rs485 avr communication with master and slave

shahid.kvmdam

Level: New Member

Joined: Fri. Aug 10, 2018

Posts: 11 View posts

#52

Posted by shahid.kvmdam: Thu. Aug 16, 2018 - 12:33 PM

oooookay ,so can u please advise me make circuit of full duplex and program it

awneil

Level: 10k+ Postman

Joined: Fri. Jul 1, 2005

Posts: 19820 View posts

Location: Basingstoke, Hampshire, UK

#53

Posted by awneil: Thu. Aug 16, 2018 - 01:10 PM

https://www.avrfreaks.net/forum/rs485-full-duplex-mode-using-max485-and-programming-atmega8

Top Tips:

How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
"Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...

Brian Fairchild

Level: Raving Lunatic

Joined: Thu. Oct 18, 2001

Posts: 5079 View posts

Location: Eastern England.

#54

Posted by Brian Fairchild: Thu. Aug 16, 2018 - 01:15 PM

shahid.kvmdam wrote:

oooookay ,so can u please advise me make circuit of full duplex and program it

Send me your email address and I'll email over my hourly rate for contract development work. Payment will be 50% up front; 25% on delivery of working code and 25% on delivery of full documentation. My preferred payment method is Paypal.

#1 Hardware Problem? https://www.avrfreaks.net/forum/...

#2 Hardware Problem? Read AVR042.

#3 All grounds are not created equal

#4 Have you proved your chip is running at xxMHz?

#5 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand."