Figure below shows the relay circuit: Figure 3. For this purposes several material had been prepared such as two play wood, magnetic lock, nail, screw driver and steel.
Before start built the door prototype, a design for this was sketch in order to give some idea and for the improvement for next time reference. Some of the works are cutting the wood, make a hole to the steel, put and hold the magnetic lock to the steel in order to attach it to the door lid.
This works contribute to the creative thinking and problem solving technique to finished. Below are some view of the prototype, Figure 3. The component was plan according to the need of the project. This software was used because it is suite to the chip. THRSIM simulator was user friendly software because the simulation can be implemented through the software after the program written by the user. It has features such as led, switch, traffic light, serial communication receiver and transmitter and so on.
This features can be used according to the program that suite to the objectives that user want. This menu provides the user a task that they want to use. This helps the user while programming the project.
For this project, the signal from the phone must be read by the microcontroller and then verified it and lastly on the output if the right messaging was send by the user.
Figure below shows the transmitter for this simulator. This transmitter will shows that the data that will send by the phone to the microcontroller. The data was send serially and one by one from the left side to the right side. For user to open the door inside the door they need to push the switch inside the room to release the magnet for the lock.
This software also develops by the Motorola Company in order to load the program that has been written by the programmer to the microcontroller chip. Using this software enables to load the program using the boot loader techniques. Boot loader techniques means that the microcontroller chip can be program directly using the computer through the serial port.
The only need is the serial port and the serial interfacing circuit that was implementing before. The serial ports which are transmit TX and received RD port was connected to the serial port interfacing circuit and from this circuit the DB9 connector was connected to the serial port of the computer.
After the voltage supply was feed, the reset button at the microcontroller circuit was press. The green light from the HCload was display and this means that the microcontroller board was properly and can be used to implement this project. Although this was the constraints it still not effect because the program written is not exceed the memory that was allocated by this software. The method was implemented by using the hyper terminal software which comes directly with the Microsoft software.
This means that a connection between the phone and the computer was made. This is to make sure the correct port that the phone and the computer is connected together. Baud rate means the speed of transfer rate for the data from the phone to the computer. For this connection bps connection was used because this connection was suitable for the phone. First the code AT was sends through the hyper terminal. This means that the phone support this type of command.
The command known as AT-Commands. AT means attention. After that, then the command to read the message from the first memory of the phone was send. And the response from the hyper terminal was shown before. It is the string type of data. To convert this data in order to identify the actual data is firstly the data is divided in two section which every section include two character. After that, convert the two separated section to its binary value.
This project was used the assembly language to develop the program that suite to the objectives. Most communication applications have user interface that hide the AT commands from the user. AT Commands can be relate via a communications application. When the phone has received an AT command, it respond with message that is displayed on the screen of the used device which in this case is hyper terminal.
There are many ways of AT Commands that suite to the user need. User can check the phone number, read and send text message, delete message, check the service center number, select phone memory and many more through AT Commands. This sign is compulsory in order to use the commands. Some of the AT Commands that was used in this project are: AT : This command must be entered in order to check whether the phone support this command or not.
For the voltage regulator circuit, it successfully work which enable to supply the continuous fixed 5 Volt to the other circuit that used in this project. Since the regulator was built from LM chip, he maximum voltage input for this chip is 24V. This chip LM were used because of the capability to supply the positive 5 Volt continuously.
The red led was used as the indicator to indicate that whether there is voltage output from the regulator or not. If the led is shows the red light, this means that there is output voltage from the regulator circuit. As an additional component to the regulator circuit, two capacitors were connected each at the input and output of the LM chip. This is to make the voltage input to the regulator and the output voltage are stabilize without any dissipation. This microcontroller has been tested in order to make sure it can receive the program written or not.
For this microcontroller it works with the 5 Volt as a supply to the chip. Attached at this circuit are two button, red led, output port pins, oscillator, capacitor and resistor.
Figure 4. Next when the transmit and receive port are connected to the serial interfacing circuit and checking using HCLoad software, the green light of the software shows at the monitor screen as the reset button was pressed.
This means that the microcontroller circuit is properly functioning. This serial interfacing circuit is used to load the program that has been written to the microcontroller chip. The serial interfacing circuit is connected to the computer by using the DB9 connector. This circuit was built because of to release the magnetic in order user open the door.
The magnetic lock at initial condition was in the lock condition. In other words the relay condition the initial state is normally closed. After the right message was send by the user, the microcontroller will trigger the relay to the normally open. This means that the magnetic effect was enabled. The concept of putting the transistor to the relay is that implement the transistor as a switching device.
The wood was obtained from recycle shop at Taman Universiti. The design work has been done first in order to create a good prototype which can be equal as an exact situation.
The door consists of the lid, handle, frame of the door and lastly is the magnetic lock which is attached to the steel that hold the magnetic lock. The door was properly design and lastly the result is that a good prototype of door lock was built.
Also from this project, searching for information from a various sources skills also has been learned. To know the characteristics of the microcontroller, the data sheet is an important reference for this. In the data sheet all the characteristics of the microcontroller was obtained.
Besides, the programming skills require the critical and creative thinking in order to write the program. There is on problem encountered which is the microcontroller cannot read the message from the phone and function as needed in the first objectives. Searching for the problem was done to detect where the problem is. From the simulation that has been done using the THRSim11 simulator, it shows that after the microcontroller read the data from the phone, it will store the data in the memory inside it.
But after testing with the real hardware the situation is not same with the simulation that has been done. The problems are: i. Difficulty looking for the suitable phone that suite to the project objective.
There are two different model that are Nokia and Sony Ericsson model. Problems on find the suitable data cable in order to connect the phone to the microcontroller. Solution: Ask a friend that was doing the project that will use the SMS concept. Finally the cable was found and can be used in this project. Hardware of microcontroller circuit was enable to work properly at first Solution: Do the troubleshooting work over and over.
Using the multimeter to check the voltage supply whether it is supplied or not. Finally, the microcontroller circuit was properly functioning. As the need was demanding nowadays, this system was built in order to meet the demand in the security system. The Automatic Door Lock System was built in order to help user in opening their door without using the key.
This system using short messaging system SMS in order to open the door. This concept gives the additional features in the security system as well as to help the consumer for more security of their life. In this project, the objective that learning the SMS technology has be met. This knowledge can be implemented in more complex system later. Besides, through this project a lot of skills have been develop not only in the software and hardware skills but the capabilities of searching for important data also have been learned.
Signals Display A suitable display for lock and unlock condition could be made in order to enable user to know the condition of the door whether it is in lock condition or not. Charging Port A charging port for the phone could be made in future in order to charge the phone in case of it battery does not have the supply. Daniel J. Black Pg Jan Axelson Pg 1- Jonathan W.
Motorola Inc The MC68HC11 reference manual. Nurhuda bt Zahari , Automatic Fire Alarm. Universiti Teknologi Malaysia:Bachelor. Thesis 7. Looking for a perfect solution for combining multiple pdf documents together, don? Acrobat pdf page The utility Freda to read various types Adobe Acrobat Pro DC Reader This e-book reader Icecream Ebook Reader Calibre I' Windows Mac.
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