pouchito

Hi All,

Please i need your help to write this code:

I am using two PIC16F877A, 1 push buttom and 1 LCD 2*16.

the input of the first PIC is a push buttom,
the first PIC is connected to the second PIC using a Wire later on i will put a transmitter and receiver.

what i m trying to do is that when i press on the push buttom -> a sentence will be written on the LCD whihc is connected on the second PIC.

I need to write the code for the 2 PIC using PICbasic or assembly.

Please help me

Thanks in advcance

ericgibbs

Hi,
May I ask why you want to use to mid range PIC's, one to read a switch and the other to drive an LCD???

One 16F877A would do both jobs quite easily?

If you are using a TX/RX radio link, why not just TX the button push??

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

Nigel Goodwin

You need two (although you don't need 16F877's), because of the radio link.

You need to encode the data transmission.

Everything he needs is covered in my tutorials, in assembler.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

ericgibbs

I was just thinking in terms of simple TX burst when the button was pushed, no data encoding,
likewise at the RX just detect the burst output from the receiver.

EDIT; Unless he wants to TX 'different' messages, he dosn't say, yet.

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

pouchito

Thanks for your help,

I don't mind if i used other than the PIC16F877
but i must use two because i don't have only the push button , this is only a part of my project.

I will check nigel's tutorial, but can you help me to start writing the code pls ?

Nigel Goodwin

You can't just send a burst of carrier - the receiver would be triggered by any click or pop in the atmosphere - data encoding is absolutely essential.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

ericgibbs

hi,
In your first post you said 16F877A and this post 16F877 ??

If you download Nigel's tutorials, I dont think he would mind if you used them
as a learning template, then 'cut/paste' code fragments into your own listing.
There is no point in writing new code when existing proven subroutines can be used.

Keep your code in a modular format, so that you can add tested subroutines.

Goto www.microchip.com and download the free MPLAB IDE V7.xx also get a 16F877? datasheet and application data for that PIC.
The MPLAB has templates for most of the PIC types, use a template as the
framework for your code.

If you attempt to write the code yourself and then post, members are more likely to help you sort it out.

Regards

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

pouchito

I checked the tutorial 13 of Nigel's tutorial (EXCELLENT TUTORIAL )
I will compile the asm code right now TUT12-3T and TUT12-3R and simulate them

But need your help to interface an LCD cz it s a bit hard using the assembly as i see

ericgibbs

hi Nigel,
When I said a 'burst' I was being over simplistic, I would make it a modulated 'burst' of some known duration.

It now appears that the OP has to use two PICs as part of the assignment.

I suspect he requires to transmit different text messages which bursts the burst bubble!

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

pouchito

Please Nigel help me,
in the hardware part of your tutorial you have mentioned that the RA6 of the PIC in the transmitter part must be connected to the RA7 of the receiver part.

In the pic 16f628 the pin 15 is at the same time RA6 and osc2

if i used it i can't include any crystal oscillator !
am i right? pls correct me

Nigel Goodwin

Just use a different pin, and alter the equates accordingly.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

pouchito

Thanks again.

so if i omit the crystal and capacitor (of the closck), the circuit won't work right ?

FACING A PROBLEM, pls help:

I changed the portA.6 to PortA.0 and of course the receiver part also from 7 to 1, added the 4MHZ crystal and the capacitors but the simulation is not working :'(

What i have to modify to make it work ?

Nigel Goodwin

Have you turned off the analogue inputs?.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

pouchito

no, because i don't know how to do it :S

Shax

I know I am gonna get shot down here....

PICBASIC is your friend. So much easier than assembler to learn...
I use Proton Plus, and love it..


SHAX

__________________
====
Shax.
====

A bus station is where a bus stops...
A train station is where a train stops...
On my desk I have a work station...
Nuff Sed!!!