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Gpio problem Rpi

Former Member

My raspberry pi 3v3 is not getting power (getting 1V when checked with multimeter) and other Gpio's are also not working properly i have checked with trouble shooting methods so power supply and polyfuse is proper what will be the problem anybody can help?

 

Thank you

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  • On AVR processors, if you configure a pin as "input", setting the "output" bit will enable a "weak pullup". This is normally so weak that you wouldn't see a led light up. (it can be seen when you try and with an efficient led, but it's much weaker than you'd expect from a led).

     

    It works a bit differently on the BCM2835, but still it sounds as if you're just playing with the "weak pullup" instead of the output bit.

     

    Do you have a multimeter? Put a 220 ohm resistor (*) in series with your multimeter in "current" mode. Measure the current out of the GPIO pin. about 15mA is what we expect, 12-18 would be "expected". If you get say 60 micro A, that would be a "weak pullup" in action....

     

    The raspberry pi GPIO pins are 3.3V, so lighting a 3.6V white led is not going to work. What color led do you have and what does your supplier claim as the forward voltage?

     

    (*) I see you have a  270 ohm resistor. That'd be fine too.

  • in reply to rew

    Pls understand that am telling about 3.3v Power pin am not getting power to that pin after a boot up but am getting 3.3v when didn't inserting memory card

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