First Post! (Guess I have to start somewhere!!)
I am halfway through my first Arduino project - and I must admit, I haven't had so much fun in years!!! I have a rudimentary knowledge of C++ (programmed with it 14 years ago) and zero knowledge of electronics (I used a soldering iron for the first time ever yesterday!!!)
I have successfully connected a 5110 lcd to my Arduino Nano following these guidelines: http://www.ebay.com/itm/131082227580?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 (scroll a bit down to see the connections)
Summary: The Vcc and BL of the LCD is connected to the 3.3V output pin of the Arduino.
My problem: I read that the Arduino pins are only capable of 40mA output and that the backlight of the 5110 needs more than that. So in time I will burn out the pin. I agree with this statement in part because the Arduino Nano specs state that I/O pins are max 40mA. However, my question is this: Does the 40mA apply to the 3.3V pin as well or only I/O pins like D1-12 and A0-7?
Second question (and bear with me, I am completely new to this hobby): How exactly do I measure the amperage draw of the backlight?
Many thanks in advance! CX