We have a very cost-effective Ultrasonic Ranging Module :HC-SR04, but it need you to trigger the ranging and calculated the distance yourself.
Here is a more easy use serial ultrasonic module JSME007TX. It will auto output the distance information via serial port after power on, you don't need to do any trigger and calculated, just need to read the serial pin and get the distance information.


Specifications:
Output frame format (4Bytes)
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