Serial LCD need 5volts, if you use a Arduino don’t need a external supply, because use this voltage from USB or 9volts battery but if you use a Seeeduino Stalker you will have problems with the voltage.
Serial LCD need 5volts, if you use a Arduino don’t need a external supply, because use this voltage from USB or 9volts battery but if you use a Seeeduino Stalker you will have problems with the voltage.