Datasheet

}
void tcaselect(uint8_t i) {
if (i > 7) return;
Wire.beginTransmission(TCAADDR);
Wire.write(1 << i);
Wire.endTransmission();
}
void setup(void)
{
Serial.begin(9600);
Serial.println("HMC5883 Magnetometer Test"); Serial.println("");
/* Initialise the 1st sensor */
tcaselect(2);
if(!mag1.begin())
{
/* There was a problem detecting the HMC5883 ... check your connections */
Serial.println("Ooops, no HMC5883 detected ... Check your wiring!");
while(1);
}
/* Initialise the 2nd sensor */
tcaselect(6);
if(!mag2.begin())
{
/* There was a problem detecting the HMC5883 ... check your connections */
Serial.println("Ooops, no HMC5883 detected ... Check your wiring!");
while(1);
}
/* Display some basic information on this sensor */
tcaselect(2);
displaySensorDetails(&mag1);
tcaselect(6);
displaySensorDetails(&mag2);
}
void loop(void)
{
/* Get a new sensor event */
sensors_event_t event;
tcaselect(2);
mag1.getEvent(&event);
/* Display the results (magnetic vector values are in micro-Tesla (uT)) */
Serial.print("Sensor #1 - ");
© Adafruit Industries
https://learn.adafruit.com/adafruit-tca9548a-1-to-8-i2c-multiplexer-
breakout
Page 18 of 21