You might think that water level sensor has nothing to do in your daily life, as you don’t even need this stuff at all! Well, please don’t reject it so quickly, as everything has its own value to us!
Ok, no matter you need this thing or not, you’ve nothing to lose by read on this article, right? For your information, this project has three main parts: The capacitance probe, the analog electronics unit and the digital electronics unit.
The capacitance probe can be created by using some insulated wire, where the insulation will be dielectric of a cylindrical capacitor with the inner conductor as one plate. To be honest, the probe is not suitable for distilled or clearly pure water, as it’s not conductive enough to handle it! However, it works well in relatively clean water, such as rainwater from the roof runoff into a plastic tank.
Furthermore, light springs can also be applied at the top of the probe, which it’s to maintain wire tension. You have to ensure there are no any sharp edges at the bottom of the U.
Remember that the probe need to be attached to something fixed, such as the side or top of a water tank. If you didn’t do it properly, it won’t function very well!