In this article, we would see how to build a device able to read and display in a display the height of the water level in a well or a cistern. Open Source will use a hardware device called Arduino , an ultrasonic sensor to measure the height of water, an LCD display of 16 characters on two lines and a buzzer that will warn us if the level exceeds a certain threshold.

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The project, as we have already mentioned, is composed of several parts. A sonar sensor to be positioned in the upper part of the well (away from the water) which looks down so as to measure the distance between the highest point of the well and the water. Taking a simple difference between the height from the bottom to the sensor and the meter reads we obtain the height of water. At predetermined time intervals the amount of water will be read and displayed. If the level exceeds a threshold triggered an alarm that sounds the buzzer until the levels drop back below the threshold or when you manually turn off the ringer.
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