Using Wemos D1, an ultrasonic sensor and Thingio.AI IoT platform.
Step 1: ThingsIO.ai
Just you need to interface your Wemos D1 and ultrasonic sensor as shown in diagram.
Then upload code onto your Wemos D1 and show the output on your desktop.
Link : https://thingsio.ai/
Code is available for you and just you need change your wi-fi ssid and password and also change your product id and slave id as per iot platform.