Arduino to Arduino i2c not visible, but visible sensors LCD etc

Using Arduino Programming Questions
#1

Hi everyone.

I'm able to get my i2c scanner to pick up sensors and screens, but not other Arduino. Mainly Uno to Uno. I feel like I'm missing something obvious here, followed guides online but still not having any success.

Any advice please :slight_smile:

#2

Can you show the sketch of the Slave ?
Did you connect both GND ?

#3

Post a schematic not a frizzy thing, that will help us resolve your problem. Show all hardware and post links to technical information on them.