Robots w/Lasers

March 29, 2006

Schematics

Here I am posting the schematic of the current design, and my proposed schematic for design revision 2. The main changes are:

  • Directly drive the ROW inputs with transistors, instead of using shift register. I have enough I/O pins that there is no need for a shift register here, and the transistors will allow a decent amount of current through.
  • Limit the current coming out of the COLUMNS with resistors. This is needed now that there will be more current flowing through. Before I got away without them, probably because each row was being driven by a single output pin of the shift registers
  • Use shift registers on columns as before, but this time with a latch, so you wont see the data being shifted in. Thus the ‘off’ LEDs will really be off, instead of the faint flicker/glow
Schematic Rev. 1
Schematic Rev. 1

(What I currently have built)
Schematic Rev. 2
Schematic Rev. 2

(What I am planning to change next time)
Filed under: AVR — davr @ 12:26 am

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