1602A LCD dosn´t display prrogrammed Data from a PIC16F877A

[Nasim Khaliqhey]

2016-05-17 (2).png

(93.54 KiB) Downloaded 1564 times

2016-05-17 (3).png

(269.92 KiB) Downloaded 1564 times

the 2 above atteched documents shows my programming & wiring of the 1602A LCD & PIC 16 F 877A
looking forward for finding a slution to this prolem

[Benj]

Hello,

The connections look ok to me. Have you tried a 1 second flasher test to confirm the chip is running at the right speed etc on your circuit.

http://www.matrixtsl.com/wiki/index.php ... ED_flasher

[dazz]

Hi
Can you also attach your flowchart here as it's almost impossible to try and guess, what your program is doing
Regards
Dazz

[Nasim Khaliqhey]

dear helper
here I send you the setup icins circuit diagram to find my mistakes if thyer is any.
but as I mentioned befor the crystal I have been ueing is 20MHz
also I have been using the same frequency for the intrupter that I need for this project
thanks alot
Nasim

[medelec35]

Hi Nasim,
You have not set your configuration settings correctly.
select Build, Project options.
In general options tab change

Code: Select all

Clock speed to 20000000Hz

In Configure Tab change:

Code: Select all

Watchdog Timer to Off 
Low Voltage Programming to Disabled
Background Debug to off

Could you please read this post

Martin

[Nasim Khaliqhey]

hey dear Benj Thank you for your technical Informations I did set the informations pionts

But stil I have empty Display
Can you please see the two atteched snapshots I have sent you
the scop shows the Data ok not the 16x2 LCD , in my PCB
If you find time for looking at my post please let me know what to do nex
wr
Nasim

[medelec35]

I can't get your Flowchart to load. can you upload it again please.
What have you got connected to pin1 of 16F877A?
Did you follow Bens useful advice:

Have you tried a 1 second flasher test to confirm the chip is running at the right speed etc on your circuit.

http://www.matrixtsl.com/wiki/index.php ... ED_flasher

What are the results from that?

[Nasim Khaliqhey]

Hey Dear Benj
at the begaining of thsi projecj I have set the reset 10K interin 4.6v the switch is set at pin 1 of the IC when it pressed in makes the v =0
should that not be there?
wr
Nasim

[medelec35]

Hi Nasim,

Hey Dear Benj

It's medelec35 (Martin)

at the begaining of thsi projecj I have set the reset 10K interin 4.6v the switch is set at pin 1 of the IC when it pressed in makes the v =0
should that not be there?

The diagram is not clear to me.
Pin one must be connected to +5 v ( or what ever VCC your using) otherwise microcontroller will be in permanent reset state.

You have not attached an updated version of flowchart, so unable to assist any further.

Martin.