I am using a battery to power my system and was wondering if there was a way to read the voltage from the barrel jack input so that I can integrate a state-of-charge monitor at a software level. It is possible to read this value directly or would I need to read the voltage externally and feed it back through the GPIO somehow?
you may see-also developer guide, Software-Based Power Consumption Modeling.
the input voltage is available via sysnode, there’re different channels.
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