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I have done the traditional Hello World with a blinking LED.
When it runs, it affects the power LED by dipping it.
I have the power LED after the 78L05 regulator with a 210ohm resistor.
Any ideas?
I have attached the schematic for the board.
I am not real good with documenting my work etc.
I just plugged the regulator circuit into LTSpice, I think I am starting to see what the problem might be. Without the LED, I get an output of 5.2v at ~120mA. When I add the LED, voltage drops to 4.7v at ~80mA.
The eye responds to peak brightness; by varying the LED duty cycle and using a big enough cap and a small enough series resistor you can probably fix this problem without dropping the perceived brightness.