Hi i have a 3.3V Serial Enabled LCD 2x16 but what is “starbge” is that the screw connector on the serial backpack say 5Volt so i ca’t understand is this LCD for 3.3 (like site and spec and the label on display board says) or for 5V like the marker on the backpack?
Ciao
The serial backpack was originally made for 5v LCD displays. However, the backpack has a 16LF688 processor and it can run at 3v. If you have a 3v LCD display, it will work just fine. Just be VERY sure not to connect the board directly to a RS-232 port as a true RS-232 port will present voltages out of the spec of the board.
Hi Ralph i made a try powering my LCD with 3.3 (from FTDI) but don’t work, i mean the backlight goes on but i can’t see the “sparkfun” splash screen… power at 5V work good so what now?
LCD modules powered from 3.3 V usually require a negative contrast supply. At 5 V they usually work with a positive contrast supply, or one at 0 V.
Leon
Hi Leon thanks i adjust the contrast and now the slpash appear this means that the PIC on the serLCD board are woring properly but… the LCD print a lot of random pixel and not what i send to it, i’m using this lib http://www.arduino.cc/playground/Learni … kFunSerLCD and ad 5V work perfectly. i also try to lower the serial communication (recompiling th lib) speed till 1200 bps but nothing change.
sorry i’m using this lib http://www.arduino.cc/playground/Code/SfLCD
ok an update, i solved partially the problem upgrading my arduino sw to version 16 infact i discovered that the alien characters depends on the softserial lib that don’t work properly on my arduino mini 3.3 8Mhz (was not supported only 16Mhz was)
Now i have another problem but not depending on the voltage so maybe is better to open a new topic.
Ciao