Hello everybody, a nice day from Belgium.
I'm using an arduino uno, a led display (2*16) a flat cable (2m) and a HC-SR04 to make some measures.
After some calibrations on the livingroom's table, I had good accuracy between 0.20 and 3.0 meters.
If I install all the things in the well (above water level ) I have always the same (changing from 110 to 130 cm) measures, even if I lift the sensor up and down.
It's an old well digged in 1870, actualy the water level underground is 180 cm, walls are made of corroded bricks and the diameter is 80 cm.
Well, do you think it is possible that the walls are reflecting the sound ?
Did you experience this problem already ?
What is the angle of utra sonic sound diffusion ?
Putting the SR04 in a 80 mm pvc pipe reaching the water is an idea.
What do you think about?
Can you, please, have look at this.
Many thanks in advance. I will be happy to read you.