this is signal graph https://drive.google.com/open?id=1RL3-6gSHURQO02v4HPX6I1Wf2IVCtG08
First, (last file), I couldn't understand why the current is flowing through side but direction of movement is another way.
Second, I can understand the oscilloscope graph (third file) first one but at second one, why graph is like that?
and want to know direction. does Ultrasonic is going to the way that same direction of pulse current or another way???
Pulse signal is 500KHz and generated by arduino uno. First and second picture is pzt in third picture.