We print the HEX address of the connected device on the serial monitor. If there is a valid I2C slave we get a 0 by ending the transmission to the slave through Wire.endTransmission(). To begin the transmission to the possible I2C slave we use the Wire.beginTransmission(address) function. To scan all possible I2C HEX addresses we use a for loop. If no address is provided in the function like Wire.begin(address), the device joins as master like we want. With Wire.begin() the microcontroller joins the I2C bus as master or slave. The variable will be increased when we find an I2C device and is therefore the sum of connected I2C devices. After we define some cool printings on the serial monitor, we define a variable count to zero. Than we wait until the serial connection is established that we are able to scan devices. First we define the baud rate to 115200 and we will memorize to set the baud rate of the serial monitor to the same value.

This sketch uses only the setup function, because we want only one time to scan all connected devices.

Therefore this library is essential every time you want to use the I2C communication.

The “Wire.h” library allows the microcontroller to communicate with I2C devices. The transferred data is grouped in packages / messages, made of a header and a payloadĭata is transferred bit by bit along a single wire You can connect multiple salves to a single master You can have multiple masters controlling one or multiple slaves Instead of a clock signal the data steam itself contain start and stop signals 1960 by Gordon Bell at Digital Equipment CorporationĪ clock line is required to synchronize the communication

How to replace arduino wire library