How to connect 2 devices on I2C?

[awneil]

I2C is a bus - the whole point of a bus is that it can take multiple things.

On the I2C bus, they just connect in parallel:

I²C

The important thing is that each device must have a distinct address:

How to use two Grove Water Level Sensor with Grove Base Shield V2.0 using I2C

The "Address" on an I2C bus is like the Address you put on a letter - it's how the postman knows where to deliver it. If two houses had the same address, how would the postman know which one should get the letter? And so it is with I2C (and many other buses) - it's how the system knows which device it is talking to. From the table in your post, it seems that this sensor supports two addresses: [image] The documentation for the sensor should tell you how to select which one of those two pos…

The so-called pullup resistors are an important part of I2C:

Newbie I2C Questions

When you have multiple devices all with pullups, those pullups are effectively in parallel - so the effective pullup value is reduced. If all the pullups are the same value: 2 devices will halve the pullup value 3 devices will give you a third of the value etc, etc, ... So 7 devices would give you just one seventh of the pullup value - which is quite likely to be far too low! This picture illustrates the effect of the pullup value: [image]