maintain a switch position when arduin is off/sleep mode

Other Hardware General Electronics
2

HI,

Might it be as simple as putting a low leakage diode in series with the 5V to the LCD?

Keep in mind:

  • The display would only get ~ 4.5 volts
  • The leakage through the diode will drain the charge of the LCD so it might not stay dark when un powered as long as a mechanical switch.

I guess you could use a small relay.

Have you left the LCD "Valve" dark and un-powered for an extended period of time? I would think the charge would slowly dissipate but have no idea how long it would take (i.e. minutes, days etc).

Good luck.