Microcontroller Based Water Level Indicator With Voice Alarm

Microcontroller Based Water Level Indicator With Voice Alarm gives four level indication & Speaks in Hindi language, using IC AT89C2051. This article illustrates the construction and working of a Water level indicator. Such an indicator is used in tanks to indicate the level of liquids and alert us when the tank is full. So by this circuit we can monitor the various levels of the tank and can avoid spillage of water and also we can configure our supplies according to the various levels of tank. Such module or circuit can be installed in big buildings where manual monitor of tanks is difficult and its indicator can be placed at some centralized place.
This circuit works on the principle that water conducts electricity. A wire connected to VCC and four other wires are dipped in tank at different levels namely quarter, half, three-fourth, full and their output are taken on pins P1.0, P1.1, P1.2, P1.3 via a transistor BC547.Also the LED indication of water level ¼, 1/2, 3/4, and Full connecting the port output P1.4, P1.5, P1.6 &P1.7 these LED indicates water level position by glowing indicating LED. Initially when the tank is empty speaker speaks in Hindi language “Tanki Khali” &. As the tank starts filling up wire at different levels get some positive voltage, due to conducting nature of water. This voltage is then fed to their corresponding pins on controller. When level reaches to quarter level, LED displays the message 1/4. On further rise of level, 1/2 and 3/4 are displayed on LED. When tank gets full LED shows the message by indicating. When tank is full speaker speaks in Hindi language "Tanki Bhar gaye".