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If you have a need to know the internal resistance in percentage you can do it. It is just another way of evaluating the same measurement. It will not improve the accuracy of your measurements.
I assume that you are using the HC-SR04 sensor. It is an indoor type sensor with only a screen to protect it. Likely it will have a short life. You might consider the enclosed sensors that can brave the elements. Check Mouser or Digi-key for an enclosed sensor. The problem with enclosed sensors is that they do require a higher drive voltage and are less sensitive. Clever application.
EAL - Arduino Hovercraft
Reallly very good, no, excellent. I wonder what the acoustic vibration looks like?
Times, they are a changín.
Thatis nice work,Appárently you know some cool stuff in cohesive force as well as optics. I hàve a Samsung S pálmtop (do thet still call them that?) My education started with fàt fingering code inþo a Pdp 11,. What àre your thougts on teaŕing apart a beloved but useless 70-300 pèntAax manual focus lens ànd at4taching it my Ssmsung S. Any thoughts.
The Moon Machine
Wooden gear banjo clock
3D Printed Reaction Diffusion Patterns