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Squat from the LCD in Stampworks #11 — Parallax Forums

Squat from the LCD in Stampworks #11

BullwinkleBullwinkle Posts: 101
edited 2006-02-02 22:51 in BASIC Stamp
Checked and recheck the wiring:

P1->E
P2->RW
P3->RS
P4->DB4 (right)
P5->DB5 (right)
P6->DB6 (right)
P7->DB7 (right)

Loaded SW20-EX11-LCD_Demo.BS2, compiled and uploaded into STAMP. No changes!

I get nothing on the LCD!?

I have made double sure the DB4..DB7 connectors are plugged in on the right side as the Stampworks manual shows ( pg 76 ).

Is my LCD dead? How can I test it?

Steve

I have uploaded the program ( now called lcd.bs2 but unedited from the original )
bs2
bs2
lcd.bs2
5K

Comments

  • ForrestForrest Posts: 1,341
    edited 2006-02-02 11:33
    Do you have a 10K potentiometer connected to Vo (Contrast control)? See the hookup diagram here for more info www.parallax.com/detail.asp?product_id=603-00006

    Post Edited (Forrest) : 2/2/2006 11:36:40 AM GMT
  • Charlie JohnsonCharlie Johnson Posts: 147
    edited 2006-02-02 15:23
    Also if you are using the PDB, make sure the pre-wired contrast control is not turned all the way down -- this has the same result as the post above.

    Charlie
  • Jon WilliamsJon Williams Posts: 6,491
    edited 2006-02-02 17:23
    Where did you get the LCD? Some have negative contrast bias and won't work with that board. The parallel LCDs in our catalog work just fine.

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    Jon Williams
    Applications Engineer, Parallax
  • BullwinkleBullwinkle Posts: 101
    edited 2006-02-02 21:37
    Charlie,

    That was it - thanks! I had noticed that pot before and wondered what it was for.

    Now I know!

    Woo Hoo ... Now to get it working with my clock.

    Steve
  • Jon WilliamsJon Williams Posts: 6,491
    edited 2006-02-02 21:39
    Oh, you mean that pot next to LCD header labeled "Contrast"? ·smilewinkgrin.gif

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Jon Williams
    Applications Engineer, Parallax
  • BullwinkleBullwinkle Posts: 101
    edited 2006-02-02 22:51
    Thank you Jon... tongue.gif
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