THIS LIBRARY IS IN BETA, it might need work for reliable results
It can detect the status of your TP4054 chip (CHARGING, AC_POWER, UNDER_VOLTAGE_LOCK_OUT) if you connected it to your processor in the correct way. (get and set pins, see datasheet of TP4054)
It also supports a third pin connected to VBAT via a voltage devider to get a rough estimate of level of charge.
todo
MIT see LICENSE.md