Hello i have problems with a Serial LCD, my unit only works powered on the digital ports like, pinMode(10, OUTPUT); digitalWrite(10, HIGH); for 5V, and then gnd, rx & tx on pins 11-12.
If i connect vcc & gnd to the ‘power’ area near the analog ping it does not work, just the green led.
Any idea why? it doesn’t make sense, also it doesn’t work when powered with an independent 5v source.
This is a problem because digital pins only provide 40mA as maximum, the lcd works fine without backlight, but with the light enabled it doesn’t have enough power, since it uses 75mA.
So i can’t use the backlight…