L298N circuit diagram

This is a L298N circuit diagram that I used to controlled the servo motor

circuit design for PIC

This is example for PIC schematic that I used for this prject

DUAL FULL-BRIDGE DRIVER L298

The L298 is an integratedmonolithic circuit in a 15-lead Multi watt and PowerSO20 packages. It is a
high voltage, high current dual full-bridge driver designed to accept standard TTL logic levels anddrive
inductive loads such as relays, solenoids, DC and stepping motors. Two enableinputs are providedto
enableor disablethe deviceindependentlyof the input signals. The emitters of the lower transistors of
each bridge are connected togetherand the corresponding external terminal can be used for the connection of an external sensing resistor. An additional supply input is provided so that the logic works at a lower voltage.

Progress between 18 October to 30 October 2010

The work plan highlighted of the preparation of the Presentation slide, preparation of final year project report which only consists of Chapter 1, 2, and 3 alongside with the preparation of the progress report. During this time period, In the preparation of the Presentation slide, The previous data and research about The miniature robot with Servo-powered legs is reviewed back. The Information gather is been review and extra research is done to gain better understanding about what is going to be presented. For Semester 1 in the final year project, students are required to completed the report of chapter 1, 2 and 3 which represent the Introduction, Literature Review and the Methodology. The progress report is more like a logbook but highlighted on the work being done and what problem that the student face doing the said work with the corrective action taken to counter those problems. The progress report will also enlist the work that must be done in the future and what to expect during the duration of this project.

Problem Faced

The presentation slide had cause a problem in the start as we had no idea on what is being assess in the presentation. The presentation is only 15 minutes and on what manner that this presentation is going to be.

Solution

After consulting with the advisor, the presentation slide as the main components of information transfer and the two accessors is going to be there at Gemilang Hall at the specific time which is being arrange by the final year project committee. The advisor also highlights us on what need to be in the presentation and prepared to answer predicted questions thrown by the accessors.

Progress between 20 September to 17 October 2010

During this time period, discuss with advisor, and make final prototype of robot. It had come during this time that the presentation slide for final year project presentation is also made. Final prototype robot which is have four (4) legs with using two (2) servo motor. The size of robot around 10cm x 7cm.

Problem Faced

The prototype had cause a problem. researcher had no idea on how to build the design of robot

Solution

The problem is handle by see advisor to get see advice from him and get some information from the internet.

Progress between 21 August to 19 September 2010

 During this period, we had focus on the hardware of the project that is the Development of miniature robot with Servo-powered legs. The hardware that are in focus during this period are the servo motor, check degree of freedom (DOF), and prototype of robot. During the research, Servos contain a small DC motor, a gearbox and some control circuitry, and feed on 5 volts at about 100mA maximum, and about 10-20mA when idle. They have a three-wire connector, one common wire (0 volt, usually black), one +5v wire (usually red), and one signal wire. In normal use they are controlled by pulses of about 1 to 2 milli-seconds at a repetition rate of about 50 per second. A short pulse makes the servo drive to one end of the travel, a long pulse makes it drive to the other end, and a medium one puts it somewhere proportionally between. Some servos have gear components that allow them to rotate continuously. Using a Radio Controlled (RC) servo for steering is a good method, because the position of the steering mechanism is determined by the length of the servo drive pulse, which can be generated by a software countdown loop or a hard-ware counter. If an RC servo is used as a drive motor, wheel motion sensors are needed on at least one wheel as in any DC motor system. The use of an RC servo for driving only simplifies the mechanics. In summary, servos are very small and precise motors. Degrees of freedom is a general term used to express dependence on parameters, and implies the possibility of counting the number of those parameters. In mathematical terms, the degrees of freedom are the dimensions of a phase space. Robot arms are often categorized by their degrees of freedom (typically achieving more than six degrees of freedom). This number typically refers to the number of single-axis rotational joints in the arm, where a higher number indicates an increased flexibility in positioning a tool. This is a practical metric, in contrast to the abstract definition of degrees of freedom which measures the aggregate positioning capability of a system.

Problem Faced

The selection of the hardware seems to take more that the proposed timeline. This is due to other assignments need to be carried out other than to focused on the project.

Solution

The problems is handle by speeding up the research pace for such using the common manufactured component available in the market that meet the specific requirement of this project. Cytron Technologies for example offer many sets of component with detail explanation on what can we can expect by their supplied components such as the users manual and the data sheet. They also make a couple of suggestion on what combination that those component fits in.

Progress between 18 July to 20 August 2010

During this time, the first meeting of final year student is held at dewan gemilang to give a brief explanation on the purpose of the final year project by the final year project committee. The meeting also explain the important dates that comes during the semester such as the dateline of the proposal, submission of reports and presentation day. After the meeting, students are required to choose the title of their final year project. The options are either choose the title that had been suggested by lecturers in the final year project portal or come up with the project of their own. After some research on the internet and couple of suggestion by others, development of miniature robot with Servo-powered legs to be a good project to begin with. Selection of advisor is then made and Sir Zukhairi Bin Mohd Yusof is to become their after advisor of the proposed project.A proposal explaining the proposed project is sent to the advisor to be reviewed and approved as a valid project. After getting the approval, the project will be proceeding to the next level that is the research.

Problem Faced

During this period, only one problem is faced, that is the selection of the title of the project. It had come that a room system is common these days and what can we added to the system to make it unique and worth the research for.

Solution

A unique value is found when we had a research in the Final year project portal as we look at the proposed title by the lecturers and title such as Development of miniature robot with Servo-powered legs is available. Therefore development of miniature robot with Servo-powered legs idea is develops.