quesion for Serial communication

Projects Programming
1

Hi, guys, I am doing a line following robot project and recently I replaced my Uno by a Mega board but I found the line following module wont work anymore.
This is the link for my line following module:
https://www.sunfounder.com/wiki/index.php?title=Line_Follower_Module

The wiring and program are not changed but when a Mega board is used, I can only receive 0 as the sensor value. So do I need to change the address of LF module or any other code?

2

On a mega the I2C pins are not A4 and A5 but 20 and 21 :wink:

3

Arduino R3 version UNO, Mega ... have redundant I2C pins on the same place next to the AREF pin (leftmost pins on upper header). They are labeled on bottom side.

4

Thanks guys! problem fixed!