switched-controlled turntable
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Electronic Engineering Final Year Project
Switched-Controlled Turntable
Name: Dean McDonnell
Supervisor: Dr. Maeve Duffy
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Electronic Engineering Final Year Project
Objective of Project
1. To Design and Build a Switch-Controlled Turntable
2. Controlled through an infra-red remote control
3. Full 360 degree turn, bi-directionally
4. Stepped in 90 degree angles
5. Addition to project includes a second motor
6. Design Issues: Fit under assortment of beds and Portability
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Electronic Engineering Final Year Project
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”
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Building of Previous Design
Electronic Engineering Final Year Project
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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
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Operation of Previous Design
Electronic Engineering Final Year Project
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Electronic Engineering Final Year Project
Initial Step
Infra-Red ExecutionInfra-Red Execution Infra-Red Receiver Infra-Red Receiver
Microprocessor Microprocessor
Motor Drive Motor Drive
Motor Motor Table
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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
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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
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Motor Test Results
Electronic Engineering Final Year Project
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Finding the Motor Controller
Electronic Engineering Final Year Project
• 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
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Testing the Motor Controller
Electronic Engineering Final Year Project
• 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
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H-bridge Characteristics
Electronic Engineering Final Year Project
• 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)
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Motor Controller Results
Electronic Engineering Final Year Project
Shows the stepping changes on the H-bridge
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Testing the Microcontroller
Electronic Engineering Final Year Project
• 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
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Microcontroller Results
Electronic Engineering Final Year Project
• 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)
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Microcontroller Results
Electronic Engineering Final Year Project
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Addition to Microcontroller Results
Electronic Engineering Final Year Project
• 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
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Next Steps
Electronic Engineering Final Year Project
• 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
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Questions?
Electronic Engineering Final Year Project