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8x8 Two-color LED Matrix

With an ATmega328P

8x8 Two-color LED Matrix
This article describes an alternative method for driving a matrix consisting of a large number of LEDs, while using only a few I/O lines from a microcontroller. As an example application for this circuit, a small game was developed in which an LED can be directed across the matrix using a joystick.An LED matrix is a good starting point to gain experience in the details of driving LEDs, in this case, using Charieplexing.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
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Main Board
R1,R5 = 390Ohm
R2,R3,R4,R6 = 10kOhm
R7 = 1kOhm
JOY1 = 2-axis joystick 2x10kOhm w. pushbutton (e.g. Conrad Electronics # 425637-89, matiching button # 710047-89)
C1–C11 = 100nF, 5mm pitch
D1 = 1N4004
LED1 = LED, red, 5 mm
T1 = BC547
IC1 = ATmega328P-PU, programmed, Elektor # 130146-41
IC2 = 7805
IC3,IC4,IC5 = 74HC595
IC6 = 74HCT04
9-V battery w. holder
PCB # 130146-1 [1]
Display Board
R1–R16 = 120Ohm
LD1–LD64 = dual LED green/red, IF = 10 mA (e.g. Conrad Electronics # 156269-89)
SV1,SV2,SV3 = 8-pin pinheader
PCB # 130146-2 [1]

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