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The Pi's input voltage is set at a fixed 5V. stems from the USB peripherals. The Pi's SoC itself uses 3V3 via the voltage regulator.

Ghanima
– Ghanima ♦

2016-05-02 10:45:33 +00:00
Commented May 2, 2016 at 10:45
1

@Ghanima ... and the requirements of HDMI. Neither of which apply to an Arduino. The Pi's SOC uses 3V3, 2V5, and 1V8.

joan
– joan

2016-05-02 10:53:48 +00:00
Commented May 2, 2016 at 10:53
1

You're right. Though the lower voltages are generated on-chip.

Ghanima
– Ghanima ♦

2016-05-02 12:06:29 +00:00
Commented May 2, 2016 at 12:06

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