Download - Autonomous Metal Detector Vehicle (AMDV)

Autonomous Metal Detector Vehicle (AMDV)

Jared SpeerLamar Williams Jr.

Nathan StephanUniversity of Central

OklahomaDepartment of

Engineering and Physics

Fall 2011

Design Outline

• Brainstorm• Research• Feasibility assessment• Conceptualization• Establishing the design requirements• Preliminary design• Detailed design• Production planning and tool design• Production

Brainstorm

• As an team deciding the actual project was an project of itself

• Other ideas included:– War Robot– Remote controlled car– Underwater boat (Submarine)– LCD display– Autonomous Metal Detector

Brainstorm

• As a team we decided that the AMDV sounded the most interesting and rewarding project, but it also sounded the most intimidating project

• To verify the project was feasible, we had to conduct research

Design Outline


Research• We performed research on an myraid of different aspects of the AMDV

• Aspects of the AMDV included– Hall Effect sensor– Parallax PING Ultrasonic Sensor– Vehicle Body

• Chassis • Body• Suspension

– Microcontroller• Basic Stamp 2sx

– Sensor• Parallax Ultrasonic Ping Sensor• Metal Detector

– Design of the Sensor– Understanding of Sensor

– Programming• Synching all of the different aspects of the AMDV to work coherently

Design Outline

• Brainstorm• Research• Feasibility assessment• Conceptualization• Establishing the design requirements• Preliminary design• Final design• Cost

Feasibility assessment

• After research, we deduced that this will be a challenging but achievable project

• Since the AMDV idea was seemed so interesting, we decided that pursuing this project would be the best route to take.

Design Outline


Conceptualization(Preliminary Design)

Conceptualization(Preliminary Design)

Schematic of the *final* preliminary design

If we proceed in this design, it would not be autonomous

Conceptualization

• That design was our final design that was in line with our feasibility requirement.

• We needed to make sure that it met the design requirements of the professor outlined in his project requirement list.

Design Outline


Establishing the design requirements

• Dr. Baha and Mr. Richard gave us specific requirements for us to abide by

• We covered all of the requirements given in the Term Project Guidelines as shown in a list in the following slide

Establishing the design requirements

• Output Display – Parallax Serial LCD

• Audio Output Device– Speaker with 5ohm 4watt specs

• Manual Data Input – On/ Off Switch– Timer to shutdown once metal is detected, automatically switches off

• Automatic Sensor Input – Parallax PING Ultrasonic sensor– Metal detecting sensor

• Actuators, Mechanisms, and Hardware– DC motor– Stepper motor– Suspension System – RC servo motor

• Logic, Processing, and Control– Basic Stamp 2SX– Programmed Logic

Design Outline


Preliminary design

If we proceed in this design, it would not be autonomous

Preliminary design

• Due to time constraints, we realized that building a chassis, suspension system for various terrain, and space for the circuits we had to outsource the body

• We reversed engineered a RC car from New Bright.

Preliminary design

By using this car, we already had the suspension, chassis and space for all of our circuits.

Preliminary Design(Metal Detector)

• The original design that we used was going to be the use of the hall effect sensors

• Even though we thought that it would be an feasible venture, it would not be feasible with the time constraint

Preliminary Design(Metal Detector)

• The design that we decided to use was the much simpler BFO (beat frequency operation)

• This design had to be modified to fit our specific parts.

http://thomasscarborough.blogspot.com/2011/10/bfo-metal-detector.html

Preliminary Design(Testing and Debugging)


• Our team actually burned the motor driver L293D due to insufficient knowledge of how much voltage was needed to go in.


• So we built an voltage regulator. This was the schematic of the voltage regulator. It regulates the voltage that goes into the motor driver (L293D).

http://freedatasheets.com/datasheetblog/tag/voltage-regulator/


• Our team was obtaining inconsistent readings from our metal detector.

• We realized that our speaker was very close to the circuitry and metal detector.


• Since the magnet within the speaker produces an magnetic field, it was causing interference in the reading we obtained.

• We rectified this problem by moving the speaker away from the circuitry.

Preliminary Design(Components)

• We used the Parallax Servo Motor to steer the AMDV either left or right

• The Parallax sensor worked great in this project


• We used the Parallax Ultrasonic Distance sensor for the AMDV to avoid collisions

• It used short ultrasonic burst to and provides an output pulse that corresponds to the time required for the burst echo to return to the sensor

• By measuring the echo pulse width, the distance to target can easily be calculated


• This is the DC motor that provides the rear wheel drive acceleration to the motor

• We switched motors due to the first motor we used was malfunctioning


• We went through the trouble of trying to figure out exactly the best coil possible.

• 24 gauge copper wire and wrapped it 70 times with an inner diameter with an inductance 1.25 mH.


• The LCD is integrated into the AMDV to communicate to the user what it sees.

• It tells you the intensity of the magnetic field and to reset it to find metal.

Design Outline

• Brainstorm• Research• Feasibility assessment• Conceptualization• Establishing the design requirements• Preliminary design• Final design• Cost

Final Design(Pictures)

Final Design(Schematic)

Final Design(Pictures)

Estimated Cost• Output Display

– Parallax Serial LCD = $ 40• Audio Output Device

– Speaker with 5ohm 4watt specs = $25• Manual Data Input

– On/ Off Switch = $2 • Automatic Sensor Input

– Parallax PING Ultrasonic sensor = $20– Metal detecting sensor = $20

• Actuators, Mechanisms, and Hardware– DC motor = $20– Suspension System = Donation– RC servo motor = $40

• Logic, Processing, and Control– Basic Stamp 2SX = $60

• • Total Cost = $ 227.00