Arduino Coding - Trying Ultrasonic

My first experiment using the ultrasonic, didn't actually go that well...

Admittedly, it could be my fault but I followed the directions to a T, crossed my t's and dotted my i's etc. 

I followed the tutorial from this website: https://howtomechatronics.com/tutorials/arduino/ultrasonic-sensor-hc-sr04/

But this happened:

In the video, as you can see, I ended up removing the black cable and it seemed to work or at least respond...ish. This example didn't really help with my understanding nor did it help with my A1 assessment. 



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