts and homeowners concerned with safety.
Project Information
- Category Electronics & Safety
- Institution Higher Institute for Engineering & Technology
- Location Kafr El Sheikh, Egypt
- Project date 2023
- Supervisor Dr. Ebrahim Zewail
- Team Techno Team 151
- Download report
Power Specifications
- Variable Output: 0-32V DC
- Fixed Outputs: ยฑ5V, ยฑ9V, ยฑ12V
- Max Current: 3A
- Input: 220V AC
Security Features
- Fire detection with IR sensor
- Gas leak detection with MQ5 sensor
- Audible buzzer alarms
- Transistor-based control circuits