parallel lcd question

Manuel

Hey, now that i made my now parallel lcd work and i have never worked with one before, i would like to ask:
Must I use the·Data command to store what I want to display on the lcd or is there another method, like if I want to display a variable that changes every second?

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Best Regards

Manuel C. Reinhard

Manuel

Ive been looking through different documents and now my question is.(as no one answered my last question) isn't there a way to write on my parallel lcd, that lets me write all the text at the same time, like in a serial lcd?

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Best Regards

Manuel C. Reinhard

Mike Green

If you have a Stamp with the parallel LCD commands (like the BS2p), then you can write all the text with one statement similar to the serial LCD with some minor changes to accommodate differences between the serial and parallel LCD commands. If you don't have the built-in LCD commands, you need more complex programming. There is a good article in Nuts and Volts that's archived on the Parallax website that shows how to do this.

RGuyser

manuel. I just asked the same question in the basic stamp forum, to mixed results.. i got some snotty remarks, which wasnt fair!

i think it turns out that you use the data command to load info into the eeprom because the stamp 2(for instance) only has 16 bytes of variable ram.allso, be carefull - dont give the screen more than 5volts. i found out the hard way that LCDs are absurdly efficient and can be powered off a BS2 pin, even!

i kept asking why a little routine couldnt load strings in and out just as easily, and couldnt get a usefull response. i also asked if there was code to make it easy to do these things...

i have an application where a user should be able to use a 11-key matrix to enter a number... i want each number to appear as it is typed... no idea how to do this yet.

it may mean putting a bunch of strings into the eeprom, then using their memory location to call them out.. so a subroutine would be supplied with an eeprom location and a string length, and do the rest... i will probably have this code working in the next day or so, and can share it...

good luck,

robert

Manuel

hey, thx for the replies. I actually have a bs2p, but i won't be willing to use it, because it is a little bit more expensive than using a bs2sx oem module. I am trying to make a device capable of meassuring the speed in a machine. i had alredy done that with my bs2sx, a serial lcd and the hall effect sensor. now to make costs even lower i want to use a parallel lcd. the reason for this is that i might be selling these to an industry and if things go well i might do about ten units. I think that it can be possibly done with the bs2sx, because the serial to parallel unit that the parallax serial lcd uses has an sx ch

Manuel

i will try to find the article also, lol.

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Best Regards

Manuel C. Reinhard

Manuel

I luv nuts and volts, no question it was the best thing to do with $20, get a suscription. I just found that, althoug I lose time with it, there are some serial to parallel ICs that parallax sells to make my job easier. I think ill try the 74HC chips to make my work easier.

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Best Regards

Manuel C. Reinhard

RGuyser

manuel -

try wbay for a parallel to serial IC.. i have seen them for $4.50 plus $3/shipping.

Forrest

Or you could spend another 45 cents and get a really nice serial LCD controller chip here www.phanderson.com/lcd106/lcd107.html

If want a piggyback board to plug the Phanderson controller chip go here www.wulfden.org/k107/

Manuel

For me it wouldnt be 45 cents, as I live in mexico I have to pay shipping and taxes. Commonly I buy the stuff through a corporation of a friend, which makes it easier for me to buy parallax stuff. And as Im still a student, actually I graduated now from highschool, I dont have a lot of money to buy myself a lot of stuff direclty through internet.

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Best Regards

Manuel C. Reinhard