What LCD does the Unicorn use?

Krumlink

New Member

• Jun 26, 2008

• #1

Today I received and assembled my unicorn LCD experimenter, and was wondering what LCD does it use and what controller, because when I plugged in my Hitatchi 44780 LCD it did not even power up. Thanks

 

futz

Active Member

• Jun 26, 2008

• #2

Krumlink said:

Today I received and assembled my unicorn LCD experimenter, and was wondering what LCD does it use and what controller, because when I plugged in my Hitatchi 44780 LCD it did not even power up. Thanks

Click to expand...

Almost any standard pinout 44780 will work. The pinout on the far right of **broken link removed** is standard. The only optional part would be the BL (backlight pins), and even they seem to be fairly standardized.

Make sure you have a jumper on J1.

 

Last edited: Jun 26, 2008

Krumlink

New Member

• Jun 26, 2008

• #3

Hmm I wonder why mine would not power up.

 

blueroomelectronics

Well-Known Member

• Jun 26, 2008

• #4

You also need to install the jumper J1 and adjust contrast. Remove J1 for GLCD displays.

 

Krumlink

New Member

• Jun 26, 2008

• #5

There we go! Contrast was twisted the wrong way. THe backlight is still not working though, but at least it powered up. Thanks. The backlight on this LCD is wanky anyways. Hey bill do you have any spare LCD's (blue backlight) I can buy off you?

 

blueroomelectronics

Well-Known Member

• Jun 26, 2008

• #6

The backlight is software controlled

 

futz

Active Member

• Jun 26, 2008

• #7

blueroomelectronics said:

The backlight is software controlled

Click to expand...

Set RB3 high to turn it on. Look on the schematic and you'll see there's a 2N2222 controlling the ground line.

 

Last edited: Jun 26, 2008

Krumlink

New Member

• Jun 26, 2008

• #8

Yeah just saw that.

 

Krumlink

New Member

• Jun 26, 2008

• #9

Just made a jumper that shorts out the transistor to have backlight on. I can still PWM if needed.