Automatic Water Level Controller With Error Indicator Alarm is an electronics project which I have done recently. Here is the brief description / abstract of it. The Water Level Controller with Error Indicator employs a simple mechanism to detect and maintain the water level in a tank or any other container by switches on/off the motor automatically when needed. The level sensing is done by a set of nine probes which are placed at nine different levels on the tank walls (with probe9 to probe1 placed in increasing order of height, common probe (i.e. a supply carrying probe) is placed at the base of the tank). Basically, level9 represents the “tank full” condition while level 1 represents the “tank empty” condition.