AVR-Chat

--- In AVR-Chat@yahoogroups.com, jay marante <jaythesis@y...> wrote:
> i have a 4x20 character LCD with 16 pinouts. ... It's pretty 
> obvious that pins15 and 16 are for the backlight. i don't know 
which is for the VCC and GND...

Pin 16 is most likely ground and pin 15 is typically a variable 
voltage to adjust the intensity of the backlight (0V darkest, 5V 
brightest).

Your circuit would probably work.  You could also feed pin 15 from 
the wiper of a pot to allow adjustment of the backlight when it's 
switched on by the transistor.