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What is the voltage level of GPIO pins?

Vivid Unit’s 40-pin GPIO header has compatible layout with Raspberry Pi. All I/O pins are in 3.3V level.

Although RK3399 provides GPIOs in 3.0V, Vivid Unit adds level shifters to all I/O pins to make them 3.3V. This also brings a layer of protection on the I/O pins.