On 21/01/18 18:26, alister wrote:
> On Sun, 21 Jan 2018 14:33:13 +0000, 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.
>
> The GPIO ports on a pi are 3.3 V
> if you have driven them at 5V without protection you may have damaged the
> port & possibly other parts of the CPU (current limiting with a resistor
> may not be sufficient protection).
>
> this could easily result in erratic or unpredictable behaviour.
>
>
>
>

I used a web based calculator to calculate the resistor value and I'm
using a 220 ohm one

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