https://tinyurl.com/y7ydnvyu : This code will show the distance in cm from the car to an object and then display that range on the Microbit screen and on the cell phone app display. The problem is that the display on the Microbit interferes with the motor command/control so for quick response you should leave the "show number- sonar sensor unit cm " out of the code. You can still leave the show on device code in place. Using the bluetooth app called BST M_Bit with V2 Microbit.