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Is there a way to tell if an Arduino MKR GSM 1400 has lost power and has to rely on the connected battery?

Ideally, I'd like to do this without adding additional circuitry. Alternatively, can I connect VIn to an analogue input pin?

On the schematic, there are two lines that seem promising. One named VBATT\2.4B that go into PB09 of U1 via a voltage divider and another named VBAT\1.4B. Also the BQ24195L is an I2C device which would probably be connected the the main micro controller.

What I need to do is to send an SMS as soon as the incoming power is lost to notify a user that the power supply has tripped. Does anyone have any code samples?

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VBATT/2.4B is used for measuring the batter voltage using the internal ADC of the MCU. It can't really tell if the battery is being used or not - except by maybe monitoring it over time and see if the voltage goes up or down.

However the BQ24195 is where all your hope lies. It has a status register that can tell you all sorts of things.

For example it can tell you if there is incoming power, and what that incoming power is coming from (a USB host, a USB power adaptor, or operating in OTG mode). It can also tell you what the battery is doing - if it's charging, or not for example.

A quick google search throws up this library specifically for the purpose.

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