Wire.beginTransmission(0x68); // Talk to device at address 0x68 Wire.write(0x00); // Tell it to look at register 0 Wire.endTransmission(); // Let go of the line
Mastering the Art of I2C Communication with Arduino's Wire.h Library arduino wire.h library
The Wire.h library is not the fastest I2C library. It is not the most feature-rich. It doesn't support some of the advanced I2C modes (like multi-master arbitration) easily. Imagine a conversation where you (the Master) are
Imagine a conversation where you (the Master) are asking a question, but you have to manually move your jaw to simulate the other person speaking. The Master generates the clock pulses to keep time, but it releases control of the data line so the slave can talk back. It allows your Arduino to communicate with multiple
Wire.h is the standard Arduino library that implements the (also referred to as Two-Wire Interface or TWI). It allows your Arduino to communicate with multiple slave devices—like temperature sensors, OLED screens, or real-time clocks—using only two pins:
On most Arduino boards (Uno, Nano, Mega), SDA is on and SCL is on A5 . On newer boards like the Zero or MKR series, dedicated pins exist.