I couldn't find anything really useful quickly about picking resistor values and transistors to drive LEDs at the right current so I put together a blog post with a simple circuit and explanations of the various current and resistor calculations to help non-engineers. Arduino:figuring out transisto…

Single transistor LED switch

system February 10, 2010, 9:46am 3

I printed it out and stuck it on my wall.
Thankyou for the great explanation.

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