Arduino Wire.h Library Repack -

void requestEvent() Wire.write("Hello Master");

// Configure sensor (simplified) Wire.beginTransmission(SENSOR_ADDR); Wire.write(0x26); // Control register Wire.write(0xB9); // Active, 128 samples, 2^8mbar max Wire.endTransmission(); delay(100); arduino wire.h library

void setup() Serial.begin(9600); Wire.begin(); // Join I2C bus as master void requestEvent() Wire

if(Wire.available() >= 5) Wire.read()) >> 4; float temperature = temp_raw * 0.0625; void requestEvent() Wire.write("Hello Master")

Serial.print("Pressure: "); Serial.print(pressure); Serial.print(" hPa, Temperature: "); Serial.print(temperature); Serial.println(" C"); delay(1000);

Wire.requestFrom(8, 13); // Request 13 bytes from slave while(Wire.available()) Serial.print((char)Wire.read());

Try the built-in I2C scanner (File → Examples → Wire → Scanner), then hook up a cheap OLED or RTC module. You’ll be amazed at what two wires can do.