sensors_event_t a, g, temp; mpu.getEvent(&a, &g, &temp);

&a, &g, &temp);

This line of code is used to read the sensor data from an MPU (Motion Processing Unit) sensor. The MPU sensor can provide data on acceleration, gyroscopic motion, and temperature.

The "sensors_event_t" is a data structure that is used to store the sensor event data. In this case, there are three types of events being read: "a" for acceleration, "g" for gyroscopic motion, and "temp" for temperature.

The "mpu.getEvent()" function is used to retrieve the sensor data. The function takes three arguments, which are pointers to the "sensors_event_t" data structures for acceleration, gyroscopic motion, and temperature.

After this line of code is executed, the "a", "g", and "temp" data structures will contain the latest sensor data from the MPU sensor. This data can then be used for various purposes, such as controlling a robot or monitoring the movement of an object.