Raspberry Pi 3 supposedly requires a 5V 2.5A power supply. No matter where I plugged it in, there were low voltage warnings. I even tried connecting it to my tablet's 5.2V 3A socket, but sometimes there was still an error. When I used my USB tester on them it was always below 5 volts so they didn't output good current and voltage unless used on their own device. I have no mistakes. I checked the output voltage as expected and it still put out 5.1 volts. I currently power a Raspberry Pi 3B, an SKR 3D printer board (to keep the board in sleep mode and accept the power on command when it's not at 24 volts, a MOSFET to drive and dim the print head with an M355 command and a control relay power to turn the 120v power supply on and off the 24v power supply with commands M80 and M81 respectively.That's a bit overkill but does the job well.
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