Tackling Graceful Shutdowns on the GBZ

[Camble]

Well if the idea is to shutdown gracefully by button press but then not taking off the power then you do not even need a pololu any pushbutton to a gpio would do...
Ok then I add a switch to disconnect battery.. Ok basically not nice and practical but with a switch and a button no particular hw is needed but it's strange no ps2 exists for embedded that also features something like atx and apm for shutdown and battery level...

Yep, pretty much. This is why I'm working on something slightly different.

[tent]

Well if the idea is to shutdown gracefully by button press but then not taking off the power then you do not even need a pololu any pushbutton to a gpio would do...
Ok then I add a switch to disconnect battery.. Ok basically not nice and practical but with a switch and a button no particular hw is needed but it's strange no ps2 exists for embedded that also features something like atx and apm for shutdown and battery level...

Yep, pretty much. This is why I'm working on something slightly different.

Now I'm curious

[SidSilver]

You'll still be able to use a Pololu switch to perform a graceful shutdown. The problem of the supply being on exists with both the Banggood module, as there is no EN pin to shut it off manually. You could always add a switch between your battery and the power supply module though.

Well if the idea is to shutdown gracefully by button press but then not taking off the power then you do not even need a pololu any pushbutton to a gpio would do...
Ok then I add a switch to disconnect battery.. Ok basically not nice and practical but with a switch and a button no particular hw is needed but it's strange no ps2 exists for embedded that also features something like atx and apm for shutdown and battery level...

Don't forget the low battery shutdown...

[tent]

Don't forget the low battery shutdown...

Yes true I agree. As said in another thread the problems are two:

- fact1: raspberries with linux do not have a way to shut down like computer or laptop (a la ATX) by sending information to the PSU to shut down the power after OS was stopped first
- fact2: raspberries with linux do not have a way to sense if battery level is low when the device is portable (a la APM) by receiving a low bat singnal and undergo the shutdown of OS and PSU as above.

So far I was unable to spot something that was both CHEAP and SIMPLE or at least a close combination of it to address those issues.

[Oxodao]

What's the advantage of using a pololu thing there instead of a simple mosfet ?
My problem is that the Pololu is not available nowhere cheap from france...
And I do have quite a few mosfet that could correspond (IRF630 for example)

[tent]

I think it's just packaging two mosfets and pins in a nice package...

I found this one as well but lacks enablw/disable and even boost to 5v but the rest is incredibly well conceived: https://www.sparkfun.com/products/13777

[SidSilver]

Pololu cost 4€... affordable

[Oxodao]

Pololu cost 4€... affordable

Yeah no problem, this PCB is cheap enough... When you see that the shipping is at least twice the price that does not makes me want to buy it, do you have any cheap seller ?

[SidSilver]

Pololu cost 4€... affordable

Yeah no problem, this PCB is cheap enough... When you see that the shipping is at least twice the price that does not makes me want to buy it, do you have any cheap seller ?

Got mine from Gotronic (France).
I bought other things with the pololu to justify the shipping. The idea is to group orders as much as possible.

[Camble]

Pololu cost 4€... affordable

Yeah no problem, this PCB is cheap enough... When you see that the shipping is at least twice the price that does not makes me want to buy it, do you have any cheap seller ?

I might be selling mine. Where are you from?