Hi everyone,
I have a nrf51822 Bluetooth chip that control a stepper motor, this Bluetooth chip can be powered by a maximum voltage of 3.6V, but I need a higher voltage for my stepper motor (the driver of the motor works at least with 4.5V), and as I need some autonomy and some power I use 2 Li ion batteries in series, to power my nrf51822, I use a LDO to have the good voltage and not destroy it, the thing is I would like that my nrf51822 get the battery level to know if I have to recharge the batteries or not.
Does anyone know how I can do that?
i have look for it but have absolutely no idea of how to get the battery level if I measure it at the output of the LDO, and I can't directly plug the batteries to the BLE device or it will burn obviously.

Thanks for your help, and any idea!

 

Try looking at the datasheet , has a 10bit Adc, so it should be possible..


https://www.google.com/url?sa=t&sou...FjAAegQIBhAB&usg=AOvVaw0paPFeKoJPJR-AEM72YNww

 

Or,
----> https://www.aliexpress.com/item/Lit...20-40f3-9d9d-db2bc55b55bb&transAbTest=ae803_4

 

Or a resistor divider.