help with pic16f877a existing project

[loonster]

have any1 tested
https://www.electro-tech-online.com/threads/pic16f877a-lcd-keypad-interface.118819/

this???

i'm actually working on a project about the same with this n it works perfectly on protheus simulation but not in real life. i tried program it exactly the same without the changes into a pic16f877a on a breadboard but it doesn't work as well. HELP!

 

[Ian Rogers]

What doesn't work? Is the display showing black squares on the top line?

 

[loonster]

the display doesnt show anything at all. i even tried using the original program but still doesnt show anything
the display i'm using is FORDATA - FDCC1602L-FLYYBW-51LR, n i'm very sure the display is fine.

it works during simulation, does this kinda situation happen often?

 

[loonster]

btw thanks for your nigel tutorial, it helps me a lot during my modification of the program n programming pic16f684

 

[Ian Rogers]

What voltage have you got on the contrast pot?

 

[loonster]

i added rheostat n now i have black block on the upper line but not running da program at all

 

[Ian Rogers]

Two things... The LCD isn't initializing so... make sure the pic is running ( to do this... add a toggle to one of the pins and drive an led). If its running... You need to check delays... Most LCD's don't initialize because the signals are too fast..... Have you the same XTAL as in the proteus circuit?

 

[loonster]

i'm using this Frequency:3.579545MHz; Frequency Tolerance:± 50ppm; Load Capacitance:18pF; Frequency Stability:± 50ppm; Operating Temperature Range:-20°C to +70°C; Crystal Mounting Type:Through Hole; Crystal Case Type: , however i just realize in my protheus the OSC2/CLKOUT doesn't on,only OSC1/CLKIN ON, will that affect it??
i'm trying to test the lcd n pic using example from cytron now

 

[Ian Rogers]

FOSC = XT is for @4mhz external Xtal. Add " & FOSC_XT" to your "__CONFIG();"