I know, I know, another one, but I think everything is correctly set up. The contrast (used 10K pot as recommended) and backlight work. The RS and Enable pins are in the correctly connected to the Arduino as are the D4 thru D7 pins. The lcd used HD44780 parallel interface chipset as seen at Basic 16x2 Character LCD - Black on Green 5V - LCD-00255 - SparkFun Electronics.
The code is exactly what's on the arduino.cc website: All the tutorials I've seen were with previous versions of the Arduino. I'm using an Uno. Is there something different (extra code) that needs to be added? #include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("hello, world!");
}
void loop() {
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
lcd.setCursor(0, 1);
// print the number of seconds since reset:
lcd.print(millis()/1000);
}
Sorry wrong picture. I had already read that post and checked off all of the potential errors.
(Previous picture was of broken breakout units. Different issue.)
It's a bit hard to trace the wires from point a to point b. That's what we need to make sure you wired everything right.
From the screen, your both lines are off on the contrast. If you turn one of the pots (why are there two and how are they hooked up?), does the contrast change? You want to turn the pot so that you don't see the dark shade on the display.
Sorry about the fuzzy picture. I took it with my phone.
Pin 2 is soldered. It goes to 5v and there is power to the display.
When I turn the pot for the contrast, it definitely changes, going from a dark screen to seeing two rows of blocks.
The two pots are just for the heck of it. One was for the backlight, but I don't need it. I just used it to rule out that not having it wasn't the problem.
The contrast with the variable resistance goes from dark to light. Isn't that what is supposed to happen?
Could you be a little more specific? What do you see with the pot at one end? What do you see with the pot at the other end? Where did you wind up leaving the pot set? Can you measure the voltage between pin 3 and ground at that setting (and tell us what voltage you measured)?
