Electric wire suitable for soldering (thin, flexible, and resistant)ĭraw a 7x7 square grid (2.5 cm side) on the the plywood board.1 34 pin flat cable (to connect floppy disk to the PC).1 40 pin flat cable (to connect the IDE hard disk to the pc).To power the cube and the control circuit it is necessary a power supplier with the following specifications: The data are charged one by one through the input bits and the output bits are simultaneously collected from the 8 outlets. The registers used in this project are SIPO (serial input-parallel output) type. At each clock impulse, they allow the bit flowing from a cell to the next-one. The shift registers are composed by 1-bit memory cells connected one each other. The combination layers by column will select and switch a single led.
Overall, it will be necessary to control 8 cathodic contacts to select the layers and 64 anodic contacts to select the columns. In order to independently control each led, we divide the cube into horizontal layers and vertical columns.Īll the leds of a horizontal layer will have the cathodic contact (-) in common.Īll the leds of a vertical column will have the anodic contact (+) in common. To a human eye the cube will appear as completely lighted. To achieve that we simply have to switch on the different layers one by one at high speed. Let us suppose that we want to make the cube appear as completely switched on. So, what we do? We switch on a cube layer at each time! In this way the current consumption will never exceed 1.28 A (20 mA x 64 leds), which is easily supplied by a good voltage transformer. Actually, if we consider that the high brightness leds of this project require about 20 mA, we can calculate that 512 leds would require 10.24 A. We use the persistence of vision because simultaneously switching all the cube leds on would require a very high electric current (in ampere). If we can switch on and off the leds in a sufficiently quick time, (a few milliseconds) they will appear as if they were simultaneously on. All the animations are based on this biological dis-functioning of the human eye. This phenomenon is a feature of the human eye and is responsible for the illusion that a movie is not composed by individual still images. In this project we will exploit the persistence of vision. The whole structure will be based on a wood board.
The dimensions of the cube will be 8 led by 8 led, by 8 led, for a total of 512 leds.
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