PM: 2.8" LCD board for the PM...

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Grogster Admin Group Joined: 31/12/2012 Location: New Zealand Posts: 8850	Posted: 03:47am 18 Sep 2022       Deleted your duplicate post. I normally use 5v also, but I have hooked up an LCD and 3v3 works fine for the backlight.  At least on the 2.8" SPI LCD anyway.  Perhaps NOT on the bigger 5" or 7" LCD's, but we're not using either of those. With a 27R series resistor, the LCD is quite bright - even on 3v3.