LCD Segment driver
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Does anyone have any experiance driving a 7 segment LCD device directly like
the unit VL-322 (is like regular 7 segment LED). I have looked at some of the
BCD version out there but that ties up a lot of i/o(stamp2) for a 3 digit
display. Any info would be great.
the unit VL-322 (is like regular 7 segment LED). I have looked at some of the
BCD version out there but that ties up a lot of i/o(stamp2) for a 3 digit
display. Any info would be great.
Comments
>Does anyone have any experiance driving a 7 segment LCD device directly like
>the unit VL-322 (is like regular 7 segment LED). I have looked at some of
the
>BCD version out there but that ties up a lot of i/o(stamp2) for a 3 digit
>display. Any info would be great.
I haven't done this, but it has occurred to me that a nice 3 digit display
could be made with one of those cheap LED or LCD volt meters. These things
could be driven via PWM from the stamp to display any value.
Just an idea, Duncan
> From: electronguy@a...
>
> Does anyone have any experiance driving a 7 segment LCD device directly
like
> the unit VL-322 (is like regular 7 segment LED). I have looked at some of
the
> BCD version out there but that ties up a lot of i/o(stamp2) for a 3 digit
> display. Any info would be great.
You can drive a 3, 3.5 or 4 digit LCD display from a Microchip 40 pin
AY0438 LCD driver chip (available from Digikey). It only takes 3 stamp
pins.
The hard part is working out the interconnection between the 40 pin
driver chip with the 40 pin LCD display. See my
http://www.infiltec.com/inf-dm1s.htm
for an example of a device using this chip to drive a 3.5 digit LCD.
Hope this helps,
Dave Saum
Infiltec