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Obstacle Avoiding Robot Using Micro Controller
The document discusses an obstacle-avoiding robot that uses infrared sensors for detecting obstacles and navigating autonomously. It details the architecture of the 8051 microcontroller, the working of an H-bridge motor driver for controlling motor direction, and provides an algorithm for robot operation. Additionally, it outlines the advantages and disadvantages of the robot's design and potential applications in various fields, including toys and military use.
Obstacle Avoiding Robot Using Micro Controller
- 2. INTRODUCTION Robot is acomputer-controlled machine that is programmed to move manipulate objects, and accomplish work while interacting with appropriate sensors and actuators mounted on it for carrying out the desired operations. In this robots Infra red pairs are used for sensing the obstacles and IR leads are used for transmitting and receiving infra red rays. Using infrared rays robots will find out the obstacles present in front of them and move right or left from their current position and move forward.
- 3. Obstacle detection robotsare nothing but self thinking robots which can take decisions itself using programmed brain without any guidance from human beings. There are two types of robots in one type robots perform action as we give signals remotely where as second type of robots are self thinking robots which can detect obstacle and move forward. This project is of second robots.
- 4. Graphical Block diagram: ObstacleAvoiding Robot
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- 7. OBSTACLESENSORS The obstacle senoris used to avoid the robot from the clash to any external devices (or) that is like walls, any obstacle which comes in its way. Here we are using the IR communications .the transmitter and the receiver parts. The transmitter produces the IR rays and they are received by the receiver section.
- 8. Architecture of 8051Microcontroller Features RAM 128bytes ROM 4K I/O 4 ports Timer 2 Interrupt 6
- 9. Pin diagram ofIC AT89C51
- 10. MANUFACTURE S OFMICRO CONTROLLER Atmel Dallas Semiconductor Intel Microchip National Semiconductor Texas Instruments
- 11. H-BRIDGE MOTOR DRIVER Thename "H-Bridge" is derived from the actual shape of the switching circuit which controls the motion of the motor. It is also known as "Full Bridge". Basically there are four switching elements in the H-Bridge as shown in the figure below.
- 12. Truth Table High LeftHigh Right Low Left Low Right Description On Off Off On Motor runs clockwise Off On On Off Motor runs anti-clockwise On On Off Off Motor stops or decelerates Off Off On On Motor stops or decelerates
- 13. Logic Table ofthe Circuit Direction P0.0 P0.1 P0.2 P0.3 Forward 1 0 1 0 Backward 0 1 0 1 Right 1 0 0 1 Left 0 1 1 0
- 14. Electrical motor An actuatorwhich converts electrical signal into rotation”.
- 15. Why only DCmotor? We all know that AC motors are normally constant speed motors. Variable speed ac drives uses very complex circuitry because the ac motor speed is varied by the frequency variation and is not quite easy. Stepper motor gives calculated angle of rotation they take number of steps in one revolution they cannot be stopped in between the step. Also they are not constant running motors their use is limited to the area where you want calculated steps to be taken such as printers, plotters, and other similar applications.
- 16. Advantages of DCmotor:- Dc motors are widely used in industry where wide range of variable speed is required. High starting torque & easy speed variations are some of the other characteristics of DC motors.
- 17. ALGORITHM Step1: Initialization ofI/O ports. Step2: Set Direction as Forward/ Backward/ Left/ Right. Step3: check if any obstacle is detected according to that change the motion of Robot. If no then Robot will goes in forward direction. Step4: Wait for some time. Step5: go to step 3 to repeat the process. Step7: Wait for some time. Step 8: End
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- 19. Advantages & Disadvantages Advantages: Whenever robot senses any obstacle automatically diverts its position to left or right and follows the path without human guidance. The programming of the microcontroller is easy. It is a low cost circuit. Disadvantages : It is time consuming project. It is use for short distance only. It is not recommended to keep the range very long because this would cause the ROBOT to keep moving forward and backward as it senses any obstacle, even far away from it. It is not in human control
- 20. Applications Obstacle sensingrobot can be applied at the toys where small children will play. It can used for the army application. We can apply number pairs of IR pairs for the safe direction control of the robot. In Mines.
- 21. FUTURE ASPECTS: Wecan extend this project with wireless technology by IR (or) RF. This robot can be used for pick and place the required object by giving directions to the robot but IR pair should be replaced depending upon the application. By doing extra things, it can be use in Army application.
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- 23. References BOOKS: 1.The 8051microcontroller & Embedded System ( Mazidi , Pearson Education ,III edition) 2.Mechatronics Principle and Applications (Godfrey Onwobolu, Pearson Education) 3.Embedded System ( Rajkamal, Pearson Education, II edition) 4. .Introduction to Robotics (Vikram Kapila, Pearson Education,IV Edition)
- 24. Website: http://mechatronics.poly.edu http://www.roboticswikipedia.com http://www.mecatronicswikipedia.com http://www.datasheets.com http://www.J2RScientific.com http://www.expresspcb.com http://www.kiel51.com http://www.8051microcontroller.com