Hello @YO3HJV glad to hear you figured it out. I was just setting up a test to see if I get this 400 mA power loop too with my M5Core2; but I do not. When I set input mode I see about 82 mA drawn from the battery. When I set output mode I see about 99 mA drawn from the battery. (Note: an LED is connected to the Grove port.) In case your still interested in my UIFlow2 test program. It's in UIFlow2 Project Zone called: M5Core2_Input_Output_Test_UIFlow2.4.6 Thanks Felix