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I want to drive an LCD that needs 6V from a RaspberryPi. The Pi has a 3.3V logic power-pin, and a 5V power-pin that's directly connected to the MicroUSB-PowerSupply.

  • Am i right in the assumption that all MicroUSB-Supplies are regulated, so the PI expects / delivers regulated 5V-voltage on this pin?

  • What happens i connect a voltage-converter (Step-Up?) to this 5V line and connect this circuit to the GPIO-InputPins? Is that even possible? Does the circuit then have 5V or the voltage that the converters delivers?

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Connecting 6V to the GPIO is likely to overheat and damage your device. You need a "level shifter", which depending on frequency could be as simple as one transistor per line in "open collector" configuration. – pjc50 Jul 9 '12 at 9:12
6 V for power, I assume? Not for I/O, right? – Brian Carlton Jul 30 '12 at 23:08
Correct. 6V for Power. – Fabian Zeindl Jul 31 '12 at 7:09
Why is 'Arduino' in the title for this question? – ThomasW Mar 27 at 0:50

1 Answer

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As pointed out before, build a 6V power supply and connect transistors (possible FETs) to the GPIO pins to drive the display. If you have trouble, check:

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