PIC to LCD wiring problem ?

[pasanlaksiri]

Please hold patience

please send a detail of what pins you have connected for the 10 wire cable clearly indicating cross connections of the pin numbers of 16 pin LCD display .

let us see, afterall the site gave so many photos to make me atleast feel that genuine effort was there.
Take little more pains

PIC Pins / LCD Pins
RB0 - 11 (D4)
RB1 - 12 (D5)
RB2 - 13 (D6)
RB3 - 14 (D7)
RB4 - 04 (RS)
RB5 - 06 (E)
- 05 (R/W) ( Ground )
- 01 ( Ground )
- 02 ( Vcc )
- 03 ( Vo ) ( i use 20K Preset here )

 

[pasanlaksiri]

PS I downloaded you .asm file, what did you edit it with? It's unreadable.

.

Here is the original files. There is lots of jal files in it

 

[mvs sarma]

PIC Pins / LCD Pins
RB0 - 11 (D4)
RB1 - 12 (D5)
RB2 - 13 (D6)
RB3 - 14 (D7)
RB4 - 04 (RS)
RB5 - 06 (E)
- 05 (R/W) ( Ground )
- 01 ( Ground )
- 02 ( Vcc )
- 03 ( Vo ) ( i use 20K Preset here )

Connect buffered RC2(PIC-17) (that is resistor R7 at pin 10 of the pcb connctor JP1.) to pin 16 of the LCD

then youmay maintain 1V DC approx on pin3 ( contrast) some where beteen 0.9 to 1.2 the display will be clear.
All the best

 

[mvs sarma]

.................

PS I downloaded you .asm file, what did you edit it with? It's unreadable.

......................

Hi Bill,
Try reading the .asm or .jal files with winXP "Wordpad" they open up neatly

 

[pasanlaksiri]

Connect buffered RC2(PIC-17) (that is resistor R7 at pin 10 of the pcb connctor JP1.) to pin 16 of the LCD

then youmay maintain 1V DC approx on pin3 ( contrast) some where beteen 0.9 to 1.2 the display will be clear.
All the best

THX but my prob is I can program the chip. Its always fail to verify.

 

[mvs sarma]

you have the HEX file and it should load

as yopu are using the MultiPIC prog,let me veify--the settings with winpic800- there is a latest ver 1.62

BTW, are you sure that the Vpp is proper at above 12.5V or as perscribed in F877 datasheet for programming?
If needed try replacing the electrolytics to 220:mu: F

whether your PC is suppoeting the proper voltages? i shall be back with you

don't worry

 

[mvs sarma]

Hi Pasan, please see the site below and some of the comments are extracted from there and pasted here. perhaps you have to use winpic or winpic800 for programming f877 where as f877A is programmable by ic-prog.

**broken link removed**


PIC16F870(8),PIC16F871(8),PIC16F872,PIC16F873,PIC16F874(4),PIC16F876(5),PIC16F877(5)

PIC16F873A(5),PIC16F874A(5),PIC16F876A,PIC16F877A


(5) IC-Prog cannot program/verify/erase these devices with Multi PIC Programmer 5V2. Please use WinPic.

 

[pasanlaksiri]

Hi Pasan, please see the site below and some of the comments are extracted from there and pasted here. perhaps you have to use winpic or winpic800 for programming f877 where as f877A is programmable by ic-prog.

**broken link removed**


PIC16F870(8),PIC16F871(8),PIC16F872,PIC16F873,PIC16F874(4),PIC16F876(5),PIC16F877(5)

PIC16F873A(5),PIC16F874A(5),PIC16F876A,PIC16F877A


(5) IC-Prog cannot program/verify/erase these devices with Multi PIC Programmer 5V2. Please use WinPic.

Hi

Im trying to Program PIC16F877A

But I program same chip b4 properly using multi Pic 5V2

 

[mvs sarma]

Hi Pasan,
I did very minor changes and I was able to compile the file . a set of files is zipped and attached here. now please see whether you can programme it