Then i used the 3V3 pin on the Arduino to get the 3.3V, and then i connected everything as shown.
Then i programmed the Arduino using the example code, and when it was programmed nothing happend!
The LCD was only Purple and hummed very much (caused by the backlight StepUp converter)
I have tried to find the problem, but I can't!
If i disconnect the LCD and the I/O lines from the Arduino, and then connect to test the voltage deviders, the output is 3.25-3.27V when I apply 5V - so no problem there!
Have anyone worked with this board and display from Sparkfun?
Have anyone worked with the sample code from Arduino Playground?
Have anyone got it working (Board connected to Arduino as shown)?
the lcd draws around 324 milliamps at 3.3 volts. the 3.3v pin can only supply 50 milliamps, you might need some external voltage regulator to power it.
214 milliamps, 324 milliamps - now I'm confused!
I don't know how much it draws, but I'm using an external power supply, an LD33V for the 3.3V, and the 5V on the Arduino for the Backlight.
I've only had a quick read and it's hard to grasp from your words what you've done already so I may be wrong here; as you're now using two separate power supplies (the external 3V3 and the Arduino's 5V) in the same circuit have you connected both of their GND (0V) rails together?
I can post my HEX file here and you can upload it to your arduino to see if its code or set up. Please note that I used the Phillips driver code using this pin setup:
Nope, I didn't get it working!
I don't know if it's me who isn't connecting it properly (I've tried both the resistor and transistor method without luck), or if it's the display which isn't working
I haven't tried the 74LC chip method though!