DIY Arduino power/energy meter

Best & Fast Prototype ($2 for 10 PCBs):
Thanks to JLCPCB for supporting this video.
Months back we have build a current meter. Now, the last emter tutorial, we calculate power and print it on an OLED display. This project will measure current, voltage, power and energy. I've used a shunt resistor for the curent measure. More info below.
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Adafruit_GFX library:
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VIDEOS
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Current meter:
Capacitance meter:
Inductance meter:
Resistance meter:
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