Raspberry Pi: Voltage Converters and IO-Pins

Question

I want to drive an LCD that needs 6V-power 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 if 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?

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 09 '12 at 09:12
@Vorac please don't make absurdly trivial single-character edits to truly ancient, problematic questions. — Chris Stratton, Sep 29 '20 at 03:08
I’m voting to close this question because it has been abandoned with critical detail missing for **eight years**. — Chris Stratton, Sep 29 '20 at 03:09

score 3 · Answer 1 · edited Apr 13 '17 at 12:32

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:

Raspberry Pi: Voltage Converters and IO-Pins

1 Answers1