Dummy needs LCD tutorial,

[TK5EP]

Hi All,

I start with PICs and have some problems regarding LCD display.

For a 628, i wrote some lines of code to read a frequency in PORTA.4 and display the result after applying a formula.
The format of the displayed datas is like 0 km/h to 180 km/h

When the data displayed is for ex. 120 km/h and the next one 10 km/h i have the remaining m/h of the first data still displayed , so i have 10 km/h h displayed.

Do i have to clear the LCd before each display or format the data to have the same length to avoid this problem ?

Also, if i want to display a small cursor ( like || ) that would move on the line like a bargraph, how can i create and display this ?

Is there a tutorial about LCDs somewhere ? I didn't find it.

Greetings from Corsica, Patrick.

[Luciano]

When the data displayed is for ex. 120 km/h and the next one 10 km/h .

Good brakes or wall?

If you clear the LCD you will have a flickering LCD.

For the bargraph just print the ASCII value 255 on the second line of the LCD.
Will be like that █ █ █ █ █ █.



Luciano

[Melanie]

When displaying your km/h data, suffix it with one or two ASCII spaces ($20 Decimal 32). This will overwrite any characters remaining from the end of the prvious display.

It's neater to RIGHT JUSTIFY numeric displays, this saves the km/h waving about along the right-hand side of the numeric value which becomes a distraction... this probably will look a lot more professional...

LCDOUT $FE,$80
If kmh<100 then LCDOUT " "
If kmh<10 then LCDOUT " "
LCDOUT #kmh," km/h" ' note no trailing spaces required

rather than this, which despite being simpler code, ends up looking tatty...

LCDOUT $FE,$80,#kmh," km/h  " ' note the couple of trailing spaces here

[Acetronics2]

Hi, Patrick

I Committed something about bargraphs, some years ago, I do not know where it was coming from ( Parallax, may be ...)

Here is a listing to show ...

Alain

[TK5EP]

Hi Melanie and Luciano,

Nor good brakes or wall, simply wanting to display wind speed coming from an anemometer.
I understand that i have to format the data so it overwrites the previous one.
Melanie, no difference in your code if kmh<100 or kmh<10 ?

What about displaying a moving cursor about half the wide of a full black character (ASCII 255 as you mentionend)

I want to display the wind speed in full character in km/h and/or a sliding narrow cursor one the second line under a scale on the 1st one.

Melanie, is there a tutorial or an good explanation about the LCD display ?

Thanks for your help.

[Melanie]

No tutorial - just program, play and learn from doing.

Assuming you'll never exceed 255 km/h wind speed (byte variable) and you don't live in Louisianna...

My example right-justified... so the maximum you can display is three characters (100-255 km/h).

If your spped is less than 100 km/h, then you prefix with one blank... this covers 10-99 km/h.

If your speed is less than 10km/h, then you need to prefix with two blanks (0-9 km/h).

Using this method, you get a stationary "km/h" label with the digits moving to the left. A lot neater than digits moving to the right with the "km/h" label flapping about behind them.

[TK5EP]

Well, in Louisinia my anemometer would be broken. It's limited to 180 km/h !

OK, i understand it now. My 2nd question was because i saw no difference between both lines, i think you forgot a space between " " in the line for kmh<10. Do i have it right ?

Thanks for your help, appreciated it.
Patrick.

No tutorial - just program, play and learn from doing.

Assuming you'll never exceed 255 km/h wind speed (byte variable) and you don't live in Louisianna...

My example right-justified... so the maximum you can display is three characters (100-255 km/h).

If your spped is less than 100 km/h, then you prefix with one blank... this covers 10-99 km/h.

If your speed is less than 10km/h, then you need to prefix with two blanks (0-9 km/h).

Using this method, you get a stationary "km/h" label with the digits moving to the left. A lot neater than digits moving to the right with the "km/h" label flapping about behind them.

[TK5EP]

Merci Alain

I'm starting with PICs and it's my first project. I have some good experience in BASIC but have to adapt my knowledges to Picbasic.

I use a demo version (PROTON lite) but i'm thinking to change to Melabs, the forum and support seems to be much better !
Unfortunately, the Melabs demo allows only 35 lines... and the registered version is a bit expensive for an occasional project !
With 35 lines you have to be a bit tricky....

Greetings from sunny Corsica,

[Melanie]

> the (MeLabs) forum and support seems to be much better

Now why do you say that? Just curiosity (though it did bring a smile when I read that). At a glance, they have ten-times the amount of activity that this forum has for roughly the same number of members...

[Acetronics2]

I just forgot it was written for a 16F84 ...

But, in Mel's answer, I didn't see something like :

LCDOUT $FE, $80, ... to place cursor at the beginning of the 1st line, to be sure to overwrite old text ...



Alain

PS: si ça t'intéresse, j'ai les typons pour une petite plaque de démo Kivabien avec un buzzer, trois Leds, 3 E/S , un cavalier de reset ou config et un afficheur LED 2x16...

ça aide ...beaucoup !!!

[CocaColaKid]

For a bar graph go to http://www.picbasic.co.uk/forum/show...LCDbar_INC.bas. Darrel wrote an include file that dones an amazing job using a bar graph.

[enauman]

When displaying your km/h data, suffix it with one or two ASCII spaces ($20 Decimal 32). This will overwrite any characters remaining from the end of the prvious display.

It's neater to RIGHT JUSTIFY numeric displays, this saves the km/h waving about along the right-hand side of the numeric value which becomes a distraction... this probably will look a lot more professional...

LCDOUT $FE,$80
If kmh<100 then LCDOUT " "
If kmh<10 then LCDOUT " "
LCDOUT #kmh," km/h" ' note no trailing spaces required

rather than this, which despite being simpler code, ends up looking tatty...

LCDOUT $FE,$80,#kmh," km/h  " ' note the couple of trailing spaces here

I know this is an old post... But when I try to enter an lcdout statement with a pair of quotes, I get an error saying empty string not allowed. Oh hell, I think I answered my own question. It's because I forgot the space between the quotes... Right?

[crocodilebobbie]

Hi:

I usually find a format for the LCD data which does not change and display that information formated prior to the "loop". That way the display does not flicker. The data that does display is collected and displayed inside the loop, and using pause command to slow down changes.

does that make sense?

bobbie

[davids]

Hello, i need informations i want to use GRAPHIC LCD 128*64 with bar graphs etc but i dont know how i have the pic basic pro compiler and i want to know if i use lcdout it is not compatible for glcd....
whitch are the defines???
simple code???

[Acetronics2]

Hello, i need informations i want to use GRAPHIC LCD 128*64 with bar graphs etc but i dont know how i have the pic basic pro compiler and i want to know if i use lcdout it is not compatible for glcd....
whitch are the defines???
simple code???

I think you didn't understand there's NO support, for the day, for GLCDs with PicBasic Pro ...

May be ... another Basiç ???

Alain