I agree. Full disclosure; I'm a programmer, not an electronics guy, so setting a threshold by typing in a number comes much more naturally to me than "tweaking the Vdd supply rail" . But the approach has SOME merit, I think. The microcontroller can do other useful things like driving a fuel gauge. Delays and on/off thresholds can be set programatically. Potentially it can reset the Pi via the P6 pins if needed(?). All of which could be done electronically, I'm sure, but I wouldn't have a clue.redhawk wrote:Using a ATiny85 chip seems a bit excessive for monitoring the supply voltage but then again why not I suppose.
lupa wrote:Well, to be honest, in my project I don't need a big accuracy... as long as the Pi can be shut down COMPLETELY at a certain point in time I should be fine.
The scenario would be: normally combination of batteries and solar light will power the Raspberry. In case there is bad weather for many days maybe the batteries will not be enough and they will give a lower tension (scaling down ideally to zero?).
At a certain point the Pi will be not powered but ... once the solar Power is enough to start it again it will go up....
Very theorical of course
lupa wrote:Something similar to this?
Controlled shutdown duration test of Pi model A with 2 cell lipo
http://raspi.tv/2013/controlled-shutdow ... -cell-lipo
It seems not too complex....
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