Project Proposal for Computer Controlled Using Interfacing

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					Computer Controlled
     Senior Design Project

                        Author: Chi Yeuing
                                 Aman Negus
                                 Andre Lam
                        Advisor: Dr. Zecevec
                        Project Proposal
                        Nov. 30, 1998
                          Computer Controlled Robot
Project Goals

       Our goal for the senior design project was originally developed from the thought

of creating a micro-robot, a robot that finds its way in a maze. But since this project was

accomplished by last year’s class, we set out to do something more with the robot. This

Robot is going to be controlled from a computer with a wide range of functions that we

are going to be discussed below.

       The robot will be controlled from a computer terminal. The user can use the

computer to control as many as 17 functions by using different keys on the computer and

the joystick. The joystick or keys on the computer tell the robot to move forward or

reverse, turn right or left, or stop. Some keys enable the robot to produce sound effects

thorough a built-in piezoelectric speaker mounted on the robot. And other keys flash the

robot’s LED headlights.

       The Robot also has an onboard 16-Kilobit, non-volatile memory that enables it to

remember movement sequences. There are six selectable memory banks, each with 127

steps of memory. This means that we can have the Robot repeat its movement and

produce sound effects automatically. We can store six sequences each with up to 127

steps and, with a press of a button, the Robot will replay the sequence. Sequences are

stored and remembered even if the power is temporarily turned off or the batteries die.

       The on-board infrared receiver is sensitive enough for a control range of up to 25

feet. We are also planning to put a video camera on the robot and sending the video

signal on the robot to computer so that the user knows what exactly the Robot is heading.

But this part is only implemented if time permits. We can also select two speeds: a high
range and a low range. As a credited class at Santa Clara University, our senior design

has some additional constraints. We must fully document our progress to assure that we

have learned the proper procedures for the original design of the Robot and successfully

performed them.

       Lastly, we have our self-assigned requirements. The three of us want to make

certain that our project is a sufficient challenge and that the final product will be

something in which we can be proud of. This decision, which we recently came to, has

changed the scope of our project to the construction of our own transmitter-receiver, and

the Robot, as opposed to purchasing a pre packaged transmitter-receiver and interface it

with a computer.


       In these days people don’t have enough time to do the house-works such as

mowing the lawn because of having busy working schedule. In such a case a smart robot

becomes very handy. Therefore, we developed an idea to build a robot that does more

than just move in a maze. Since making the robot that can memorize up to six sequences

can help in fixing the boundary limits of a lawn mower. With up to six sequences, this

designed robot can be used in a wide range of areas with different helpful purposes. For

example, the robot can be programmed to help elderly person or patient such as being a

reminder or medicine giver.

       Having a video signal makes this Robot very useful as a vehicle used for

searching and exploring places that human being is limited to such as detecting mines and

exploring the unsafe environment.      Controlling the robot from different computer
terminals through the internet gives the user flexibility to access it from any computer

terminal at any place.

Possible Approaches

       In order to design the Computer-Controlled-Robot, we have considered some
possibilities in designing approaches. There are three major parts:
       1. The micro-controller (for robot)
       2. The wireless transmitter-receiver (between robot and computer terminal)
       3.   The video signal if time permits (between two computer terminals)
        Each major part is guided by two approaches: a first choice and backup plan. In

part 1, we can use either the micro-controller PIC16C622 or 87C752. Even though we

have experienced with the 87C752, we choose to use the PIC16C622 because this chip

satisfies our need and is easy to find on the market. In part 2, we will build the wireless

transmitter and receiver. This approach is selected because we want to build devices that

meet our specifications and to make interfacing with other devices (micro-controller and

computer terminal) easier. The second approach is to purchase the set (transmitter and

receiver) in case of facing difficulty. The video signal in the last major part is considered

to be optional. If time permits, we will try to transmit the video signal from the robot

indirectly to the third computer terminal. This task can be accomplished by software,

using either the PC-Anywhere or SDK.252 (SDK.252 is sponsored by ACER LAB). Our

choice is the SDK.252 for the supporting of ACER LAB.

The Circuit

       The “brain” of this robot is a Microchip Technology PIC16C622 eight-bit CMOS

micro-controller with built-in EPROM. The PIC16C622 is housed in an 18-pin DIP

package that contains a central processor, EPROM, RAM, a timer, and 13 TTL/CMOS-

compatible input/output lines. The micro-controller is interfaced with the receiver.
       The transmitting signal from the transmitter to the receiver is by using an infrared

light. The commands will be sent from the transmitter that is interfaced to the computer

terminal to the receiver on the robot. The receiver module outputs a low-level TTL-

compatible signal whenever it receives a pulse of infrared light. Therefore, whenever a

button is pushed or the joystick is pushed to one direction, the receiver module outputs a

serial bit-stream unique to that particular button. The receiver module then feeds the bit

stream to micro-controller input. Then this input informs the micro-controller what

action to take.

       The transmitter we are going to use for this design will generate IR (infrared) light

pulses at a frequency of 320-Hz. The pulses arrive at the collector of the phototransistor

and are amplified by a 2N2222 transistor. An NE567 is tuned to 320-Hz, so if pulses of

any other frequency arrive at the phototransistor, the NE567’s output will remain high.

When the 320 Hz signal enters the phototransistor, the NE567 recognizes this frequency

and puts its output low. We can change the operating frequency since NE567 will work

between 100Hz and 1kHz.

Description: Project Proposal for Computer Controlled Using Interfacing document sample