Searching \ for 'Multiple LCD displays' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/lcds.htm?key=lcd
Search entire site for: 'Multiple LCD displays'.

Truncated match.
PICList Thread
'Multiple LCD displays'
1999\10\26@153727 by John De Villiers

flavicon
face
Folks, i need info.

I have a circuit that i initially designed for a MAX7219 ( 2 of them )
display driver. I was using all 16 segments that the two chips could drive.
This sucks a lot of mA's, more than i can spare, so the obvious answer is to
use LCD displays.

Problem - i have 3 seperate displays ( one large 5 digit, one large 3 digit,
and one small 5 digit). With the MAX chips this all still only took up 3 I/O
lines. Are there any LCD display Kits/drivers that will allow me to cascade
3 seperate LCD displays.

Alternatively, i need suggestions on driving all these displays 9 like maybe
a separate PIC that handles just the displays and uses an I2C interface to
the main PIC. I've never used i2c before. Busy scanning the Mchip cd right
now for info on that.

John

1999\10\26@172656 by Andres Tarzia

flavicon
face
Using common alphanumeric LCDs (Hitachi 44780 controller or compatible), you
can attach as many as you want in a "bus" architecture.
- Use 4 lines for data I/O (DB0-DB3) tied to all LCDs
- Use 2 lines for control (RS and R/W)also tied to all LCDs
- Use 1 line for chip Enable (E), but this has to be a separate line for
each LCD
This is a total of 6 common lines plus one for each LCD.
Then you program the LCD in the usual way, but just enable one at a time.

Hope this helps.

Regards,
Andres Tarzia
Technology Consultant, SMART S.A.
e-mail: spam_OUTatarziaTakeThisOuTspamsmart.com.ar

{Original Message removed}

More... (looser matching)
- Last day of these posts
- In 1999 , 2000 only
- Today
- New search...