Hardware Overview - SparkFun Ultrasonic Distance Sensor - TCT40 (Qwiic) Hookup Guide Note the special function needed to change the addr; also see SparkFun Ultrasonic Distance Sensor fails to compile - #7 by jimk123 and determine what library version is being used
Are you using this example? It has some notes/comments about maybe needing to use example 2 first if the address is 0x00. You should be able to tell which sensor version you have like it said; is there an R on the board? If not, 0x00…if so, it should be 0x2F, as Ali said
