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Design Brief

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Design Briefimage00.png

         Design a toothbrush holder, which will be used in a bathroom.

         Mr. Tooth, the toothbrush should be able to amuse children while

         they brush. A metronome timer must be used to time for three

         minutes and you should not be able to put back the toothbrush

         until then. The metronome timer will be shown in form of hands,image01.png

         clapping. There is also a clock on the mouth of the container to

         tell the time to the child and roughly how long more they have to

         brush for. Furthermore the eyes would light up when the

         toothbrush is taken out the container. The logo, Mr. T, should also

         be on the product. It should last in daily use for a year and

         children would want to use it. A full explanation of the electronics

         must also be given. There must also be a full guideline of the

         parts used and the amount of money paid for each item.


Problem Outline

                                                                                                         I aim to construct a child-appealing toothbrush

                                                                                                         in the hope that children in the future brush for the

                                                                                                         right amount of time. The timer in the toothbrush              

                                                                                                         holder times for three minutes and so children cannot

...read more.


image03.png        have a chattering teeth timer.Light

MainsEnergy source

Vacuum formed plastic


Clock on lips

Wood        Metronome

BoxToothbrush holder    



SoundChattering teeth


Task Analysis:

To make the timer for my toothbrush holder I will need to look at

how to make timers. The components I will be using are shown in the brainstorm. I want to look at:

image05.png        What do they do?

image05.png        What are they made of?

image05.png        How big are they?

image05.png        Do they have any common features?

Three things that I will look at when I do this are:

   Input                              Process                                      Output  

  E.g. timer                      e.g. a relay                                  e.g. sound                


  • The product should cost under £8 to build for each unit. 1000 units will be made.
  • The product must be waterproof.
  • The product must weigh less than 3kg. The smaller and lighter, the less the cost.
  • The timer will need to be accurate within 3 minutes.
  • The time-up warning will need to be in the form of a loud buzzer. The warning should go on for 30 seconds.
  • The electronics will need to be hidden inside a robust casing.
  • The power source must last up to 30 hours.
  • The casing and logo should be shown appealing to children so they want to use it. Bright colours should be used.
  • The power supply should be renewable.
  • It should be 100mm deep.
  • It should be user friendly; users should be able to understand how to use it easily.
  • The case should be safe to use. There must be no sharp edges or anything that may harm the children.
...read more.


compensate for momentary system load fluctuations. Such battery

modules could be installed close to sites of variable demand. They

cause few environmental problems and occupy little


Vacuum Forming:

Most electronic products have plastic casings. These can be made by

Vacuum forming high-density polystyrene sheet. The advantages of

Vacuum forming are:

image03.png        a rigid shape that requires no fabrication.

image03.png        a repeatable shape

image03.png        a variety of details can be added on.

image03.png        complicated rounded shapes can be achieved by adding details.

By using vacuum forming, I can easily shape my containers. The only

problem with this is that stretching of plastic sheet can thin corners,

meaning it is less safe.


A modern NiCad cell is made with both plates being made of steel. The two plates are seperated

By a thin layer of porous plastic. This separator is soaked in potassium hydroxide solution. All

NiCads are fitted with a seal, which acts as a safety valve to release gas generated in the cell.

The amount of cadmium used is very small so the cell is not as unfriendly to the environment as

We believe. This is why I want to use them. NiCads thrive on heavy use. This is also good for me

because the toothbrush holder will be used often. They would be able to last longer than batteries.

...read more.

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