ParkingSensor get's in panic mode after 1h43min

[bhaezlr]

I was very interested in the ParkingSensor that I had to build it.

After I build it with also a 3d printed case found in a youtube video (https://www.youtube.com/watch?v=dUmHRy-G-Bg) I discovered that it turns in panic (blinking red leds) mode after 1h43min.
I did several tests and always around 1h43min it failed. Tests done on Arduino Uno and Arduino Nano.

The idea is too good, not to use.
I rewrote the sketch with some adaptations:

• No longer used the newPing library
• Organized some parts in functions
• Use of triggers to calculate distance
• Included hardware limitation of HC-SR04 (4cm - 400cm)