Serious help needed, why all low (below 5v) voltage battery chargers/boards does only half the job, they just cut off power but not back on!?
Goal is: power the supply unit to charge 1 cell LIPO battery: with power cut OFF when battery charge reaches 4.1v and turns charge ON only when battery reaches 3.6v (adjustable V is disarable option) in other words i need battery costantly powered, but charge only when battery is drained to about 20% and stop charging when battery charged to about 90% capacity
I think i found solution how to go around it, but no board witch could do that so i need help building one.
My thought was put clamp voltmeter on battery leads to detect lowest 3v volts, then voltmeter send signal to relay witch powers ON entire charging circuit to recharge battery and switches relay OFF when voltmeter detects 4.2v Only problem i am just amature understand just basic paramaters
arduino probably could do the work but i have no clue what components to buy to make it happen.
Thanks for advice or links