I am using 3 AA batteries of 1.5V each, to obtain a voltage of 4.5V which i am then reducing to 3.3V using a LDO. My current requirement is around 100mA.
I want a simple, low power dissipation circuit which would be connected to the arduino to monitor this battery level
Previously for one of my projects I have used a simple zener diode to monitor the battery level. However I didn't take into account the heat dissipation, reliability etc.
So, can I know what are the different types of options available? My main constraints are:- 1)Circuit should be simple 2)Low power dissipation
I am attaching the pics of my entire circuit and the zener circuit which i used before.]2
To provide a bit of background of the zener circuit, I first calibrate it for my application, then I am able to view the percentage of battery at the display.