Calculator´s LCD

Hi firends,

I´m trying to drive an 8-digit LCD (calculator´s like) with a PIC 16F877

I know it iso not very easy, but I must use a display like that.

Have someone ever tried to do that ?

Some tip on how to start doing that ?

Thank you !

Sérgio

do you have any part# for your LCD or datasheet. That will be helpful in case you really need help by someone here ;)

Hi Steve,

you´re right about the Part#

The problem is : I have a big box full of those 8 digits calculator´s LCD (aprox 2000 units) with no Id´s, but I know they were origanlly designed for calculators.

I did some comparisons with some other chinese calculators and the display pinout are practically the same, with some no relevant changes (pin spacing etc)

What I would like to know is the main idea on how to drive a regular LCD with no embeded controller and if it is possible to be done with PicBasic.

Thanks

Sérgio

Regular LCD must have a regular frequency running on the backplane pin. HPWM can be used for that. Once you have a frequency on this pin, just try to find the according pinout.

Basically it's not really different than to drive regular multiplexed 7 segment display

and yes you can handle it under PBP, but it's maybe easier to use LCD driver IC for that depending on your programming skills.

Hi Sergio,
Thave a look at the PIC16F913/4/6/7 series of PIC http://ww1.microchip.com/downloads/e...Doc/41250C.pdf
These have LCD drivers built in and are supported by PBP. They will connect directly to your 7 segment calculator LCD.
HTH,
Robert G8RPI.

Hi Steve and Robert,

thank you for your tips.

I would check the pic 16F913.

It seems to be a good option.

Thanks

bye

Sérgio

correct me if i am wrong. a 14 OR 16 PIN LCD WILL WORK WITH THE PicBasic Pro compiler's LCDOUT command. do a search on LCDOUT and connection diargram are around. search this place as well as google. the lcds must have a built in driver, they are really small so you might just see a black blob or tape on the lcd unit. if it meets these requirements then it will be VERY easy to program with minimal wiring, well 10 or so.

EDWARD,

Sergio is talking about "Dumb" LCDs with no embedded logic at all!