Power Supply

Important

The standard Raspberry USB power supplies have 5.1V and not 5.0V. https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#power-supply

Using a 5.0V might work but might print under-voltage warnings to the screen. Obvious long cables can cause the same effect due to the voltage drop. The raspberries schematics show however the 5V standard voltage.

vcgencmd get_throttled should show 0x00000

There are:

Table 9.2. 

Voltage Pins
5V 2, 4
3.3V 1, 17
Gnd 6, 9, 14, 20, 25, 30, 34, 39


The raspberry can also be powered through he 5V pin. The 3V3 is however just an output where not more than 50mA should be drawn.


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