EMB 772 Spider Robo Wi Fi

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SPIDER ROBOT

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WI-FI DATA TRANSMISSION

Robotics is the science and technology of robots, their design, manufacture, and application. Robotics requires a working knowledge of electronics, mechanics and soft-

Rhydo Technologies Pvt Ltd.Golden Plaza, Opp. Mymoon Theatre, Chitoor Road, Cochin –682018, Kerala State, South India

Phone: +91-484-2370575/6/9, +91-484-3258390 E-mail: [email protected] Visit: www.rhydo.com

SYNOPSIS

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ware. Although the appearance and capabilities of robots vary vastly, all robots share the features of a mechanical, movable structure under some form of autonomous control. The structure of a robot is usually mostly mechanical and can be called a kinematics chain. The chain is formed of links (its bones), actuators (its muscles) and joints which can allow one or more degrees of freedom. The mechanical structure of a robot must be controlled to per-form tasks. The control of a robot involves three distinct phases - perception, processing and action.

This project develops a Spider Robot used to explore a remote location by sens-ing the parameters like humidity, pressure, light, temperature etc processes it and transmit the collected data to the control station using Wi-Fi Communication. The robot can also detect the object/obstacles in its path by verifying the output from the Sensors. This project consists of a microcontroller section and mechanical section. The microcontroller section stores a program that controls the movements of the robot, parameter sensing and object/obstacle detection. The mechanical section consists of servo motors for the move-ments of robot.

This project helps in monitoring the various parameters of a particular loca-tion. The robot is fixed with various sensors that monitor temperature, light, relative humid-ity and pressure. The results are automatically archived on each time interval. These pa-rameters are sent to the monitoring station at definite intervals using Wi-Fi. This project is helpful for the military/ space expedition etc to verify the atmospheric situations in a particu-lar area without any human intervention.

A robot is a mechanical device, a manipulator designed to perform many different tasks and capable of repeated, variable programming. To perform its assigned tasks, the robot moves parts, objects, tools, and special devices by means of programmed motions and points. The object is detected by using Infra Red/Ultrasonic transmitter and receiver. If the distance of the object found by the system is less than the predefined value, the system changes the path of the robot.

Robot has a motor- driven mechanical device and a brain in the form of a computer or a microcontroller that controls its movement. The microcontroller stores in its memory a program detailing the course the device follows. When the program is run, the controller



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sends signals activating the motors which move the robot. The controller is that part of the robot which operates the mechanical section and maintains contact with its environment.

The embedded system software includes the interfacing of the sensors like tem-perature sensors, light sensors, humidity sensors and pressure sensors etc. to the micro-controller. The sensors give analog outputs and they have to be converted to digital values for processing. An external ADC or more preferably an internal ADC (in microcontroller) is used. The microcontroller, which is the controlling device regularly, reads the sensor out-puts. A proper communication protocol (Wi-Fi) has to be established for communication be-tween the control room and the remote system.

The data transmissions are done through a Wi-Fi network which is a new technol-ogy in wireless transmission and are now widely implemented in laptops, video game con-soles, home networks etc which works in a radio frequency of 2.4 GHz. Wi-Fi means Wireless Fidelity is a popular wireless networking technology that uses radio waves to provide wireless high-speed Internet and network connections. The Wi-Fi Alliance, the organization that owns the Wi-Fi (registered trademark) term specifically defines Wi-Fi as any "wireless local area network (WLAN) products that are based on the Institute of Electri -cal and Electronics Engineers' (IEEE) 802.11 standards."

The most common wireless technology standards include the following:

- 802.11b: The first widely used wireless networking technology, known as 802.11b (more commonly called Wi-Fi), first debuted almost a decade ago, but is still in use.

- 802.11g: In 2003, a follow-on version called 802.11g appeared offering greater perfor-mance (that is, speed and range) and remains today's most common wireless networking technology.

- 802.11n: Another improved standard called 802.11n is currently under development and is scheduled to be complete in this year (2009). But products based on the draft 802.11n standard are now available, which will be able to upgrade later to the final standard.

Wi-Fi works with no physical wired connection between sender and receiver by using radio frequency (RF) technology, a frequency within the electromagnetic spectrum associated with radio wave propagation. When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space. The corner-stone of any wireless network is an access point (AP). The primary job of an access point is



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to broadcast a wireless signal that computers can detect and "tune" into. In order to con-nect to an access point and join a wireless network, computers and devices must be equipped with wireless network adapters.

If the system is enhanced with a digital camera, the image of the surroundings can be sent by the robot. Thus this project can be used in space exploration where the robot functions without human interference. The environmental parameters can be sensed by the control station using the wireless receiver module. Hence this robot resembles rovers (ro-botic exploration vehicles), the robot that made a series of missions to Mars.

The control station PC with internet connection interprets the incoming data from the microcontroller transmitted via Wi-Fi, and displays the needed data in corre-sponding web pages. For this purpose we develop application software using Visual Ba-sic/HTML/ VB.NET/ASP.NET.



Block Diagram

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1) Electronic circuit design, Schematic Design, PCB Design2) Microcontroller programming using Assembly /Embedded C3) Debugging skills4) Memory Interfacing5) Driver Interfacing for robots6) LCD Interfacing7) Artificial Intelligence Implementation8) Distance Sensor interfacing9) Control commands for Wi-Fi10) Wi-Fi Wireless Communication Protocol 11) Visual Basic/ VB.NET/ASP.NET/HTML

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Skills Implemented

EMB 772 Spider Robo Wi Fi

Documents

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