Hein (fub) wrote,

  • Mood:

It is done

I now have a working 10x10 bright-blue LED matrix on my desk. I can't believe how hard it has been to get it to work! All I need to do now is to polish up the software, and then everything will be ready for Sunday!

Lessons I learned:
- Do not use transistors rated for 200mA to switch something that is very close to 200mA -- if you get one that is slightly at the lower end of the tolerances on the spec, it'll burn out.
- A multimeter is the most important tool you have. Measure connections with the resistance-meter, measure voltages during operation, etcetera. Invaluable information when debugging.
- Open drain outputs are really cool.

Tomorrow, I will post up some photos of the various designs I went through, to document some of my stupidity for prosperity.
Tags: electronics project

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