Hello i am trying to connect an LCD i have found with arduino
it is driven by a LC7980 240x40 and ATMEL AT27c010 CMOS
and a LM324m
i traced the pinouts for it and here it is
1- LED A
2- LED K
3- MS - CONNECTED TO A RESISTOR TO RESET PIN ON THE LC7980
4- CS
5- connected to LM324M GND
6- RS
7- RW
8- RD(E)
9- DB0
10- DB1
11- DB2
12- DB3
13- DB4
14- DB5
15- DB6
16- DB7
17- connected to A13 pin on the atmel cmos
18- connected to A14 pin on the atmel cmos
19- connected to A15 pin on the atmel cmos
20- connected to A16 pin on the atmel cmos
i also found out the the MS pin on the LC7980 is connected to LM324m V+
datasheet for LC7980
i also found this library https://code.google.com/p/u8glib/
already have support for LC7981 which i think is very similar to what i have
if anyone could help me figure out how to connect it i will be grateful
Displays with the LC7981 controller require an extrernal contrast adjustment, which require -15V. You will not see anything without feeding this negative voltage into the contrast input of the display.