An Electronic Food Timer

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An Electronic Food Timer
A Process of Design
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An Electronic Egg Timer

• Situation
• A number of cooking operations are dependant upon
  
• some type of timing device to ensure that the
  food is
• prepared to the required standard.
• Design Brief
• Design a contemporary Egg Timer appropriate for
  a
• domestic environment
• Identification Analysis
• An electronic system is required incorporating a
  timing device
• Some type of interesting product/casing design to
  house the electronics system and battery?
• An output device light / audible tone?

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An Electronic Egg Timer

• Recognition of Constraints
• My design, communicating and manufacturing
• capability, knowledge and skills
• The type of manufacturing processes available
• Materials accessible
• Tools, machines and equipment
• Function and ease of use
• Hygiene ease of cleaning
• Location of PCB and battery

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An Electronic Egg Timer

• Investigation Research
• Design inspiration!! Where do I start?
• Observe and analysis existing timers
  mechanical, electrical - reverse engineering
• Research for ideas internet, magazines, books
  etc
• Reference to existing ideas or stimuli should
  demonstrate how these materials have influenced
  your thinking around the problem or stimulated
  the thought process / ideas?
• Designing using Mood Boards reference materials

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An Electronic Egg Timer

• Design Opportunities Designing for
  Manufacturing
• How will the parts fit together?
• How will the PCB be mounted?
• How will the battery be mounted securely and
  accessed?
• How will the potentiometer be located?
• How will the base be fitted?
• How will the time be registered?
• What type of output device will be required and
  where will it be located?
• How can we include detail into the design to
  enhance the aesthetics?

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An Electronic Egg Timer
Suggested transistor Timer Circuit No. 39 from
112 Working Circuits
Research circuit No. 40 for alternative output !
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An Electronic Egg Timer
Suggested 555 Timer Circuit No. 37 from 112
working circuits
Research circuit No. 38 for off for a period!
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An Electronic Egg Timer
Design a former from any one of the given block
shapes that is appropriate for the vacuum forming
process. The form should be suitable as a casing
design for an Egg Timer.
Designing for Manufacture
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An Electronic Egg Timer
Suggested Idea 1
Suggested Idea 1
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An Electronic Egg Timer
Former turned on the Wood Lathe
Vacuum formed using rigid polystyrene sheet
Suggested Idea 2
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An Electronic Egg Timer
Internal egg rack
Show sketches of your ideas for a base?
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An Electronic Egg Timer
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An Electronic Egg Timer
A semi-sphere may be used as a basic geometrical
shape for vacuum forming. This casing will house
the electronic PCB and battery. Design an
interesting feature that could be located to the
base to show the different time delays.
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An Electronic Egg Timer
Using graphics or model using CAD, to sketch
different ideas for a feature which would add to
the aesthetics - of this basic design
Pictorial view
Front view
Suggested Idea 3
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An Electronic Egg Timer
Contemporary kitchen timers
How will the PCB Battery be mounted?
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An Electronic Egg Timer
A
Inspiration!
B

• How will part (A) fit-into part (B)?
• How where will the potentiometer be fitted?

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An Electronic Egg Timer
Suggested Idea 4
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An Electronic Egg Timer
potentiometer
Fitting the potentiometer?
base
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An Electronic Egg Timer
Suggested Idea 4 developed
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An Electronic Egg Timer
Suggested Idea 5
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An Electronic Egg Timer
Suggested Idea 6
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An Electronic Egg Timer
Suggested Idea 6 fabricated in acrylic plastic
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An Electronic Egg Timer
Suggested Idea 6 fabricated in wood
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An Electronic Egg Timer
Suggested Idea 7 fabricated
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An Electronic Egg Timer
Acrylic sheet heated in the oven and press-moulded
Male and female former
Outcome after trimming
Press Moulding
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An Electronic Egg Timer
Finished assembled
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An Electronic Egg Timer
Suggested Idea 8 fabricated
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An Electronic Egg Timer
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An Electronic Egg Timer
PCB, printed circuit board
How will the pcb be mounted?