I got my new arduino uno and started to do some Projects.
I started with the blink led example and it works. So it seams the arduino is okay.
After that I tried the example liquid Crystal to control my HD44780 Display.
I know, that this Display works, because I used it already on my nerdkit.
I think I wired it correctly like on the tutorial on arduino.cc. LINK
But it won't Show anything on the Display. The arduino app says upload complete, but nothing happens. Only the orange LED is on. Any Ideas?
I am using a HD44780 with 18 Pins. But Pins 1 to 16 are completly the same like on other HD44780 Display. The addidtional 2 Pins are for additional Background colour.
One 10K Resistor for the contrast and one 33 Ohm Resistor for the backlight LED.
Did that work ok with your nerdkit? I have found that with the pot adjusted incorrectly, I can't see the faintest ghost of an image on the display, just the backlight.
The supply voltage may be a little different with the Arduino vs nerdkit, making the 10K not quite the right value. Have you tried a pot to see if adjusting that makes the display visible?
PaulRB:
The supply voltage may be a little different with the Arduino vs nerdkit, making the 10K not quite the right value. Have you tried a pot to see if adjusting that makes the display visible?
Thanks Paul, that was the solution. I thought the nerdkit also uses also 5V after the 7805. But maybe not accurate 5V. Thanks for your help.
Oh, and yes on my nerdkit it works exaclty like shown my breadboard. 10K Ohm for contrast.