Interfacing with sensors over Inter-Integrated Circuit (I²C)

I²C is a serial communication bus that supports multiple devices on the same line. Devices on the bus use 7-bit addressing. Two lines are needed for the I²C interface: Clock (CLK) and Serial Data (SDA). The master device provides the clock to the bus. The following figure shows a typical architecture of an I²C bus:

Figure 3.3: I²C architecture

The only rule here is that each slave has to have its own unique address on the bus. In other words, two sensors with the same I²C address cannot share a common bus. As defined in the protocol, the master and slaves exchange data over the SDA line. The master sends a command and the addressed slave replies to that command. Now, let’s see an example of I²C communication on ESP32 by implementing a multisensor application.

Developing a multisensor application

The purpose of this example is to develop an application in which we read values from different I²C...