Article
E-blocks Light Chaser Squared
Let’s complicate things!
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.
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.
Materials
Gerber file
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PCB
Component list
Resistors
R1–R8 = 22?
Semiconductors
D1–D64 = LED, diam. 3 or 5 mm
IC1 = 74HC138
Miscellaneous
J2B, J3B = 9-way sub-D plug, (male), PCB mount
J7B = 2-way terminal block, PCB mount
R1–R8 = 22?
Semiconductors
D1–D64 = LED, diam. 3 or 5 mm
IC1 = 74HC138
Miscellaneous
J2B, J3B = 9-way sub-D plug, (male), PCB mount
J7B = 2-way terminal block, PCB mount
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