1. By: DESMOND LAI CHENY YIN
Student ID: 52931
Supervisor : MR MATTHEW TEOW

2. GSM ACTIVATED ELR

3. OBJECTIVE
Implement and design the GSM activated ELR.
To study the communication between GSM modem
with microcontroller.
To study communication of GSM system using AT
command.
To study the setting of the residual current.
To protect electrical/electronic device from burning
cause by thunder.
To reduce the food waste cause by power tripped.

4. 1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble

5. Project
implementation
1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble
Try getting idea to overcome
the problem below
House tripped for few days
refrigerator foods forced to
be trow
Power tripped, fishes in the
aquarium die

6. Project
implementation
1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble

7. Project
implementation
1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble
Do search and choose the
most suitable component to
be use in this project
Decide programming
language

8. Project
implementation
1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble
Learn basic programming using
HI-TECH C language
LED blinking
Uart communication
AT command

9. Project
implementation
1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble

10. Project
implementation
1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble
Test part by part following the
schematic in breadboard

11. Project
implementation
1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble
Design pcb board according to
the schematic by using
EAGLE software and etching
is done by manually

12. Project
implementation
1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble
Drill holes for the fitting of
the components after this
process follow by solder
components into the PCB
board

13. Project
implementation
1. Expend project idea
2. Forming flow chat
3. Choosing component
4. Learn programming
5. Circuit design
6. Testing breadboard
7. PCB design
8. Drilling and soldering
9. Final assemble
Assembly all PCB board,
transformer and ELR into DB
board and casing

14. The testing of the project was successfully done and its
functioning well, the following slides shows the test result steps
by steps.

15. Results And
Discussion
Turn on the device

16. Results And
Discussion
Wait all 3 led stable

17. Results And
Discussion
Press the ELCB tester so the
ELR detected residual
current and trip happens

18. Results And
Discussion
Status LED changed red
Sms successful received on
the phone

19. Results And
Discussion
Replying the system to reset
the ELR

20. Results And
Discussion
ELR reset and status message
is received and finally the
status led change back to
green

21. This project was focused on the implementation of GSM
activated ELR was presented successfully. All objective in
chapter 1 were achieve. The system is quite stable .