I power my 3.3V circuit with step-up power converter. Input to the converter should be from two Ni-MH 1.2V batteries or alternatively from two 1.5V alkaline batteries.
I need to indicate low battery (by eg. LED blinking) and when the voltage reaches critical level the circuit should be disconnected. Probably I'll need some LVD (Low Voltage Disconnect) solution. Ideally if I could adjust which voltage should be indicated as warning and which to trigger circuit disconnection.
In my project I am using Arduino Mini Pro (3.3v) so maybe I could use it to measure the input voltage of the converter and warn if it is low.
Could somebody please propose me which circuit to use as LVD to fit my needs? Or any other solution?