For electronical circuits such as this, for example:
those make on these boards:
what should i add to this scheme and i can track the percentage charge of battery?
Thanks.
It appears you are trying to create a battery fuel gauge. Your circuit does not make appear valid, part of it is missing. You need to spend some time looking up what you want to build and what is involved. You need to know some simple things like the current battery capacity (this changes with time and temperature), temperature, energy consumed from the last charge, what was the last charge level ETC. This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!
Gil
And is it possible to monitor the capacity of that kind of battery, and I will take care of everything else myself.
Aleksandari:
And is it possible to monitor the capacity of that kind of battery, and I will take care of everything else myself.
Yes, but:
-most monitor circuits draw power, so they will drain the battery if left permanently connected
-you need the manufacturer or other spec to correlate voltage w/ available charge.
-the charge is best measured under load, see the first point.
-you need the manufacturer or other spec to correlate voltage w/ available charge.
???
Some battery chemistries have a flat discharge curve so you need a coloumb-counter to track charge state.
Check out the various datasheets for cells and you'll see how much variation there is between say LiPo, NiMH, lead-acid and alkaline.
Even with chemistries with well-behaved charge/voltage slopes you need to correct for the current load current
and internal resistance. And temperature will make a difference to nearly all battery parameters too...
Its not an easy problem, there is definitely not one simple solution for all battery types.
My electronical circuit has nothing to do with gasoline, it is an electrican voltage measuring device.
So in my opinion there shouldn't be any large variations in temperature, probably around room temperature.
What those monitor might be called? What exactly to look for i think is it a broad term?
The point people are trying to make is that you can certainly measure the VOLTAGE of the battery but that will not tell you how much charge is left in it.
For some types of battery voltage might give you a reasonable estimate but for others it tells you nothing. For example a NiMH cell will be full if it is over 1.2V but from about 80% to 20% it will be between 1.0V and 0.9V then it will suddenly drop.
Steve
Is it in any way possible to calculate the battery consumption so that if you add some kind of LED diod, which will turn off when the percentage of the battery drops to 2%, and that we know it is time for a changing the battery before drops to 0%?
Maybe without a monitor, as soon as the special LED goes off, we know it's time to change the battery.