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Type: Posts; User: smckinnon

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  1. Closed: Re: NodeMCU sinking current through DIO while power is off

    Thanks for your help.
    Brian, that makes more sense now. I guess I need a better understanding of how the uC hardware can switch between being an input and an output. I assumed there was some kind of...
  2. Closed: Re: How to calculate Signal Power using ADC samples?

    http://www.sjsu.edu/people/burford.furman/docs/me120/FFT_tutorial_NI.pdf

    NI has some good info: "According to the Nyquist criterion, the sampling frequency, Fs, must be at least twice the maximum...
  3. Closed: Re: NodeMCU sinking current through DIO while power is off

    Thanks, could you explain how switching the ground violates the maximum voltage and polarity ratings?
    Also, I had tried using a P Channel mosfet, but the issue I had was the supply voltage is 9...
  4. Closed: NodeMCU sinking current through DIO while power is off

    Hello, the issue I'm having with the circuit below is that the DIO pin is sourcing current while the push button is open. There are actually several push buttons that are arranged exactly as shown in...
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