How to Interface 22v battery to nRF52832

[gain]

Hello ,

I saw some examples in nordic forum in that they measured coin cell battery voltage level

how to interface 22v battery to nrf52832?

 Thanks

learn

[awneil]

Clearly, 22V is way too high for the nRF52832 to measure directly!

There are many techniques for "stepping down" a high voltage to be measured by a low voltage device such as a microcontroller - none of them specific to the nRF.

Probably the simplest is to use a voltage divider aka "potential divider"

https://en.wikipedia.org/wiki/Voltage_divider

Again, this is a standard electronic design issue - not specific to nRF.

[gain]

Thanks it is use full

my question is how to generate interrupt when battery low and High

 Thanks

Learn

[awneil]

You didn't mention that at all in the question!

But, once you have stepped the voltage down to an acceptable level, it's no different to monitoring any other voltage.

The nRF52 just sees the voltage - it neither knows nor cares where it came from, or what it represents.

You can either use the comparator, or the ADC.

Depending on the type of battery, its terminal voltage may not give a good indication of its state of charge

[gain]

The type of battery is Lithium Ion battery you say so what procedure should be fallow to measure the state of charge on lithium ion battery

Thanks

learn 

[awneil]

Have you actually done any research yourself into this?

It has nothing to do with the nRF part, or BLE.

[gain]

I measured the battery level when it is full

When battery empty it should give battery empty on RTT terminal

every time should show on RTT terminal is that battery empty or full

when battery full interrupt should rise and when battery empty interrupt should rise

Ho to approach this problem

Thanks 

[awneil]

Again, have you actually spent any time researching the topic of how to determine the state of charge of a Li-ion battery?

gain said:

Ho to approach this problem

An internet search would be the obvious place to start; eg,