Trimmer pot for LCD

Discussion in 'General Electronics Chat' started by Geoffr67, Jan 1, 2012.

  1. Geoffr67

    Thread Starter Member

    Dec 5, 2011
    69
    0
    Hello,
    I was wondering what you guys use for a trimmer pot for an adjustable Contrast on the 16x2 LCD useing the hitachi HD44780 chipset. I have been told a 50k should be used does this sound right? Also i have tried to search for cheap trimmer pots on digikey but cannot find anything that is not expensive, i want to keep the cost down to .15cents/per if possible. anyone have any recommendations?
    Thank you!
     
    Last edited: Jan 2, 2012
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    10k is a good size.
    Here:
    http://search.digikey.com/us/en/products/EVN-D8AA03B14/D4AA14-ND/11094
    You can get them for $0.10/ea, just buy 25,000 of them.

    Mouser has these for $0.18/ea if you buy 1:
    http://www.mouser.com/ProductDetail...=sGAEpiMZZMsl2q/phOiXBLJa8nbm6cqPseoMDFB32NI=

    Here's an E-bay auction; 50 for $6.59 w/free shipping - that's about $0.132/ea:
    http://www.ebay.com/itm/50x-Variabl...ultDomain_0&hash=item2c5d3a579f#ht_2928wt_951

    Here's 100 for $11.50:
    http://www.ebay.com/itm/100x-3296-W...ultDomain_0&hash=item19cc225584#ht_3500wt_904
     
  3. MrChips

    Moderator

    Oct 2, 2009
    12,452
    3,371
    I just use a fixed 1K resistor to GND and leave it at that.
     
  4. Geoffr67

    Thread Starter Member

    Dec 5, 2011
    69
    0
    Yes but i could use these for other things as well and would rather just have an adjustable contrast,incase. just for the heck of it. :)
    Thanks SGT for the links it really helped and those fit within the cost description :)
     
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