void loop() | Function | Description | Example | |----------|-------------|---------| | Wire.begin() | Initialize as master | Wire.begin() | | Wire.begin(address) | Initialize as slave | Wire.begin(0x08) | | Wire.beginTransmission(addr) | Start transmission | Wire.beginTransmission(0x3C) | | Wire.write(data) | Queue data to send | Wire.write(0xFF) | | Wire.endTransmission() | Send queued data | Wire.endTransmission() | | Wire.requestFrom(addr, bytes) | Request data from slave | Wire.requestFrom(0x3C, 6) | | Wire.available() | Check available bytes | if(Wire.available()) | | Wire.read() | Read a byte | byte b = Wire.read() | Complete Example: Scanning for I2C Devices #include <Wire.h> void setup() Wire.begin(); Serial.begin(9600); Serial.println("I2C Scanner");
void loop() Wire.beginTransmission(0x3C); // Start transmission to device address 0x3C Wire.write(0x00); // Send command byte Wire.write(0x01); // Send data byte Wire.endTransmission(); // Stop transmission wire.h library
delay(1000);
for(address = 1; address < 127; address++) Wire.beginTransmission(address); error = Wire.endTransmission(); void loop() | Function | Description | Example