Hello, I am interested in building a WisBlock solution that is installed inside a vehicle, using the RAK19010 base with power slot, and RAK19016 5-24VDC power slot module. I will also incorporate an appropriate lithium rechargeable battery.
I want to connect the unit’s power input to the vehicle ignition switch, so that when the ignition is ON, this unit receives power, and when it is OFF, the unit runs only on its internal battery.
How can I tell, within my Arduino code, whether the unit is being powered by external ignition power, or by the lithium battery? Do I have to build a separate circuit to place across the 12VDC ignition power to supply the appropriate 3.3V input to one of the RAK4631 IO pins? or is there already a built-in way to sense between battery and DC power?
In November 2021 this was not possible. See this question. Hopefully something has changed since this time with the new base board, power slot modules, etc. If not, I respectfully request adding such a through-hole pad to the board in case of developers needing this feature.