Rotating Message Display with LEDs and an AVR Micro

Text at the speed of light

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…

This is a MEMBER ONLY article. You need a subscription to read this article.

Benefits of a subscription

Unlimited access to online Member Only articles
3 new editions Elektor Magazine (digital)
More than 5000 Gerber files
20% member discount on e-books (at elektor.com)
10% member discount on Products (at elektor.com)

View the offers
Available from €5.33 per month.

What is Elektor Exclusive?

Materials

060014-PCB.pdf

060014-11.zip

Component list

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