I have a project where I am thinking of using a super-cap as the power source. The super-cap would be connected to a 5v step-up regulator which in turn will be connected to this push button power switch ( Pololu Pushbutton Power Switch LV (old version) ) When the power switch is activated my arduino will turn on and be able to turn itself off by sending a signal to the power switch. I was wondering what is the best way to make sure I don't overcharge the super-cap, using a solar panel to charge it.
I was wondering what is the best way to make sure I don't overcharge the super-cap, using a solar panel to charge it.
Either use a voltage regulator to make sure you don't over-voltage the capacitor.
Or, the practice with standard capacitors is use a cap with a higher voltage rating than you ever expect it to see. i.e. If your board runs off 12V, use capacitors rated at 16V or more.
Unless there's something I don't know about super caps (and I've never used one) you can't "over charge" a capacitor, but you can 'over-voltage it.
Lots of useful information in this post by Nick Gammon, describing a solar/supercap powered Arduino.