The completion of ‘The Hallucination Fan’ project was in fulfillment of credit for ELEC 499B at the University of Victoria.
The objective of
this project was to develop a novelty item for our own benefit in order to utilize
academic experience gained over the last 5 years.
‘The Hallucination Fan’ operation is based on the concept of persistence of vision. Affixed to a rotating circuit board are LEDs. These LEDs are illuminated in such a way that during board rotation, characters, which display the time as a digital clock, appear in air. The board moves faster than the eye can detect thereby giving the appearance that the time is floating.
The final design
implements a circuit board mounted on the motor shaft of a household fan, plugged
into a wall power supply. 8 LEDs
are affixed to the board in a straight line.
These LEDs are controlled by an Atmel AT90S2313 microcontroller.
The timing of the flickering of the LEDs is organized through external
interrupts from a Hall effect sensor and internal timing interrupts. On board power to the circuit is provided by a battery.
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