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Beckie jannet asked Which of these should I choose and how could I make the curcuit to power it?
A. Design and make a revolving jewellery tree. The unit must include an integrated lighting system that switches on automatically in darkness. B. Design and make an electro-mechanical paper towel dispenser. The unit must allow for the convenient refilling of the dispenser . C. Design and make a model of a lightweight structure/enclosure that could be used to host an event at the 2012 Olympic Games. Your solution must incorporate an automatic lighting system to enhance the appearance of the structure at night. D. Design and make a novelty toothbrush holder for the bathroom. The holder must incorporate a timer with a suitable output which indicates to a child that s/he has brushed his/her teeth for a sufficient period of time. E. Design and make a working model of an electro-mechanical golf trolley. Your solution must incorporate a means of controlling the speed of the trolley. F. Show jumping is a very popular sport in Ireland and throughout the world. Design and make a working model of a fence for a show jumping event, where the height of the fence can be adjusted electro-mechanically (limit/proximity switches should be incorporated as part of the control system).
And got the following answer:
D: is very easy just a holder with a few lights. A 555 timer to time out the brush time. a wall wart would power it. One button switch to start the timer.