Rotating Message Display with LEDs and an AVR Micro

Text at the speed of light

Published in issue 361, January 2007

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