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FACULTY OF ELECTRICAL ENGINEERING
FACULTY OF ELECTRICAL ENGINEERING
FINAL YEAR PROJECT 1
(EEE 358)
CIRCUIT THREE HOUR TIMER
PREPARED BY :
1. MUHAMAD HAFIZ BIN ABD HAIRI
2013228802
2. MOHD ZULHILMI BIN MOHAMED YUSUF
2013487332SUPERVISED BY :
SUFIAN BIN MOHAMAD
1.0 INTRODUCTION
1.1PROBLEM STATEMENT
Battery manufactures recommend that the battery needs to be charged for three hours. Once the charging time is up the battery must be disconnected from the charger to overcome the problem of overcharging.
1.2 OBJECTVE
The objective from this project are to built a circuit for safety purpose. Once the battery are fully charged, this circuit will automatically disconnected. Furthermore, this circuit also can help to save more electrical energy.
2.0 PROJECT PROGRESS
2.1 LITERATURE REVIEWThis circuit, which sits between the charger circuit and its battery socket, prevents that possibility: the contact of relay Re1 interrupts the charging current when the three hours are up. Ten LEDs show the remaining charging time in steps of 20 minutes. The timer is reset each time power is applied and it is then ready for a new cycle. When power is applied IC3 is reset via C4 and R5. Since Q9 is connected to the active-low EN (enable) input, the counter will now remain in this state.
The charging time can be adjusted from about 2 hours 15 minutes to 4 hours 30 minutes using P1. The author set P1 to 30 k, giving a charging time of 3 hours 7minutes. The greater the resistance of P1, the shorter the charging time. The timing of the circuit is not particularly precise, but its accuracy is entirely adequate for the job. When adjusting the charging time it is worth noting that the rst clock cycle after the circuit is turned on (from Q0 to Q1) is longer than the subsequent ones. This is because initially capacitor C3 has to be charged to around half the supply voltage.2.2 METHODOLOGY
Components :a)IC 4017 An integrated circuit which has been designed to count pulses. It has 16 pins and looks like any other 16 pin integrated circuit. They can be used in timing circuits and are often used to switch on and off LEDs or motors or other circuits.
b) 741 IC operational amplifier is DC-coupled high gain electronic voltage amplifier with a differential input and usually a single-ended output. An operational amplifier produces an output potential (relative to circuit ground). In IC 741, 7 represents active terminals, 4 represents inputs and 1 represents input and 1 represent output.
c)IC 7812 Voltage regulator integrated circuits produce a voltage that is positive relative to a common ground and it will produce 12 volts of output.
d)Capacitor device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator.
e)Diode An electric device that restricts current flow chiefly to one direction.
f)Resistor An electrical component that limits or regulates the flow of electrical current in an electric circuit.
g)LED A semiconductor device that emits visible light when an electrical current passing through it.
2.3 CIRCUIT DIAGRAM
Figure 1 : Circuit Diagram 1 (Tina)
Figure 2 : Circuit Diagram 2 (website)2.4 BLOCK DIAGRAM
The block diagram shows that when the battery are fully charged in three hours, the LEDs will on and the circuit automatically off and there is no current flow in the circuit.
2.5 FLOW CHART
NO
YES
2.6 CIRCUIT SIMULATION
Figure 3 : Simulated circuit
2.7 PROBLEM ENCOUNTED AND WAYS TO OVERCOME THE PROBLEMS
There are problems that we had faced during the process of completing the project. One of the problems is we find it is difficult to find appropriate software to do the simulation because some of the software did not provide components in the libraries as we wanted. We managed to do the simulation by using TINA software. TINA software provide the components that we wanted.
2.8 EXPECTED RESULT
Figure 4 : Value of current and voltage through resistors
3.0 PROJECT PLAN
3.1 GANTT CHART
JUNEJULYAUGUSTSEPTEMBER
1234123412341234
BUY COMPONENTS
PROJECT TESTING
TROUBLESHOOTING
SIMULATION
PCB FABRICATION PROCESS
FINAL REPORT PREPARATION
FINAL PROJECT SUBMISSION
SLIDESHOW PRESENTATION
3.2 STRATEGIES
Our strategy for final year project for next semester are buying components, project testing, trouble shooting and PCB fabricating. These steps will be done in time that we have plan. All of the steps are need to be taken seriously.
Finally, preparation for completing the report is going to be done throughout the whole semester. The project have to be submit and we will present the project in front of the panels.
4.0 REULT
5.0 CONCLUSION
For conclusion, this project are not yet complete because for final year project 1, we only have to do simulation on software and present it in front of panels to make sure the circuit can run properly.
The objectives of the project are going to be achieve in next semester after the real simulation are done. We successfully solved the problem that occur in this semester to make sure that the continuation of this project for next semester is smooth and to avoid more problems.
6.0 REFERENCES
http://www.circuitlab.org/2011/07/circuit-three-hour-timer-schematics.html..
Battery charged
LED on & circuit break
Power supply
searching for project title
Make the prototype for the chosen title
Approval by supervisor
asupvisor
Finish
Gather all the components and equipment that required
Find the components to construct the circuit