Hiii! Can somebody help me out. I am trying to get the value from NPK sensor but it is returning 255 for all these N, P and K

[johnerrington]

@vishant021

Connections..
I have common ground for Arduino, RS485 and my powering device
VCC of RS485 connected to 5V Arduino pin
DE to 7
RE to 6
DI to 9
Ro to 8
NPK sensor connection
Yellow wire to A
Green wire to B
Red and black wire to my power supplier

Can you make a schematic of that please??

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…