Help in PIC Networking

[MicroBox]

Greetings everyone!
                   Does anyone knows how to create a Pic Networking(a Master Pic and 3 Pic Slaves), and if possible share the schematic.

Thanks in advance,
Microbox

[bbarney]

Here's a start for you

[blacknight72]

You can use CAN protocol, it's perfect in networking. Another choices are I2C and SPI network, I think!
Good luck, then.

[waicon]

maybe can use RS485, multi-drop, which can be as long as 1KM, i think.
here is schematic for RS232 to RS485/RS422, http://rapidshare.com/files/323503276/RS232_RS485_ISOLATE.pdf

and ..write your own software protocol  share with us.

[tAhm1D]

Hi MicroBox,
I made one such project with one 16F877A as master and 3 slaves. I used SPI to control these. I'll look up the files and try to post the schematic and code if possible.

[BharatSujanani]

Hi MicroBox,
I have done it with I2C. In i2c you have to connect two pin of all controllers together. You have to connect Clock pin of all controllers connected and data pin of all controllers connected.
I have source code for master i2c and slave i2c for PIC. if you require tell me i will upload it on the forum.

Bharat

[MicroBox]

Hi Bharat,
            Please do send the source and schematic, I appreciate it very much...



regards,
MicroBox

[Cain]

S.N.A.P is another option...

http://www.hth.com/snap/

Cain

[medik]

Hi MicroBox,
I have done it with I2C. In i2c you have to connect two pin of all controllers together. You have to connect Clock pin of all controllers connected and data pin of all controllers connected.
I have source code for master i2c and slave i2c for PIC. if you require tell me i will upload it on the forum.

Bharat

I'm also looking at communicating between two PIC in my project. That will be nice if you upload it.

[BharatSujanani]

I am attaching the master and slave i2c files.
And i have not attached schematic because in that only two connections are there, which i have explained in my last post.And connect pull up on both that I2C pins.

[tasosstr]

S.N.A.P is another option...

http://www.hth.com/snap/

Cain

Hello Cain,

Do you have use this protocol ?

I try to convert the sample code to vb.net 2008 without success  :-( do have try ? any help ?

Or do you have understand how the CRC16 working on the vb.net ?

What i was try without success is:

  Private Function Calc_crc()
        Temp_crc = Temp2 * 256
        Crc = Temp_crc Xor Crc
        For Temp1 = 0 To 7
            If Crc > 32767 Then
                Crc = Crc * 2
                Crc = Crc Xor Crcpoly
            Else
                Crc = Crc * 2
            End If
            Crc = Crc And 65535
        Next
        Calc_crc = Crc
        Crc2 = Microsoft.VisualBasic.Left(Hex(Crc), 2)
        Crc1 = Microsoft.VisualBasic.Right(Hex(Crc), 2)

    End Function