9942Re: [cosmacelf] Seven Segment Displays
- Apr 3, 2012On 4/2/2012 10:23 PM, Charles Richmond wrote:
> why can't an LCD 8 digit calculator display be used with the Membership Card.... or a modifiedLCDs are harder to drive than LEDs. You can drive an LED with anything,
> Membership Card.
but most LCDs need special display driver chips. Multiplexed LCDs (as
found in calculators and almost everything else) require an unusual
multi-level AC waveform.
The LCD displays themselves also tend to be customized. If you have the
money to pay for custom tooling, it can display almost anything you
want. But there aren't many generic LCDs suitable for one-off homebuilt
When I was designing the Membership Card, I did a few "test case"
designs using LCDs. There was very little interest in pursuing them, so
I gave up and went with LEDs instead.
It'd say your best bet for an LCD display is to buy a prebuilt module
that includes the driver chip, and write software to talk to it.
If you would not be forgotten
When your body's dead and rotten
Then write of great deeds worth the reading
Or do these great deeds, worth repeating.
-- Ben Franklin, from Poor Richard's Almanac
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart at earthlink.net
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