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