First post here as I regged not long ago. Great site and topics. Lots of intellectuals in the forum too.
I have been learning slowly on my arduino uno and ran into a rather simple yet confusing question.
I am using the HELLO WORLD script that the latest arduino program has under the examples section.
Everything works great.....My only concern is my hardware side of this.
My display is a 20x4 HD44780 - DE-LM005 LCD.
My data sheet says it requires a 10k-20k pot for supply voltage.http://www.datasheet4u.net/datasheet/D/E/-/DE-LM005_SureElectronics.pdf.html
I am using a single turn 10k horizontal pot, But oddly enough having the pot turned down all the way (0-50ohm) is the only time it has any effect on the blocks. Is it normal for the pot to be that useless on contrast. Taking pin 3 of the LCD to gnd seems to be just as effective as a pot turned right down. What am I missing ?
Also unable to figure out if my display needs a backlight resistor. Currently have a 10 ohm from pin 15 of the display to +5v
Any help is appreciated.