I2C lcd ( arduino ) with PICBASIC, help

[andybarrett1]

Have a look at this :-

Forgive some of the comments.... Code did help me out :-)

http://www.picbasic.co.uk/forum/showthread.php?t=17302

[iw2fvo]

Thanks Andy for the code,

I am not a good programmer and I would like to convert the PBP program that is normally used now to EASY control the I2C display.
At the moment I am using this piece of code:

INS CON 254 ' $FE: INSTRUCTION COMMAND MODE
CLR CON 1 ' CLEAR LCD , GOTO FIRST LINE, FIRST CHARACTER
DG CON 223 ' DEG SYMBOL °
LINE1 CON 128 ' $80: GOTO LINE 1
LINE2 CON 192 ' $C0: GOTO LINE 2
LINE3 CON 148 ' $94: GOTO LINE 3
LINE4 CON 212 ' $D4: GOTO LINE 4

And then I do the the following to write my own data on it:

LCDOUT INS, LINE2, " V=", DEC2 VLT/10, ".", DEC1 VLT

How could I translate the above in I2C enviroment for displaying ?

Thanks for the assistance
Regards,
Ambrogio
IW2FVO

[EarlyBird2]

This does not look straight forward to use. How for have you got? Have you found its address for example?

[iw2fvo]

Steve,
the address is 0x20.
Thanks
Ambrogio

[EarlyBird2]

Do you need any more help?

[EarlyBird2]

INS CON 254 ' $FE: INSTRUCTION COMMAND MODE
CLR CON 1 ' CLEAR LCD , GOTO FIRST LINE, FIRST CHARACTER
DG CON 223 ' DEG SYMBOL °
LINE1 CON 128 ' $80: GOTO LINE 1
LINE2 CON 192 ' $C0: GOTO LINE 2
LINE3 CON 148 ' $94: GOTO LINE 3
LINE4 CON 212 ' $D4: GOTO LINE 4

Assuming $80 is line 1/0 then we can add

PAUSE 2 ; Let command finish
LCD_Data = $80
gosub LCD_Write_

to position the cursor. As this is a command it goes before we switch to data mode like this

PAUSE 2 ; Let command finish
LCD_Data = $80
gosub LCD_Write_
PAUSE 2 ; Let command finish
LCD_RS = 1 ' this is data
goto main

[iw2fvo]

Dear Steve,

I am not able to findout the detailed spec for the QC2004A display. I can tell it is working well using the standard PBP connection diagram.
I am posting a general spec for LCD addressing ( attached ).

I did a very bad experience with the PCF expander board that was attached to the LCD: the trim pot that should adjust the contrast of the display has the cursor connected to ground and one side connected to 5VDC. I did turn it just to be sure of the contrast setting and I got a short circuit of the 5Vdc to ground when turned fully clockwise. The result is that my ICD2 programmer smoked and it is no longer working. I have attached the photo of the PCF expander to warn about this item: there is a very very gross design error on it.
I am looking to find a new pic programmer to buy: what do you recommand to me ? Is the pickit3 really good ?
I have a pic16f877 to replace on the ICD2 programmer but I do not have any possibiliity to program it with the required bootloader... I will ask someone tomorrow !
I really hope to test your programs soon. I will let you know.
I want to thank you once again for the help you are giving to me .
Regards,
Ambrogio

[EarlyBird2]

Ambrogio

I am looking to find a new pic programmer to buy: what do you recommend to me ? Is the pickit3 really good ?

I have no experience of programmers as I inherited all of my hardware from my son, he took an electronics course before going to university. I have a Picstart Plus that I have never used.

I really hope to test your programs soon. I will let you know.

Please do as you have sparked my interest now and all sorts of bright ideas are formulating in my mind to the point that I am loosing sleep.

[richard]

I have a pickit3 and a pickit2 programmer the pk3 only ever gets used if its the only choice (and it very seldom is) . the gui for the pk2 is just so much better to use . serial debugging is just so easy with the pk2 and its built in comms package . by far the pk2 is my tool of choice for icsp.
I have never bothered to use either of them in command line mode for programming directly from micro code studio although it is fairly easy to do .
I must admit that I have not looked to see if microchip have made a better/upgraded gui for the pk3 for at least a year now , my info may be out of date .
I also wonder if any body has tried the cheap pk2 clones that are on ebay , are they compatible with the microchip pk2 gui ? are they any good?

[iw2fvo]

Is there a lista of PICs programmable by PICKIT2 ?
Thanks
Ambrogio

[EarlyBird2]

I am not a good programmer and I would like to convert the PBP program that is normally used now to EASY control the I2C display.
At the moment I am using this piece of code:

INS CON 254 ' $FE: INSTRUCTION COMMAND MODE
CLR CON 1 ' CLEAR LCD , GOTO FIRST LINE, FIRST CHARACTER
DG CON 223 ' DEG SYMBOL °
LINE1 CON 128 ' $80: GOTO LINE 1
LINE2 CON 192 ' $C0: GOTO LINE 2
LINE3 CON 148 ' $94: GOTO LINE 3
LINE4 CON 212 ' $D4: GOTO LINE 4

And then I do the the following to write my own data on it:

LCDOUT INS, LINE2, " V=", DEC2 VLT/10, ".", DEC1 VLT

How could I translate the above in I2C enviroment for displaying ?

Thanks for the assistance
Regards,
Ambrogio
IW2FVO

How to do this as neatly as possible are the next steps.

[iw2fvo]

Steve,
it is a very good new !
I am looking to place an order for a couple of new extender boards. The point is the lead time .
I will let you know.
I appreciate your assistance.
Regards,
Ambrogio

[EarlyBird2]

Steve,
it is a very good new !
I am looking to place an order for a couple of new extender boards. The point is the lead time .
I will let you know.
I appreciate your assistance.
Regards,
Ambrogio

No next day delivery in Italy?

I ordered my LCD and backpack for £9.30 including next day delivery, details in #66.

The test program is not very useful as it only tests the LCD is working. I will add commands so that the screen can be cleared and the cursor can be positioned anywhere on the screen.