Ultrasonic Distance Measurement Function

This is a function that calculates the distance using an ultrasonic sensor. The function starts by checking if a trigger signal has been received. If so, it sends a high pulse to the sensor for a short period of time and waits for the echo signal. Once the echo signal is received, the function calculates the time it took for the signal to travel to the object and back, and converts it to a distance value using a conversion factor. The function also applies a correction factor to the distance value to account for any errors in the measurement. Finally, the function resets the timer and returns the distance value.