#include <Wire.h> // ESP32 allows you to define SDA and SCL pins Wire.begin(SDA, SCL); Teensy boards use an ultra-fast, optimized Wire library. Do not overwrite it with the standard Arduino version. Common Code Examples Using Wire.h Once you have verified or "downloaded" the library, here is a basic master-writer sketch to test I2C communication:
void loop() Wire.beginTransmission(0x68); // Connect to device at address 0x68 (e.g., MPU6050) Wire.write(0x3B); // Send register address Wire.endTransmission(); // Stop transmission
delay(500);
#include <Wire.h> A common knee-jerk reaction for beginners is to immediately search:
If you see "Wire" by Arduino (usually version 1.0 or higher) listed in the results, it is already installed. You do not need to do anything. download wire.h library for arduino
Open the Arduino IDE. Step 2: Navigate to the menu: Sketch > Include Library > Manage Libraries... Step 3: In the search bar, type Wire .
Wire.requestFrom(0x68, 2); // Request 2 bytes from slave device while(Wire.available()) int data = Wire.read(); // Receive a byte Serial.println(data); #include <Wire
If you found this guide helpful, bookmar the official Arduino reference page for Wire.h to learn about advanced functions like setClock() , onReceive() , and onRequest() .