Sending data from ATMEGA 328 to esp8266

[kamokazi]

i am using atmega328 in a personalized board and only pin 25 26 are available for serial communication , i will be sending throw them data to esp 8266 here i have some problems
the main problem is when receiving data the data displays as squares , for expl ; sending simple message from atmega "hello from atmega " i am getting squares in serial monitor
note that i i am using pin 25 with 2k resistance cabled with RX (esp) , atmega ground with 3.3 k resistance cabled with ground(esp) and i am getting 5v from arduino (simple cable)

[UKHeliBob]

Welcome to the forum

Do you think that it might help if you posted both sketches ?

[kmin]

@kamokazi

note that i i am using pin 25 with 2k resistance cabled with RX (esp) , atmega ground with 3.3 k resistance cabled with ground(esp) and i am getting 5v from arduino (simple cable)

...and a wiring diagram.

You don't need any "resistance cables".

[sterretje]

@kmin

You don't need any "resistance cables".

I think that OP is describing a voltage divider for 328 Tx to ESP8266 Rx

[kmin]

@sterretje

think that OP is describing a voltage divider

I'm less confident with that, we'll know if OP presents his wiring.

[johnerrington]

@kamokazi

when receiving data the data displays as squares

I'd guess that is an incompatibility with the formatting or data rate.
It would help if you provided a diagram of your connection

How to make a schematic you can post.

When you submit a question on the forum you will usually need to add a schematic (circuit diagram). The tutorial that follows will explain some ways to create a useful image; however lets start by explaining how to add the image to your post. Its easy. Having created the image all you need to do is : Save the image somewhere convenient - maybe your desktop Start your post, and place the cursor (insertion point) where you want the image to be shown; [upload image to forum] 3: click th…

and the code you are using