I2C - Pull-ups - Two Arduinos

Using Arduino Networking, Protocols, and Devices
1

For communication between two Arduinos (one being Master and the other as Slave):

a) Is it necessary that both Arduinos should share the same VCC?
b) If both Arduinos have separate VCC, to which VCC the pull-up resistors along SDA and SCL should be connected to?

2

a) - NO. Arduinos must share their GND
b) - It does not matter from which Arduino are pullup resistors connected, because Arduinos will have SHARED GND.

You should look to some electronics basics to understand how current flow in circuit.

4

Thanks, both of you for your inputs.

5

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