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21

Thanks, both.

This has made this a whole lot more complicated than I thought.

Good and bad. Good it isn’t simply using a GPIO pin to turn the fan on/off… or what ever.

But bad in some ways in that it has included a new level of stuff I will need to do to get it working.

Now: pin 4…

it looks like it uses pin 4 for shutdown:

Which is pin 4… GPIO pin 4, or the pin numbered 4 on the pins. Because to me pin 4 is +5v. You can’t really send a signal into that pin.

It would be SO MUCH NICER if every one used the 1 - 40 of the pins and forget the GPIO number/s. I got stuck with this for a long time for no real reasons. (Sorry, ranting)

So I still don’t know which pin is used. As I said: I resolve pin 4 as +5v as it wasn’t declared to be the GPIO pin. Sorry just I got a new one ripped by someone in another forum when I got GPIO numbers and PIN numbers confused.

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22

Hi Andrew,

Sorry for the unclear wording. Pinout.xyz is good for this kind of thing:

Keep in mind that the BCM chip isn’t designed by the Pi foundation, only in collaboration with them, so they can’t orient things around the 40-pin header. And typically, strong ARM chips like the BCM2711 have hundreds of pins on the bottom, with only some going to GPIO

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23

And so it uses GPIO4 (by my take on how things are named) and not simply PIN4.

Again, not your fault. But it is confusing.

Had you said: “it uses PIN 7”, then when I look on my RasPi pin cheat sheet, I can see where it is.

Anyway, I have to get back to writing code. I have found a big problem with stuff I wrote and now need to fix it. :frowning:

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