In article , RobH   wrote:
>I have been trying to get a simple led project to work on my pi 3 using
>a 5 volt 6 amp power supply and a 510 ohm resistor in front of the led
>to reduce the current going to it. Now after trying different tutorials,
>my pi 3 goes off on it's own from being powered up.
>
>If I remove the power lead and restart the pi 3 the red comes on and the
>green led flashes as well as the ethernet port flashing green led.
>
>I ssh into the pi 3 to try and run a python program, but then the pi
>dies, and there are no lit up leds anywhere at all on it.
>
>Is there any way it can be fixed or should I just forget about it.

Remove all LEDs, buttons, etc.

Boot the Pi, login, run a few programs - just to make sure the Pi
itself is running OK.

Halt and power down.

Connect from GPIO pin 11 (physical pin 11) to the LED to a resistor then
to 0v.

Boot Pi & login:

Run this command in a terminal

  gpio -1 mode 11 out
  gpio -1 toggle 11

Run the last command a few times. LED ought to go on/off.

Your 510 ohm resistor ought to be fine - as a general guide
for most generic red/yellow/green LEDs you can use a value of
Voltage * 100 ohms, so for the 3.3v Pi, then 330 ohms is fine.

More pictures here which might help you get started:

  https://projects.drogon.net/raspberry-pi/gpio-examples/blink/

Gordon

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