2. enerlogic Energy Smart Office Control System
GROUP 4
Orchi Hassan Tanvir Ahmed Lutful Kabir Syed Shakib Sarwar Tanjib Atique

3. Project Description
Development of a microcontroller based feedback control system for automatic operation control of basic electrical appliance for an industry, commercial or residential building. The system controls the appliances based on the desired room condition, outside condition, number of people in the room and available power.

4. DESIGN FEATURES Automatic Temperature Control Light Control
Function according to available Voltage Level
Occupancy Sensing
Fire/ Over Heat Alarm

5. DESIGN APPROACH

6. HARDWARE and SOFTWARE Used
Purpose 1
MikroC Pro for AVR
Microcontroller code 2
Extreme Burner AVR
Code burning 3
ISIS 7 Professional
Simulation 4
ARES 7 professional
PCB Layout
Component
Name
Specifications 1
MicroController
AtMega32L
5V supply, 40Pins 2
Oscillator
Crystal
External -8MHz 3
Temperature Sensor
DS18B20
-55oC-128oC 4
Transformer
Center Tapped Xf
220V-12V/24V 5
Motor Driver IC
L293D -
Motor
DC Gear Motor
12V 6
LDR
100Ω-2MΩ 7
LED
5V LED
Red,Green,White 8
Potentiometer
470KΩ,100KΩ,33KΩ,10KΩ 9
FAN
DC Fan 10
MOSFET
IRF 640 11
LCD
2Line Display 12
Resistor
Various Values 13
Capacitor

7. DESIGN PROCEDURE : Step One : Placement Of Components
Temperature Sensor
Light Sensor
Occupancy Sensor
Window Sensor
Transformer
Motor
Motor Driver IC
LCD Display

8. 1. Temperature Sensor Logic Heater Window Fan AC ALARM T<32oC On
Off
32oCT<34oC
34oC<T<38oC
38oC<T<48oC
48oCT<50oC
Tin>50oC

9. 2. Light Sensor

10. 3. Door and Window Sensor

11. 4. Transformer
Center Tapped : 220V-12/12-24V

12. 5. Motor
12 V Dc Gear Motor

13. 6. Motor Driver IC : L293D

14. 7. LCD Display LINE DISPLAY Inside Temperature Ti Line 1
Outside Temperature To
Line 2
No Of People Inside(1 Char-When enters/leaves)
% Power
Appliance Condition

15. Step 2 : Circuit Simulation and Design

17. Step 3 : PCB Design PORT SERVES AS PIN Name PIN No Connected To PORT A
All Input
PA0/ADC0 40
ADC (Power Level Detection)
PA1/ADC1 39
Temperature(OUT) Sensor
PA2/ADC2 38
Temperature(IN) Sensor
PA3/ADC3 37
Light Sensor
PA4/ADC4 36
Window Sensor
PORT B
All Output
PB0 1
Motor Driver(In1-2)-For Motor
PB1 2
Motor Driver(In2-7)-For Motor
PB3 4 AC
PB4 5
Heater
PB5 6
Motor Driver(In3-2)-For Fan1
PB6 7
Motor Driver(In4-7)-For Fan2
PB7 8
Fire Alert
PORT C
LCD Connections
PC3 – PC7
24-29
2Line LCD Display
PORT D
Occupancy Check
By Interrupt (INT)
PD2/INT0 16
Person In
PD2/INT1 17
Person Out

18. 3D Design of PCB

19. Complete PCB Circuit

20. DESIGN CONSIDERATIONS
LASER Sensor Instead of IR Sensor

21. PWM (Pulse Width Modulation)
DC Gear Motor Instead of DC Motor
Transformer
PWM (Pulse Width Modulation)

22. SYSTEM COST Total price of the system would be : 1620/=
Component
Price (Tk)
Microcontroller
AtMega32L
600/=
MOSFET
IRF 640 (4x30/=)
120/=
Potentiometer
(1X4/= + 3X4/= + 2X5/=)
30/=
Crystal Oscillator
8MHz
8/=
Capacitor
(22p, 2.2m) = 2x3/= + 10/=
16/=
LCD
2Line LCD Display
180/=
Motor Driver IC
(L293D)
80/=
LASER
(3X30/=)
90/=
Temperature Sensor
DS18B20 (2X150/=)
300/=
LDR
4x4/=
PCB
Print
250/=
Others
Diode,Resistors,Rail,Base etc
100/=
Total price of the system would be : 1620/=
Component
Price(Tk.)
Motor
DC Gear Motor
400/=
Fan
(20/=+40/=)
60/=
Transformer
Center-tapped 220V-12V
140/=
Building the Room
Wood,plastic,others
Total Project Cost : 2990/=

23. SYSTEM OPERATION TEST
As it was not possible for us to implement the control system in an actual office room we made a test room ourselves (as shown in the picture). (3 pictures) The program was made such that normal room temperature would serve as colder temperature when the heater would turn on and temperature was increased by a holding a soldering iron near the sensor. The occupancy check was done by placing our hands in front of the sensors to indicate people going in and out.

24. As it was not possible for us to implement the control system in an actual office room we made a test room ourselves (as shown in the picture). (3 pictures) The program was made such that normal room temperature would serve as colder temperature when the heater would turn on and temperature was increased by a holding a soldering iron near the sensor. The occupancy check was done by placing our hands in front of the sensors to indicate people going in and out.

25. The ADVANTAGES Automation Temperature Control Power Saving
Eco-Friendly
Versatile
No Human Required
Fire Detection
In System Programming
Low cost and Simple
Appropriate for BUET

26. Possible Additions to the System
Complete Fire Protection System
Security System
Presence Sensing Illumination
Common Digital Clock
Salary Calculation
Decision Making
Temperature Log

27. Thank You!