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Rotating Message Display with LEDs and an AVR Micro

Text at the speed of light

Rotating Message Display with LEDs and an AVR Micro
This ingenious creation uses just eight blue LEDs to produce a scrolling text display with 360-degree all-round visibility. A more economical way of building a giant display device would be hard to imagine…
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Products
Components
K1 = connector for supply voltage 7-2V
K2 = connector for programming
K3 = connector for Hall-effect switch
K4 = common + (positive) connection for LEDs
K5-12 = LED connections
D1 = 1N4007
C1 = 47 µF
C2, C3 = 100 nF
C4, C5 = 27 pF
X1 = 16 MHz quarz crystal
IC1 = AT Mega 8, programmed
IC2 = 7805 Spannungsregler
R1-R8 = 330 Ohm
R9-R6 = 56 Ohm (value dependent on LEDs used)
T1-T8 = BC548
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