Ian Cull wrote:
{Quote hidden}>
> > I have a 4xsomthing alpha numeric display that I pulled out of an old card
> > swiper. My problem is identifying the inputs, it is not back lit so there
> > are
> > 14 unknowns in two 7 wire ribbons.
> >
> > Does anyone have experience or ideas about identifying the inputs without
> > causing damage to the display?.
> >
>
> If the LCD has fourteen connections it is almost certainly the "standard"
> wiring for an LCD module; ie:
> 1 ... 0V
> 2 ... 5V
> 3 ... contrast
> 4 ... RS
> 5 ... E
> 6 ... R/W
> 7-14 ... D0-D7
>
> Try supplying it with a current limited supply then connect the contrast to
> 0V; if it works you should see dim black squares in every character position,
> because it has not yet been initialised.
>
> Ian C.
This is not so uncommon to have a LCD with two lines
of 7 pins, thi is normally done in units that the pins
comes out in the side, instead of top or bottom.
The most common pinout for double row is:
edge
+--------------------------
|
| 14 13
| 12 11
| 10 9
| 8 7
| 6 5
| 4 3
| 2 1
|
+-----------------
Just to make sure, pin 1 (Ground) must lead to wider
tracks, also for pin 2 (Vcc).
Wagner
cornell.edu ICQ #: 3329174