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- The fibre optic Christmas tree must be controlled by clapping. The number of claps will change the pattern the fibre optic tree will flash.
- Using a microphone the claps will be detected therefore making it sound operated.
- The analogue signal from the microphone will be converted to a digital signal.
- The outputs must be bright enough to illuminate a standard tree with a large number of fibre optic cables so that it is visible in a light room.
- The Christmas tree has fibre optic cables spread throughout the tree, which are joined at the bottom of the tree. Using LED�s at the bottom of the tree it will light up the fibre optics, therefore lighting the tree in different patterns.
- The power supply needs to be small and portable therefore allowing the circuit to be integrated into smaller trees.
- The microphone specifies that the optimum voltage level is at 4.5 volts. This allows the power supply to be portable, i.e. 3 AA batteries. The components therefore have to make use of a low current.
- There needs to be a default light sequence pattern, so when the tree is switched on it will cycle through the same pattern until a clap changes this. The pattern must not be an extreme, i.e. fast or slow, but be a mixture so the default pattern provides an attractive variety.
- There must be at least four different light sequences.
- In each sequence the change of colour, changing to a different output, will be a straight change instead of a gradual change
- There must be at least five different colours.
- 3 AA batteries provide 4500 maH. Therefore 4.5 A * 3600s = 16200 C. Each output using an average of 20 mA. With 5 outputs they use 100 mA, which = 0.1C/s. Using I=Q/t 16200/0.1 = 162000s. Therefore the batteries should last 45 hours.
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| Contents |
Research |
System Designs | Design Specification |
Input Sub-System |
Process Sub-System |
Output Sub-System |
Final Circuit Design |
Evaluation |
The Project |
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