[quote]Quote from FeersumEndjinn on November 29, 2011, 21:45
[quote]What I would like to know is:
\"How much current can the GPIO pins safely drain or source?\"
That is a question that I\'ve already posed and not yet received an answer to, so I\'d be interested in this as well. source current is critical, because even a few mA is enough to directly light an LCD, rather than using some form of bi-lateral switch to gain a higher source current.[/quote]
This has been discussed a few times in \'relay\' related threads such as re. the Gertboard.
I\'ve not seen an official spec, but Gert is pretty close. As I recall, the numbers mentioned were in the range of 2-8 mA drive. I don\'t recall seeing a sink number yet. I\'m hoping to see an official number that\'s better. If not I guess I\'ll be wiring up some simple transistor switches, or perhaps an octal driver or two.
I\'d really like to 1) solder in a header(s), 2) plug in a connector with 16 LEDs, 3) make them all blink.