LCD display remains empty

[selbstdual]

First of all I want to make sure that the lcd is working at all. How do I do that?

[Kamikaze47]

first, make sure that when you apply power, the top line of the LCD displays solid blocks. If this is the case, try the additions i suggested above.

If this is not the case, you probably need to have a contrast control for the LCD. You need a variable resistor and hook it up like this:

LCD pin 3
   |
   |   +5v
   |    |
   |    |
   |    \
   |    /
   ---->\ variable resistor (10k or bigger)
        /
        \
        |
        |
       gnd

[bbazor]

I am not sure if this is your problem, but you might want to try changing "Define OSC 20" to all capitals "DEEFINE OSC 20". The compiler may not recognize lower case in DEFINE statements.

Ben

[selbstdual]

Can we come back to the topic whether the display works or not? Actually the blocks are black, when power is applied. But does that mean that symbols can be displayed? How to figure that out?

[Kamikaze47]

Can we come back to the topic whether the display works or not? Actually the blocks are black, when power is applied. But does that mean that symbols can be displayed? How to figure that out?

Did you read my last post?

When power is applied, does the entire screen show blocks, or just the top line? There is a big difference.