[AVR] Does anyone have experience with RS485 and AVR ?

[bianchi77]

Guys,
Does anyone have experience with RS485 and AVR ?
Do I need RS232 for it ? or RS485 is replacing my RS232 ?

Any references or clues will be appreciated..
Thanks

 

[nandhu015]

You dont need RS232. You have to connect AVR pin to RS485 ic.

 

[bianchi77]

do you have schematic example for it ? I want to use 3.3V RS485

 

[nandhu015]

Check this one

https://www.edaboard.com/threads/306369/

more here

https://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=136873

 

[bianchi77]

can I use MAX485 with 3.3V supply ? thanks

 

[nandhu015]

MAX485's operating voltage is 5V

Search there are lot of others which operate in 3.3V

 

[bianchi77]

I mean, I use 5V as supply but input it with 3.3V MCU....is that possible ? thanks

 

[nandhu015]

I mean, I use 5V as supply but input it with 3.3V MCU....is that possible ? thanks

Yes, possible, with and level converter between mcu and max485

 

[bianchi77]

can I use 74HCT245 as a level converter ?