| Input System Evaluation: |
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| The system uses a microphone and interprets the signal to a digital form allowing it to be easily used in a later process. The Schmitt Trigger successfully converts the analogue signal to a digital signal. The monostable extends the pulse so it can then be interpreted by a process. The final design fitted the specification fully and worked fully.
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| Process System Evaluation: |
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| The process successfully interprets the input signal using a counter, which controls a pic programmed with different light sequences. The counter counts the number of claps and therefore depending on the number, controls the light sequence. The pic successfully controls different light sequences however the number of inputs reduces the amount of light sequences. A larger pic would allow more inputs. Unfortunately the limitation of the number of lines in programming, due to the software, still limits the number of light sequences. The design fits the specification and works fully.
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| Output System Evaluation: |
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| The LED�s provided a suitable and effective display whilst being discrete. The ultra bright LED�s proved to be worth while, as they produced a brighter result. Using suitable resistors the LED�s were successfully incorporated into the circuit. They are suitable for the fibre optics as when positioned under the tree�s fibre optics it created a brilliant result.
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| Overall Evaluation: |
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| The fibre optic Christmas tree was successfully controlled by clapping therefore changing the light sequences. Using a Schmitt trigger the signal from the microphone was converted from an analogue signal to a digital signal. The monostable extended the pulse, which was registered by a counter. The Pic interpreted the counter therefore changed the light sequence. The LED�s produced a brilliant visual effect through the fibre optics lighting the tree. The circuit works successfully fulfilling the full specification. To further develop the project the number of light sequences could be increased and the reset on the counter made to work. If the pic was larger more inputs would be available for more light sequences however the software would also need to able to program more lines on the pic. When taking an output from the counter to the reset there was not enough voltage to reset therefore through the use of an op-amp or logic gates the problem could have been solved.
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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 |
