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E-blocks Light Chaser Squared

Let’s complicate things!

E-blocks Light Chaser Squared
Sure, the E-Blocks LED Chaser from the February 2007 issue is a bit elementary. This month we’re going to try and expand it to a larger number of LEDs, but the simple light chaser principle doesn’t really lend itself to this.
If we wanted to drive 64 LEDs directly, we’d need 64 separate output lines. Having decided to stick with our 18-pin PIC16F88, we’re going to organize the LEDs into a matrix of 8 rows and 8 columns.
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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.

R1–R8 = 22?
D1–D64 = LED, diam. 3 or 5 mm
IC1 = 74HC138
J2B, J3B = 9-way sub-D plug, (male), PCB mount
J7B = 2-way terminal block, PCB mount
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