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Switched-Controlled Turntable. Name: Dean McDonnell Supervisor: Dr. Maeve Duffy. Objective of Project. To Design and Build a Switch-Controlled Turntable Controlled through an infra-red remote control Full 360 degree turn, bi-directionally Stepped in 90 degree angles

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switched controlled turntable

Switched-Controlled Turntable

Name: Dean McDonnell

Supervisor: Dr. Maeve Duffy

Electronic Engineering Final Year Project

objective of project
Objective of Project
  • To Design and Build a Switch-Controlled Turntable
  • Controlled through an infra-red remote control
  • Full 360 degree turn, bi-directionally
  • Stepped in 90 degree angles
  • Addition to project includes a second motor
  • Design Issues: Fit under assortment of beds and Portability

Electronic Engineering Final Year Project

previous design
Previous Design
  • Another version designed and built in the USA
  • Two students from University at Chapel Hill
  • Use by children with severe and profound disabilities at Lake Wood Elementary School
  • Children were unable to retrieve toys independently
  • They could not choose between items when presented multiple options
  • Table required auditory, visual and tactile feedback
  • Needed to fit the needs of a variety of children
  • Named “The Lazy Susan”

Electronic Engineering Final Year Project

building of previous design
Building of Previous Design

Electronic Engineering Final Year Project

previous design1
Previous Design
  • Advantages were immediately noticed
  • Allows access to multiple toys from a single location
  • Consists of partitions used to segregate the toys from one another
  • LED’s and spoken messages are also integrated
  • Provide visual stimulation and auditory feedback
  • Very important for teachers, therapists and children

Electronic Engineering Final Year Project

operation of previous design
Operation of Previous Design

Electronic Engineering Final Year Project

initial step
Initial Step

Infra-Red Execution

Infra-Red Receiver

Microprocessor

Motor Drive

Motor

Table

Electronic Engineering Final Year Project

finding the motor
Finding the Motor
  • Stepper Motors were a must
  • Datasheets of different motors researched
  • Tests carried out on different motors
  • Results had to show that motor is capable of rotating a mass of 5 kilograms
  • Also needed to be cost effective
  • Rotate the mass within approx. 7 seconds without exceeding 12 volts
  • Minimal stopping and starting times

Electronic Engineering Final Year Project

testing the motor
Testing the Motor
  • Initial test involved having no load
  • Select few motors were advanced to second test
  • Second test involved load of 5kg
  • Load tied onto coupling that was placed on motor
  • Results achieved determined the appropriate motor
  • Chosen Motor was the MFA COMO DRILLS 919D SERIES Single Ratio Gearbox

Electronic Engineering Final Year Project

motor test results
Motor Test Results

Electronic Engineering Final Year Project

finding the motor controller
Finding the Motor Controller
  • H-bridge was chosen for the task
  • Used to control the polarity of the motor
  • Used to turn the motor bi-directionally
  • Also used to “brake” the motor

Electronic Engineering Final Year Project

testing the motor controller
Testing the Motor Controller
  • The controller placed into the breadboard.
  • Voltage supply added
  • Motor attached to breadboard
  • Motor turned bi-directionally as well as “braking” when needed
  • Oscilloscope was used to observe wave patterns

Electronic Engineering Final Year Project

h bridge characteristics
H-bridge Characteristics
  • L293 used for this project
  • Two separate sides - Only one side needed
  • Pin1 – Switch Enable
  • Pin2 – High Pulse (Oscilloscope Channel 1 Connected)
  • Pin3 – High Output to Motor (Oscilloscope Channel 2 Connected)
  • Pin4 – Ground Also Connected to Pulse Ground
  • Pin5 – Ground
  • Pin6 – Low Output to Motor
  • Pin7 – Low Pulse
  • Pin8 – Voltage In (Connected to Pin16)

Electronic Engineering Final Year Project

motor controller results
Motor Controller Results

Shows the stepping changes on the H-bridge

Electronic Engineering Final Year Project

testing the microcontroller
Testing the Microcontroller
  • 8051 ADuC831 used for this project
  • A program is needed in order to test the 8051
  • Programmed in C
  • After weeks of testing, the program finally resulted in direct communication between the computer and the 8051

Electronic Engineering Final Year Project

microcontroller results
Microcontroller Results
  • Direct communication between the computer and the 8051
  • LED flashing indicates this
  • Hyper-terminal reads in the character ‘1’ from the 8051 (seen in next slide)

Electronic Engineering Final Year Project

microcontroller results1
Microcontroller Results

Electronic Engineering Final Year Project

addition to microcontroller results
Addition to Microcontroller Results
  • Addition to the program has been achieved
  • This addition involves the motion of the motor through the H-bridge
  • The motor can be controlled to turn clockwise as well as anti-clockwise
  • The motor can also be stopped or “braked” by the H-bridge

Electronic Engineering Final Year Project

next steps
Next Steps
  • Next steps are based around the infra red user device
  • This involves the building of the infra-red receiver
  • After that, the project will lead on to getting the second motor
  • This second motor will control the upwards/downwards motion of the table
  • Once this motor is coded, the physical designing of the table will follow

Electronic Engineering Final Year Project

questions
Questions?

Electronic Engineering Final Year Project